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617 resultados encontrados para: TEMA: Bosques tropicales
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1.
Libro
Ecology of epiphytes and epiphyte communities in montane rain forests, Colombia / Jan Hendrik Diederik Wolf
Wolf, Jan Hendrik Diederik ;
[The Netherlands] : [University of Amsterdam, Department of Systematics, Evolution and Palaeobiology] , s.f.
Clasificación: 584.09861 / W6
Bibliotecas: San Cristóbal
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SIBE San Cristóbal
ECO010008265 (Disponible)
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2.
Libro
Programa de acción forestal tropical PROAFT
México. Secretaría de Agricultura y Recursos Hidráulicos. Subsecretaría Forestal y de Fauna Silvestre ;
México : Secretaría de Agricultura y Recursos Hidráulicos , s. f
Clasificación: F/634.928 / M4
Bibliotecas: San Cristóbal
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SIBE San Cristóbal
SAF001677 (Disponible)
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3.
- Artículo con arbitraje
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Management strategies, silvopastoral practices and socioecological drivers in traditional livestock systems in tropical dry forests: an integrated analysis
Sánchez Romero, Rosa (autora) ; Balvanera, Patricia (autora) ; Castillo Álvarez, Alicia (autora) ; Mora Ardila, Francisco (autor) ; García Barrios, Luis Enrique (autor) ; González Esquivel, Carlos Ernesto (autor) ;
Disponible en línea
Contenido en: Forest Ecology and Management Volumen 479, artículo número 118506 (January 2021), páginas 1-10 ISSN: 0378-1127
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Resumen en: Inglés |
Resumen en inglés

Understanding traditional livestock management is essential in the design of more sustainable systems, given the forest loss associated to the growing demand for meat. In Latin America, where extensive livestock production is increasing, along with tropical dry forest (TDF) transformation, the role of small holders is critical for designing more sustainable management practices. This study is an integrated socioecological analysis of traditional livestock systems in a region with TDF in Mexico. The objectives were to: a) characterise the historical development and current state of livestock systems and silvopastoral practices, b) define the management strategies and their impacts on forests, and c) identify the regional and local socioecological drivers that influence decision- making processes in livestock and forest management. In-depth interviews were carried out to 32 cattle farmers and analysed using a qualitative-interpretative approach which included multivariate and narrative analyses. Three historical stages (colonization, promotion of livestock and forest conservation) had a strong impact in the development and current state of livestock systems. Access to natural and economic resources and proportion of plant cover (grassland/forest) were essential in defining four groups of management strategies.

The main regional drivers favouring or restricting production include climate, native vegetation, markets and public policies; at the local scale, socioecological factors, such as water availability, native vegetation, economic assets, local knowledge and their interactions determine heterogeneity in management strategies, decision-making processes and their impacts on forests. Adaptive management of livestock and forests in a context of limited economic resources has allowed the conservation of forest areas and the use of silvopastoral practices with local tree species. The integrated socio-ecological approach and the use of mixed methods allowed a better understanding of drivers and their interrelationships, the local knowledge, objectives and perceptions of farmers in the decision-making processes regarding livestock and forest management. Perspectives of farmers on resource use can contribute to the design of more effective and inclusive policies for sustainable livestock systems in the dry tropics.


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Resumen en: Español |
Resumen en español

Here, we use 30 long-term, high-resolution palaeoecological records from Mexico, Central and South America to address two hypotheses regarding possible drivers of resilience in tropical forests as measured in terms of recovery rates from previous disturbances. First, we hypothesize that faster recovery rates are associated with regions of higher biodiversity, as suggested by the insurance hypothesis. And second, that resilience is due to intrinsic abiotic factors that are location specific, thus regions presently displaying resilience in terms of persistence to current climatic disturbances should also show higher recovery rates in the past. To test these hypotheses, we applied a threshold approach to identify past disturbances to forests within each sequence. We then compared the recovery rates to these events with pollen richness before the event. We also compared recovery rates of each site with a measure of present resilience in the region as demonstrated by measuring global vegetation persistence to climatic perturbations using satellite imagery. Preliminary results indeed show a positive relationship between pre-disturbance taxonomic richness and faster recovery rates. However, there is less evidence to support the concept that resilience is intrinsic to a region; patterns of resilience apparent in ecosystems presently are not necessarily conservative through time.


5.
Artículo
PDF
Resumen en: Inglés |
Resumen en inglés

Background: Reliable information about the spatial distribution of aboveground biomass (AGB) in tropical forests is fundamental for climate change mitigation and for maintaining carbon stocks. Recent AGB maps at continental and national scales have shown large uncertainties, particularly in tropical areas with high AGB values. Errors in AGB maps are linked to the quality of plot data used to calibrate remote sensing products, and the ability of radar data to map high AGB forest. Here we suggest an approach to improve the accuracy of AGB maps and test this approach with a case study of the tropical forests of the Yucatan peninsula, where the accuracy of AGB mapping is lower than other forest types in Mexico. To reduce the errors in field data, National Forest Inventory (NFI) plots were corrected to consider small trees. Temporal differences between NFI plots and imagery acquisition were addressed by considering biomass changes over time. To overcome issues related to saturation of radar backscatter, we incorporate radar texture metrics and climate data to improve the accuracy of AGB maps. Finally, we increased the number of sampling plots using biomass estimates derived from LiDAR data to assess if increasing sample size could improve the accuracy of AGB estimates.

Results: Correcting NFI plot data for both small trees and temporal differences between field and remotely sensed measurements reduced the relative error of biomass estimates by 12.2%. Using a machine learning algorithm, Random Forest, with corrected field plot data, backscatter and surface texture from the L‑band synthetic aperture radar (PALSAR) installed on the on the Advanced Land Observing Satellite‑1 (ALOS), and climatic water deficit data improved the accuracy of the maps obtained in this study as compared to previous studies (R²=0.44 vs R²= 0.32). However, using sample plots derived from LiDAR data to increase sample size did not improve accuracy of AGB maps (R²= 0.26). Conclusions: This study reveals that the suggested approach has the potential to improve AGB maps of tropical dry forests and shows predictors of AGB that should be considered in future studies. Our results highlight the importance of using ecological knowledge to correct errors associated with both the plot‑level biomass estimates and the mis‑match between field and remotely sensed data.


6.
Artículo
Mapping disturbance from selective logging in tropical forests of the Yucatan Peninsula, Mexico
Hernández Gómez, Irving Uriel (autor) ; Vázquez Luna, Dinora (autora) ; Cerdán Cabrera, Carlos Roberto (autor) ; Navarro Martínez, María Angélica (autora) ; Ellis, Edward Alan (autor) ;
Disponible en línea
Contenido en: Tropical and Subtropical Agroecosystems Volumen 23, número 1 (2020), páginas 143-152 ISSN: 1870-0462
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Resumen en: Español | Inglés |
Resumen en español

El mapeo de los impactos de la tala selectiva en la Península de Yucatán es importante para lograr la reducción de las emisiones de carbono y los objetivos de conservación de la biodiversidad. Objetivo. Evaluar la efectividad de la aplicación de técnicas de teledetección mediante el uso de imágenes LANDSAT 8 OLI para detectar la perturbación del bosque tropical a partir de la extracción de madera en cuatro bosques con manejo comunitario (ejidos). Además, evaluamos las diferencias entre ellos en términos de implementación de manejo forestal mejorado (IFM) y prácticas de aprovechamiento de impacto reducido (RIL). Metodología. Se calcularon los índices de vegetación y se realizó la clasificación de la cubierta forestal para hacer un mapa de las zonas taladas y no taladas y las perturbaciones específicas del aprovechamiento (por ejemplo, claros por la tala de árboles, carriles de arrastre, caminos forestales y áreas de acopio de madera) en las áreas de corta anual de 2014. Las evaluaciones de precisión se realizaron en función de los puntos de validación colectados en el campo después del aprovechamiento. Resultados. Encontramos que el 75% de las clasificaciones binarias (áreas impactadas y no impactadas) tenían precisiones globales medias superiores al 60%, lo que representa una precisión aceptable (40 a 70%), aunque el mapeo de las perturbaciones específicas de la cosecha tuvo poca precisión (<40%). Los índices de vegetación que obtuvieron los mejores resultados fueron el índice de vegetación de diferencia normalizada (NDVI), Tasseled Cap Greenness y Tasseled Cap Wetness. Los ejidos que aplicaron IFM y RIL impactaron un porcentaje menor de sus áreas de corta y menos área de bosque por metro cúbico de madera extraída, a pesar de intensidades de tala similares o mayores que los ejidos sin prácticas mejoradas.

Implicaciones. El monitoreo del impacto por la tala selectiva es importante para mejorar el manejo forestal y la certificación de sostenibilidad. Conclusiones. El mapeo y el monitoreo de los impactos de la tala selectiva por gestores y técnicos forestales se puede realizar de manera costo-efectiva utilizando imágenes LANDSAT 8, aunque la precisión se puede mejorar con imágenes de alta resolución.

Resumen en inglés

Background. Mapping selective logging impacts on the Yucatan Peninsula is important to pursuing carbon emissions reduction and biodiversity conservation goals. Objective. To evaluate the effectiveness of applying remote sensing techniques using LANDSAT 8 OLI imagery to detect tropical forest disturbance from timber harvesting in four communally managed forests (ejidos). We further assess differences among them in terms of implementing improved forest management (IFM) and reduced impact logging (RIL). Methodology. Vegetation indices were calculated, and forest cover classification was performed to map logged and unlogged forest and specific harvest disturbances (e.g. felling gaps, skid trails, logging roads and log landings) in annual cutting areas of 2014. Accuracy assessments were conducted based on validation points collected in the field after logging. Results. We found that 75% of the binary classifications (logged and unlogged forest) had mean overall accuracies greater than 60%, representing a fair (40 to 70%) accuracy, although mapping of specific harvesting disturbances had poor accuracy (<40%). Vegetation indices that performed the best were normalized vegetation index (NDVI), Tasseled Cap Greenness and Tasseled Cap Wetness. Ejidos that applied IFM and RIL impacted a smaller percentage of their cutting areas and less area of forest per cubic meter of timber extracted, despite similar or higher logging intensities than ejidos without improved practices. Implication. Monitoring selective logging disturbance is important to improved forest management and certification of sustainability. Conclusion. Mapping and monitoring impacts from selective logging by forest managers and technicians can be performed in a cost-efficient manner using LANDSAT 8 images, although accuracy could be improved with higher resolution imagery.


7.
Tesis - Maestría
Bacterias asociadas a árboles tropicales en zonas de recuperación de un disturbio antrópico / Ángel Antonio Becerra Lucio
Becerra Lucio, Ángel Antonio (autor) ; Peña Ramírez, Yuri Jorge Jesús (Director) ; Chávez Bárcenas, Ana Tztzqui (Codirectora) ; Machkour M'Rabet, Salima (Asesora) ;
Lerma, Campeche, México : El Colegio de la Frontera Sur , 2019
Clasificación: TE/579.17097264 / B4
Bibliotecas: Campeche
Cerrar
SIBE Campeche
ECO040006967 (Disponible)
Disponibles para prestamo: 1
Índice

Agradecimientos
Capítulo 1. Introducción
Capítulo 2. Artículo científico
Introducción
Materiales y métodos
Resultados
Discusión
Literatura Citada
Figuras complementarias
Capítulo 3. Conclusiones
Literatura citada


8.
- Artículo con arbitraje
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Carbon storage in a silvopastoral system compared to that in a deciduous dry forest in Michoacán, Mexico
López Santiago, José Germain (autor) ; Casanova Lugo, Fernando (autor) ; Villanueva López, Gilberto (autor) ; Díaz Echeverria, Víctor Francisco (autor) ; Solorio Sánchez, Francisco Javier (autor) ; Martínez Zurimendi, Pablo (autor) ; Aryal, Deb Raj (autor) ; Chay Canul, Alfonso Juventino (autor) ;
Disponible en línea
Contenido en: Agroforestry Systems Vol. 93, no. 1 (Fabruary 2019), p. 199-211 ISSN: 0167-4366
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Resumen en: Inglés |
Resumen en inglés

Livestock production in the tropics contributes significantly to global greenhouse gas emissions, so better understanding the role of silvopastoral systems (SPS) in mitigating such emissions is necessary. The aim of this study was to evaluate the amounts of carbon stored in the biomass and soil organic carbon (SOC) components of a Leucaena leucocephala cum Panicum maximum silvopasture system (SPS) compared to a deciduous tropical forest (DTF), and a grass monoculture (GM) in Michoacán, Mexico. The above- and below-ground biomass were measured by destructive sampling in the SPS and GM, while previously reported allometric equations were used to quantify biomass stocks in the DTF. The SOC concentration up to 30 cm was determined by dry combustion method. The SPS and DTF contained more aboveground biomass (41.8 ± 3.30 and 36.7 ± 5.72 Mg DM ha−¹) compared to GM (8.0 ± 0.76 Mg DM ha−¹). However, the SPS exhibited greater belowground biomass (16.4 ± 1.95 Mg DM ha−¹) than the other systems. The DTF had the highest SOC fraction in all depth classes with values ranging from 3.1 ± 0.07% to 3.7 ± 0.06%, respectively, compared to the other systems. The total carbon stocks in SPS was similar to DTF (120.7 ± 10.97 vs. 120.9 ± 6.38 Mg C ha−¹) but was significantly higher than GM (78.2 ± 8.41 Mg C ha−¹). In dry tropical conditions, SPS displays enormous potential for increasing biomass and soil carbon stocks compared to the GM and can thus be used as a greenhouse gas mitigation strategy in livestock production systems.


9.
Artículo
Combining LiDAR data and airborne imagery of very high resolution to improve aboveground biomass estimates in tropical dry forests
Reyes Palomeque, Gabriela (autora) ; Manuel Dupuy, Juan (autor) ; Johnson, Kristofer D. (autor) ; Castillo Santiago, Miguel Ángel (autor) ; Hernández Stefanoni, José Luis (autor) ;
Disponible en línea
Contenido en: Forestry An International Journal of Forest Research Volume 92, número 5 (October 2019), p. 599–615 ISSN: 1464-3626
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Resumen en: Inglés |
Resumen en inglés

Knowledge of the spatial distribution of aboveground biomass (AGB) is crucial to guide forest conservation and management to maintain carbon stocks. LiDAR has been highly successful for this purpose, but has limited availability. Very-high resolution (<1 m) orthophotos can also be used to estimate AGB because they allow a fine distinction of forest canopy grain. We evaluated the separate and joint performance of orthophotos and LiDAR data to estimate AGB in two types of tropical dry forests in the Yucatan Peninsula. Woody plants were surveyed in twenty 0.1 ha plots in a semideciduous forest at Kaxil Kiuic Biocultural Reserve (RBKK) and 28 plots in a semievergreen forest at Felipe Carrillo Puerto (FCP). We fitted three regression models: one based on LiDAR data, another based on orthophoto variables calculated for forest canopy and canopy opening fractions, and a third model that combined both sets of variables. Variation in AGB was decomposed into LiDAR, orthophotos and joint components using variation-partitioning analyses. In FCP, regression models using LiDAR data only showed higher fit (R2 = 0.82) than orthophoto variables only (R² = 0.70). In contrast, orthophotos had a slightly higher fit (R² = 0.91) than LiDAR (R2 = 0.88) in RBKK, because orthophoto variables characterize very well the horizontal structure of canopies on this site. The model that combined both data sets showed a better fit (R2 = 0.85) only in FCP, which has a more complex forest structure. The largest percentage of AGB variation (88 per cent in RBKK and 67 per cent in FCP) was explained by the joint contribution of LiDAR and orthophotos. We conclude that both LiDAR and orthophotos provide accurate estimation of AGB, but their relative performance varies with forest type and structural complexity. Combining the two sets of variables can further improve the accuracy of AGB estimation, particularly in forests with complex vegeta


10.
Artículo
Conocimiento tradicional medicinal de árboles tropicales y su valor para la restauración de bosques tropicales
García Flores, Juana (autora) ; González Espinosa, Mario (autor) (1950-) ; Lindig Cisneros, Roberto (autor) ; Casas Fernández, Alejandro (autor) ;
Contenido en: Botanical Sciences Vol. 97, no. 3 (2019), p. 336–354 ISSN: 2007-4476
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Resumen en: Español | Inglés |
Resumen en español

Antecedentes. El conocimiento tradicional medicinal (CTM) permite atender necesidades de salud de 80 % de la población mundial y puede servir como guía para recuperar biodiversidad en regiones tropicales, ya que la mayor diversidad de plantas medicinales incluye especies tropicales. Pregunta. ¿Provee el CTM una estrategia para identificar especies arbóreas que por su importancia cultural y ecológica conviene emplear en proyectos de restauración de bosques tropicales? Sitio y fechas . El estudio se realizó en 2015, en cuatro comunidades rurales de la región Sierra de Tabasco, México. Métodos. Con base en revisión bibliográfica se obtuvo un listado de referencia sobre árboles medicinales nativos de la región. Efectuamos entrevistas semiestructuradas y un taller participativo en cada comunidad; se documentaron usos medicinales, enfermedades recurrentes, listados libres de especies medicinales y aquellas con prioridad para emplearse en acciones de restauración. Calculamos índices de riqueza de conocimiento ( IRC ) y de significancia cultural ( ICS ). Resultados. Registramos 45 especies arbóreas medicinales nativas. Las mujeres adultas y ancianas mostraron el mayor CTM. Las principales enfermedades fueron gastrointestinales (93-97 %) y las asociadas a dolores y fiebre (67-97 %), tratadas con 13 y 16 especies, respectivamente. El IRC reflejó un conocimiento promedio menor a 50 %. Gliricidia sepium, Bursera simaruba y Piper auritum tuvieron valores altos de ICS, mientras que Brosimum alicastrum, Ceiba pentandra y Castilla elastica mostraron valores bajos y son consideradas con alta prioridad para la restauración forestal. Conclusiones. El CTM es importante para seleccionar especies arbóreas en la restauración de los bosques tropicales del sureste de México.

Resumen en inglés

Background: Traditional medicinal knowledge (TMK) accounts for attending nearly 80 % of the worldwide needs of health and may guide biodiversity restoration efforts in tropical regions where the greatest diversity of medicinal plants occurs. Questions: Can TMK become a strategy to be used in identifying medicinal tree species, with both cultural and ecological importance, that should be considered in tropical forest restoration actions? Study site and dates: The study was conducted during 2015 in four communities of the Sierra region of southern Tabasco, Mexico. Methods: We obtained from the literature a checklist of medicinal trees native to the study region. We conducted semi-structured interviews and a workshop in each community; we obtained ethnobotanical data about the most common illnesses and the most frequently used plant species for attending them. We identified priority species for forest restoration, and calculated indexes of knowledge richness (IKR) and cultural significance (ICS). Results: We recorded a total of 45 tree species. Adult and elder women showed the highest TMK. The main illnesses detected were gastrointestinal (93-97 %) and those related with pain and fever (67-97 %), which were treated with 13 and 16 species, respectively. On average, the IKR was less than 50 % of all species recorded. Gliricidia sepium, Bursera simaruba and Piper auritum had high ICS values, while Brosimum alicastrum, Ceiba pentandra and Castilla elastica had low values and are considered high priority for forest restoration actions. Conclusions: TMK is important to select tree species in tropical forest restoration actions in southeastern Mexico.


11.
Tesis - Maestría
Resumen en español

El estudio de rizobacterias promotoras de crecimiento vegetal (PGPR) se ha orientado a la interacción de este grupo de bacterias con plantas de interés experimental y agrícola; sin embargo, se conoce poco sobre su efecto en la producción de especies forestales tropicales, como la caoba (Swetenia macrophylla King); cabe mencionar, que esta especie es una de las más utilizadas en lo programas de reforestación con fines de conservación y producción en el sureste mexicano. Su reproducción por lo general se lleva a cabo en viveros y es la calidad de las plantas producidas un factor limitante para el éxito de su establecimiento y sobrevivencia en campo. Se reporta que esta especie presenta lento crecimiento y desarrollo radicular en etapas tempranas de su producción, por lo que en esta investigación se propuso estudiar el efecto de 10 cepas de PGPR en etapas tempranas de desarrollo de caoba. Las cepas de PGPR evaluadas fueron seleccionadas por sus antecedentes de promoción vegetal en especies de interés agrícola y ornamental. El bioensayo se conformó de 10 tratamientos inoculados con cada una cepas bacterianas y un tratamiento control; cada tratamiento contó con 15 plantas en total (5 plantas por repetición) y la duración del experimento fue de tres meses a partir de que se alcanzó el 50% de germinación de las semillas. Las plantas se establecieron bajo el esquema de producción a raíz cubierta, complementándose con una fertilización inicial en ausencia de reguladores de crecimiento, fungicidas y bactericidas. La región 16S del ADNr de las cepas inoculadas se secuenció por el método de Sanger para verificar su identidad y posteriormente su presencia en las raíces se corroboró mediante la secuenciación masiva del 16S del ADNr provenientes de muestras compuesta de dicho tejido.

Los resultados indican que las cepas de PGPR indujeron respuestas distintas en las plantas, principalmente en aumento de biomasa vegetal (expresada en peso seco total); la cepa IPA 47 (Bacillus sp.) presentó un aumento del 39% en la biomasa de hojas, la cepa IPA 38 (B. polyfermenticus) incrementó un 42% en la biomasa de hojas y un 23% tallos, y la cepa IPA 52 (B. siamensis) un 44% en la biomasa de hojas y 30% en la biomasa de raíces. Asimismo, se apreciaron respuestas de sanidad vegetal en los tratamientos inoculados con la IPA 38, IPA 52 e IPA 25 (B. subtilis) debido a que los individuos de los tratamientos no presentaron mortandad. Todas las cepas inoculadas pertenecieron al género Bacillus y su presencia se confirmó en los tratamientos inoculados a excepción del control negativo, donde no se identificaron bacterias de dicho género. Con base en lo anterior, nuestros resultados muestran que algunas cepas de PGPR fueron capaces de inducir incrementos de biomasa aérea y radicular en caoba.

Índice

Dedicatoria y agradecimientos
Índice
Resumen
Capítulo 1. Introducción
1.1 Pregunta de investigación
1.2 Hipótesis
1.3 Objetivo general
1.4 Objetivos particulares
Capítulo 2. Artículo científico
Capítulo 3. Conclusiones
Literatura citada


12.
- Capítulo de libro con arbitraje
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Holocene paleoecology and paleoclimatology of South and Southeastern Mexico: a palynological and geospatial approach
Islebe, Gerald A. (autor) ; Carrillo Bastos, Alicia (autor) ; Aragón Moreno, Alejandro Antonio (autor) ; Valdéz Hernández, Mirna (autor) ; Torrescano Valle, Nuria (autor) ; Cabanillas Terán, Nancy (autora) ;
Disponible en línea
Contenido en: The holocene and anthropocene environmental history of Mexico: a paleoecological approach on Mesoamerica / editors: Nuria Torrescano Valle, Gerald A. Islebe, Priyadarsi D. Roy Cham, Switzerland : Springer International Publishing, 2019 páginas 195-207 ISBN:978-3-030-31718-8
Bibliotecas: Campeche , Chetumal , San Cristóbal
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59784-30 (Disponible)
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SIBE Chetumal
59784-20 (Disponible)
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59784-10 (Disponible)
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Resumen en español

Reconstruction of Holocene paleoecological conditions and paleoclimate of an area with high biological diversity and a variety of climatic conditions like southern and southeastern Mexico is complex. This region is characterized by vegetation types ranging from tropical forest to high mountain vegetation. Additionally, this region was inhabited by the ancient Maya culture, which shaped the landscape for several millennia. Previous paleoecological studies from this region were focused on the Maya culture-environment relationships, to decipher natural and human-induced deforestation. These studies also aimed to understand the effects of climatic regional forcing (El Niño-Southern Oscillation (ENSO), Intertropical Convergence Zone (ITCZ), and North Atlantic Oscillation (NAO) on the natural vegetation. In this chapter we review the paleoecological results and present a new geospatial approach to analyze past precipitation and tropical forest distribution of the Yucatán Peninsula from 1 AD to 1700 AD in 100-year intervals. The geospatial analysis revealed heterogeneity in spatial patterns of precipitation and tropical forest extension during the Late Preclassic, Terminal Classic, and Medieval Warm Period to Little Ice Age transition. The dry periods of the Middle and Late Holocene in the Yucatán Peninsula and southern Mexico can be chronologically placed in the following intervals: 4700–3600 cal year BP, 3400–2500 cal year BP, 2300–2100 cal year BP, 1900–1700 cal year BP, 1400–1300 cal year BP, 730 cal year BP, and 560 cal year BP. We conclude that this region requires additional studies with strong chronological framework due to its heterogeneous environmental conditions.


13.
- Capítulo de libro con arbitraje
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Insights of the movements of the jaguar in the tropical forests of southern Mexico
De la Torre, José Antonio (autor) ; Rivero Hernández, Crysia Marina (autora) ;
Disponible en línea
Contenido en: Movement ecology of neotropical forest mammals: focus on social animals / Rafael Reyna-Hurtado, Colin A. Chapman, editors Switzerland, Suiza : Springer Nature Switzerland AG, 2019 páginas 217-241
Bibliotecas: Campeche
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10933-20 (Disponible)
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Resumen en: Inglés |
Resumen en inglés

Movement is a critical animal behavior which reflects animal response to its current biological needs and to its environment. Comprehending how and why the animals use the available space and the underlying drivers of animal movements is essential to the management and conservation for both species and ecosystems. This chapter aims to understand and describe the movements of the largest felid of the Neotropics, the jaguar (Panthera onca), through different approaches with the purpose to contribute to the existing knowledge of the spatial ecology of this species and to design strong conservation actions for the jaguar in the tropical forest of Central America. We described the movement ecology of jaguars in tropical forests using the information of five individuals fitted with satellite GPS collars in the Greater Lacandona Ecosystem, Chiapas, Mexico. We estimate the home range of jaguars through the autocorrelated kernel density estimation and compare it with different studies implemented throughout the species range. Using the movement-based kernel approach analyzed under the biased random bridge model, we identify the areas that were intensively used and repeatedly visited by the jaguars inside their home range.

The biased random bridge allowed having a more dynamic and realistic approach to describe the space use and habitat selection by jaguars which complement the information about the movements of the species for the region. Finally, we evaluate the movement decisions of jaguars by the step selection function to identify which landscape variables influence the movement behavior of the species in the Greater Lacandona Ecosystem. The development of new movement models and analytical tools have allowed to make more precise inferences regarding the space use and movements of secretive tropical species such as the jaguar which should translate in better conservation strategies to ensure their long-term conservation.


14.
Libro
Movement ecology of neotropical forest mammals: focus on social animals / Rafael Reyna-Hurtado, Colin A. Chapman, editors
Disponible en línea: Movement ecology of neotropical forest mammals: focus on social animals.
Reyna Hurtado, Rafael Ángel (editor) ; Chapman, Colin A. (editor) ;
Geneva, Switzerland : Springer Nature Switzerland AG , 2019
Clasificación: EE/599.098 / M6
Bibliotecas: Campeche
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ECO040006971 (Disponible)
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Índice | Resumen en: Inglés |
Resumen en inglés

This book brings a unique perspective to animal movement studies because all cases came from tropical environments where the great diversity, either biological and structurally (trees, shrubs, vines, epiphytes), presents the animal with several options to fulfill its live requirements. These conditions have forced the evolution of unique movement patterns and ecological strategies. Movement is an essential process in the life of all organisms. Animals move because they are hungry, thirsty, to avoid being eaten, or because they want to find mates. Understanding the causes and consequences of animal movement is not an easy task for behavioural ecologists. Many animals are shy, move in secretive ways and are very sensible to human presence, therefore, studying the movements of mammals in tropical environments present logistical and methodological challenges that have recently started to be solved by ecologist around the world. In this book we are compiling a set of extraordinary cases where researchers have used some of the modern technology and the strongest methodological approaches to understand movement patterns in wild tropical mammals. We hope this book will inspire and encourage young researchers to investigate wild mammal´s movements in some of the amazing tropical environments of the world.

Índice

1 Why Movement Ecology Matters
2 The Impact of Hurricane Otto on Baird’s Tapir Movement in Nicaragua’s Indio Maíz Biological Reserve
3 White-Lipped Peccary Home-Range Size in the Maya Forest of Guatemala and México
4 White-Lipped Peccary Movement and Range in Agricultural Lands of Central Brazil
5 Movements of White-Lipped Peccary in French Guiana
6 Spatial Ecology of a Large and Endangered Tropical Mammal: The White-Lipped Peccary in Darién, Panama
7 Movements of Neotropical Forest Deer: What Do We Know?
8 Daily Traveled Distances by the White-Tailed Deer in Relation to Seasonality and Reproductive Phenology in a Tropical Lowland of Southeastern Mexico
9 Terrestrial Locomotion and Other Adaptive Behaviors in Howler Monkeys (Alouatta pigra) Living in Forest Fragments
10 Variation in Space Use and Social Cohesion Within and Between Four Groups of Woolly Monkeys (Lagothrix lagotricha poeppigii) in Relation to Fruit Availability and Mating Opportunities at the Tiputini Biodiversity Station, Ecuador
11 Home Range and Daily Traveled Distances of Highland Colombian Woolly Monkeys (Lagothrix lagothricha lugens): Comparing Spatial Data from GPS Collars and Direct Follows
12 Ranging Responses to Fruit and Arthropod Availability by a Tufted Capuchin Group (Sapajus apella) in the Colombian Amazon
13 Insights of the Movements of the Jaguar in the Tropical Forests of Southern Mexico
14 Movements and Home Range of Jaguars (Panthera onca) and Mountain Lions (Puma concolor) in a Tropical Dry Forest of Western Mexico
15 Next Moves: The Future of Neotropical Mammal Movement Ecology
Index


15.
- Capítulo de libro con arbitraje
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Next moves: the future of neotropical mammal movement ecology
Reyna Hurtado, Rafael Ángel (autor) ; Chapman, Colin A. (autor) ;
Disponible en línea
Contenido en: Movement ecology of neotropical forest mammals: focus on social animals / Rafael Reyna-Hurtado, Colin A. Chapman, editors Switzerland, Suiza : Springer Nature Switzerland AG, 2019 página 263-267 ISBN:978-3-030-03462-7
Bibliotecas: Campeche
Cerrar
SIBE Campeche
10934-20 (Disponible)
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Resumen en: Inglés |
Resumen en inglés

This book compiles a remarkable array of studies dealing with Neotropical mammal movement patterns and therefore presents a unique opportunity to analyze the state of the art of movement ecology of some of the rarest and secretive species that are top predators, important prey to those predators, and/or critical to maintaining the ecosystem services of the forest ecosystems they inhabit. In this last chapter, we attempt to summarize lessons learned from all chapters and advance the field with respect to our understanding of the causes and consequences of animal movements in tropical forests.


16.
- Artículo con arbitraje
Rebrote arbóreo en la regeneración del bosque tropical de Calakmul, Campeche, México
Haas Ek, María Alejandra (autora) ; González Valdivia, Noel Antonio (autor) ; De Jong, Bernardus Hendricus Jozeph (autor) ; Ochoa Gaona, Susana (autora) ; Aryal, Deb Raj (coaut.) ;
Disponible en línea
Contenido en: Revista de Biologia Tropical Vol. 67, no. 1 (March 2019), p. 164-181 ISSN: 0034-7744
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Resumen en: Español | Inglés |
Resumen en español

Los estudios detallados para comprender como los bosques neotropicales se reestablecen en el tiempo, a través de la sucesión secundaria aún resultan necesarios. Entre los mecanismos de regeneración que actúan en los bosques tropicales, el rebrote de árboles predomina en especies leñosas, con la ventaja de reiniciar el crecimiento de raíces establecidas, que permiten restituir el dosel forestal. El objetivo de este estudio fue identificar y cuantificar las especies arbóreas con capacidad de rebrote en distintas etapas de la sucesión secundaria (barbecho) después del sistema agrícola tradicional de milpa, comparadas con las comunidades del bosque tropical predominante en la Reserva de la Biósfera de Calakmul, y cómo influyen estas especies en la recuperación de la composición de este ecosistema. Se calculó el porcentaje de especies con y sin rebrote para cada etapa sucesional. Se registraron 13 972 individuos (32 % con rebrote y 68 % sin rebrote) y 168 especies (79 % con rebrote y 21 % sin rebrote), el porcentaje de individuos con rebrote va disminuyendo conforme avanza la edad de la sucesión. El número de individuos con rebrote y la composición de especies fueron significativamente diferentes entre etapas. Se puede concluir que la mayoría de especies arbóreas del bosque en Calakmul, presentan la capacidad de rebrotar, lo cual tiene influencia en el rápido proceso sucesional del bosque después de la roza-tumba y quema, restituyendo la cobertura y estructura forestal, así como la composición de las especies originales.

Resumen en inglés

Detailed studies to understand recovering of Neotropical forests over time, through secondary succession, are still necessaries. Between acting mechanisms of regeneration in the tropical forests, the arboreal resprout predominates in woody species, with the advantage of restart the growth from still rooting plants, allowing the restoring of forest canopy. The study aim was to identify and quantify the tree species with resprouting capacity in different stages of secondary succession (tree-fallow) after the traditional milpa agricultural system, compared with tropical forest communities in the Calakmul Biosphere Reserve and, enlightening how these species influences the recovery of the composition of this ecosystem. Was calculated the proportions of species with or without resprouting by successional stage. There were 13972 individuals (32 % resprouting and 68 % not resprouting) and 168 species (79 % resprouting and 21 % not resprouting), the percentage of individuals regrowing decreases as the successional stage progresses. The number of individuals resprouting and species composition were significantly different between successional stages. In conclusion, mostly arboreal species in the region of Calakmul, can regrow, which influences the successional development of the forest after slash-and-burn, helping to restore the coverage, structure, as well as species composition original.


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The role of invasive species in ecosystem functioning represents one of the mainchallenges in ecology.Pteridium aquilinumis a successful cosmopolitan invasive specieswith negative effects on the ecological mechanisms that allow secondary succession. Inthis study, we evaluated the influence of P. aquilinumon secondary succession underdifferent disturbances in a seasonal dry forest of the Yucatán Peninsula. We determined species richness, composition and the relative importance value in four sampling units. Fabaceae followed by Asteraceae, Meliaceae, Rubiaceae, Sapindaceae and Verbenaceaewere the most species rich families. A dissimilarity analysis determined significant differences in beta diversity between sampling units. With a generalized linear model wefound that species richness was best explained by site conditions, followed by calciumand soil organic matter. Also, the generalized linear model showed that abundanceresulted in a strong correlation with site conditions and soil characteristics. Specific soil conditions related to phosphoro and calcium were also detected as beneficiary tothe successional processes. Our results suggest that applying fire restriction and periodiccutting of the bracken fern, this can increase a higher diversity of species.


18.
- Artículo con arbitraje
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Succession and the relationship between vegetation and soil in the Marl Quarries of the Yucatan Peninsula, Mexico
Valdéz Hernández, Mirna (autora) ; Gil Medina, Rossana (autora) ; López Martínez, Jorge Omar (autor) ; Torrescano Valle, Nuria (autora) ; Cabanillas Terán, Nancy (autora) ; Islebe, Gerald A. (autor) ;
Contenido en: Forests Vol. 10, no. 116 (2019), p. 1-13 ISSN: 1999-4907
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19.
- Artículo con arbitraje
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Wet and dry tropical forests show opposite successional pathways in wood density but converge over time
Poorter, Lourens (autor) ; Rozendaal, Danaë M. A. (autora) ; Bongers, Frans (autor) ; Almeida Cortez, Jarcilene Silva (autora) ; Almeyda Zambrano, Angélica María (autora) ; Álvarez, Francisco S. (autor) ; Andrade, José Luis (autor) ; Arreola Villa, Luis Felipe (autor) ; Balvanera, Patricia (autora) ; Becknell, Justin M. (autor) ; Bentos, Tony V. (autor) ; Bhaskar, Radika (autora) ; Boukili, Vanessa (autora) ; Brancalion, Pedro H. S. (autor) ; Broadbent, Eben North (autor) ; César, Ricardo G. (autor) ; Chave, Jerome (autor) ; Chazdon, Robin L. (autor) ; Dalla Colletta, Gabriel (autor) ; Craven, Dylan (autor) ; De Jong, Bernardus Hendricus Jozeph (autor) ; Denslow, Julie Sloan (autora) ; Dent, Daisy H. (autora) ; DeWalt, Saara J. (autora) ; Díaz García, Elisa (autora) ; Dupuy Rada, Juan Manuel (autor) ; Durán, Sandra M. (autora) ; Espírito Santo, Mario M. (autor) ; Fandiño, María C. (autora) ; Fernandes, Geraldo Wilson (autor) ; Finegan, Bryan (autor) ; Granda Moser, Vanessa (autora) ; Hall, Jefferson S. (autor) ; Hernández Stefanoni, José Luis (autor) ; Jakovac, Catarina C. (autora) ; Junqueira, André B. (autor) ; Kennard, Deborah (autra) ; Lebrija Trejos, Edwin (autor) ; Letcher, Susan G. (autora) ; Lohbeck, Madelon (autora) ; López, Omar R. (autor) ; Marín Spiotta, Erika (autora) ; Martínez Ramos, Miguel (autor) ; Martins, Sebastião Venâncio (autor) ; Massoca, Paulo E. S. (autor) ; Meave, Jorge A. (autor) ; Mesquita, Rita C. G (autora) ; Mora Ardila, Francisco (autor) ; Moreno, Vanessa de Souza (autora) ; Müller, Sandra C. (autora) ; Muñoz, Rodrigo (autor) ; Muscarella, Robert (autor) ; Nolasco de Oliveira Neto, Silvio (autor) ; Nunes, Yule R. F. (autor) ; Ochoa Gaona, Susana (autora) ; Paz, Horacio (autor) ; Peña Claros, Marielos (autor) ; Piotto, Daniel (autor) ; Ruíz, Jorge (autor) ; Sanaphre Villanueva, Lucía (autora) ; Sánchez Azofeifa, Gerardo Arturo (autor) ; Schwartz, Naomi B. (autora) ; Steininger, Marc K. (autor) ; Thomas, William Wayt (autor) ; Toledo, Marisol (autora) ; Uriarte, María (autora) ; Utrera, Luis P. (autor) ; van Breugel, Michiel (autor) ; van der Sande, Masha T. (coaut.) ; Van Der Wal, Hans (coaut.) ; Veloso, María D. M. (autora) ; Vester, Henricus F. M. (autor) ; Vieira, Ima Celia G. (autora) ; Villa, Pedro Manuel (autor) ; Williamson, G. Bruce (autor) ; Wright, S. Joseph (autor) ; Zanini, Kátia J. (autora) ; Zimmerman, Jess K. (autor) ; Westoby, Mark (autor) ;
Disponible en línea
Contenido en: Nature Ecology & Evolution Vol. 3, no. 6 (Jun 2019), p. 928–934 ISSN: 2397-334X
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Resumen en: Inglés |
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Tropical forests are converted at an alarming rate for agricultural use and pastureland, but also regrow naturally through secondary succession. For successful forest restoration, it is essential to understand the mechanisms of secondary succession. These mechanisms may vary across forest types, but analyses across broad spatial scales are lacking. Here, we analyse forest recovery using 1,403 plots that differ in age since agricultural abandonment from 50 sites across the Neotropics. We analyse changes in community composition using species-specific stem wood density (WD), which is a key trait for plant growth, survival and forest carbon storage. In wet forest, succession proceeds from low towards high community WD (acquisitive towards conservative trait values), in line with standard successional theory. However, in dry forest, succession proceeds from high towards low community WD (conservative towards acquisitive trait values), probably because high WD reflects drought tolerance in harsh early successional environments. Dry season intensity drives WD recovery by influencing the start and trajectory of succession, resulting in convergence of the community WD over time as vegetation cover builds up. These ecological insights can be used to improve species selection for reforestation. Reforestation species selected to establish a first protective canopy layer should, among other criteria, ideally have a similar WD to the early successional communities that dominate under the prevailing macroclimatic conditions.


20.
- Capítulo de libro con arbitraje
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White-lipped peccary home-range size in the maya forest of Guatemala and México
Moreira Ramírez, José Fernando (autor) ; Reyna Hurtado, Rafael Ángel (autor) ; Hidalgo Mihart, Mircea Gabriel (autor) ; Naranjo Piñera, Eduardo Jorge (autor) (1963-) ; Ribeiro, Milton Cezar (autor) ; García Anleu, Rony (autor) ; McNab, Roan (autor) ; Radachowsky, Jeremy (autor) ; Mérida, Melvin (autor) ; Briceño Méndez, Marcos Alberto (autor) ; Ponce Santizo, Gabriela (autora) ;
Disponible en línea
Contenido en: Movement ecology of neotropical forest mammals: focus on social animals / Rafael Reyna-Hurtado, Colin A. Chapman, editors Switzerland, Suiza : Springer Nature Switzerland AG, 2019 página 21-37 ISBN:978-3-030-03462-7
Bibliotecas: Campeche
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SIBE Campeche
9787-30 (Disponible)
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Resumen en: Inglés |
Resumen en inglés

The white-lipped peccary (Tayassu pecari, Link 1795) is a social ungulate that lives in large groups and performs large movements across tropical forest searching for food and water. White-lipped peccaries are an important food source among rural communities. Nevertheless, excessive hunting has caused the extirpation of this species from several areas in the Neotropics where it was previously common. Throughout its range it is considered vulnerable according to the IUCN Red List of Threatened Species, but the Mesoamerican population has decreased in the last 20 years at alarming rates. Using satellite GPS collars, kernel density estimate (KDE), minimum convex polygon (MCP), and the autocorrelated kernel density estimation (AKDE), we estimated the spatial requirements of four white-lipped peccary groups in three sites with different levels of hunting pressure in the Maya Forest of Guatemala and México. Our results showed that the home range estimated in non-hunted sites were smaller than in hunted sites. The 95% KDE home range for non-hunted areas ranged between 40 and 99 km2, substantially smaller than that of the hunted area at 140 km2. Similarly, the 95% AKDE area estimates for non-hunted sites ranged from 62 to 156 km2, while for the hunted site, the 95% AKDE estimate was 312 km2. In non-hunted sites, dry season home ranges were constrained to the close vicinity of water ponds, whereas during the rainy season white-lipped peccary groups were more mobile.

In contrast, the home range was larger in the hunted site during the dry season compared with rainy season. Our results suggest that hunting pressure in the Maya Forest is probably affecting the behavior and ecology of the peccary group, causing them to move through larger areas with lower group size in hunted areas compared to non-hunted areas. We hope that these results encourage more studies focused on estimating white-lipped peccary home-range size in areas with hunting pressure and human activities.


21.
Tesis - Maestría
Apropiación social de los recursos forestales en el ejido Nuevo Conhuas, región Calakmul, Campeche / Claudia Alicia Hernández López
Hernández López, Claudia Alicia (autora) ; Ochoa Gaona, Susana (Directora) ; Bello Baltazar, Eduardo (Asesor) (1960-) ; Monzón Alvarado, Claudia María (Asesora) ;
Lerma, Campeche, México : El Colegio de la Frontera Sur , 2018
Clasificación: TE/306.097264152 / H4
Bibliotecas: Campeche
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SIBE Campeche
ECO040006861 (Disponible)
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Índice | Resumen en: Español |
Resumen en español

La gestión de los recursos naturales es uno de los problemas socioambientales que enfrenta el mundo. La relación entre sociedad y recursos naturales se vincula con la forma de apropiación del espacio. Con base en el marco teórico-metodológico de la apropiación social, se analizan en los niveles de comunidad agraria y doméstico la apropiación social de los recursos forestales en el ejido Nuevo Conhuas, Calakmul. Se realizaron entrevistas semiestructuradas: a nivel comunidad, 14 a informantes clave y, a nivel doméstico, 24 a unidades familiares. Las técnicas fueron la bola de nieve hasta llegar al punto de saturación, la observación participante y el diario de campo. La interpretación de la información se realizó mediante el análisis inductivo. Se encontró que en Nuevo Conhuas el bosque tropical ha tenido un papel fundamental durante la apropiación social. A nivel comunidad, las políticas de explotación forestal y de colonización del trópico influyeron en la construcción social del territorio, de un grupo maya con cultura forestal se reconfiguró a un grupo social heterogéneo que definió normas sobre el territorio y los recursos forestales. Las políticas de conservación restringen la gestión de los recursos y el desarrollo de actividades productivas. A nivel doméstico, las familias priorizan la agricultura, las prácticas pecuarias bovina, ovina y apícola, y la plantación de naranjal. Las formas de apropiación de estas prácticas productivas mantienen de mayor a menor grado la vegetación boscosa nativa, siendo la práctica de plantación de naranjal la que elimina estos recursos permanentemente.

Índice

Dedicatoria
Agradecimientos
Resumen
Estructura general de la tesis
Capítulo I
1. Introducción
1.1 Contexto regional
2. Objetivos de la investigación
3. Descripción de la zona de estudio
4. Métodos
Capítulo II
2 Apropiación social del territorio y su relación con los recursos forestales desde el nivel comunidad. 2.1 Nuevo Conhuas dentro del contexto de la región de Calakmul: relación entre las categorías subjetiva y la toma de decisiones
2.2 Los recursos naturales y las prácticas productivas en Nuevo Conhuas: reflejo de la categoría concreta
2.2.1 Conocimientos de los recursos naturales presentes en el territorio
2.2.2 Desarrollo de las prácticas productivas en el territorio
2.3 Instituciones establecidas en el ejido para el acceso, uso y control del territorio y de los recursos forestales: relación entre las categorías de normas y abstracta
2.3.1 Organización social del ejido, mecanismos de supervisión y sanciones
2.3.2 Límites para la explotación de los recursos de uso común
2.3.3 Derecho de propiedad y mecanismos de exclusión
2.3.4 Mecanismos de transferencia de derechos de propiedad
2.4 Nuevo Conhuas un sistema complejo: percepciones sobre la comunidad agraria

Capítulo III
3 Apropiación social de los recursos forestales bajo diversas prácticas productivas en la región de Calakmul, Campeche
3.1 Resumen
3.2 Introducción
3.2.1 Contexto regional
3.2.2 Marco teórico-metodológico
3.3 Objetivo
3.4 Materiales y métodos
3.4.1 Descripción de la zona de estudio
3.4.2 Métodos
3.5 Resultados
3.5.1 Contexto social del ejido Nuevo Conhuas
3.5.2 Prácticas productivas en Nuevo Conhuas
3.5.2.1 Apropiación subjetiva de los recursos forestales en función de las prácticas productivas
3.5.2.2 Apropiación concreta de los recursos forestales en función de las prácticas productivas 3.5.2.2.1 Especies y usos de los recursos forestales
3.5.2.2.2 Conocimiento de los recursos forestales
3.5.2.2.3 Manejo de los recursos forestales
3.5.2.3 Apropiación abstracta de los recursos forestales en función de las prácticas productivas
3.6 Discusiones
3.6.1 Relación entre las formas de apropiación de los recursos forestales de las prácticas productivas y la conservación de la vegetación
3.6.2 Perspectivas
3.7 Conclusiones
3.8 Reconocimientos
3.9 Referencias
Capítulo IV
Conclusión
Referencias
Anexos
Anexo 1. Formatos de entrevistas a nivel comunidad agraria
Anexo 2. Formato de entrevista a nivel unidad familiar


22.
- Artículo con arbitraje
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Effects of long-term inter-annual rainfall variation on the dynamics of regenerative communities during the old-field succession of a neotropical dry forest
Martínez Ramos, Miguel ; Balvanera, Patricia (coaut.) ; Arreola Villa, Felipe (coaut.) ; Mora Ardila, Francisco (coaut.) ; Maass, José Manuel (coaut.) ; Maza Villalobos Méndez, Susana (coaut.) ;
Contenido en: Forest Ecology and Management Vol. 426, (October 2018), p. 91-100 ISSN: 0378-1127
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Resumen en: Inglés |
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Effects of long-term rainfall inter-annual variation on regeneration dynamics of tropical dry forests (TDF) are still poorly understood. Such understanding is particularly important to assess the regeneration potential of TDF in landscapes subjected to slash-and-burn farming management. Here, we studied from 2004 to 2016 the effects of inter-annual rainfall variation on the dynamics of regenerative communities of woody species during the old-field succession of a TDF in Western Mexico. Over the study period a severe drought, caused by an El Niño Southern Oscillation (ENSO) event in 2005, and two hurricanes (Jova, 2011, magnitude 2; Patricia, 2015, magnitude 4) were experienced. In 2004, we established a chronosequence of abandoned cattle pastures and old-growth forest sites, which were assigned to four successional categories, each one with three sites: Pasture (0–3 years fallow age), Early (3–5 years), Intermediate (8–12 years), and Old-Growth Forest (without any human disturbance). At each site, seedlings, saplings and resprouts 10–100 cm height of shrub and tree species were tagged, taxonomically identified, measured in height and monitored over 12 continuous year intervals. At each year, all new plants reaching 10 cm height were recorded and considered as recruits. Community rates (recruitment, relative growth rate in height, mortality, species gain and species loss) were calculated per year, considering all plants combined and separating shrub from tree species. All community rates varied notoriously in response to temporal rainfall variability, with almost null interaction with successional category. As expected, mortality and species loss rates declined as the amount of rainfall increased, especially when precipitation of the current and the previous year were taken into account; these rates peaked in the ENSO year and were still high in the following year.

Unexpectedly, recruitment and species gain rates also declined with the increase in rainfall, especially with the amount of rainfall in the current year. Overall, community rates of tree species were more responsive than those of shrub species to temporal rainfall variation. The ENSO-related drought event produced a short and transient instability in the plant density and species density of regenerative communities. However, ENSO effects were smoothed out by subsequent rainy years, leading to a net increase in plant density and species density in all successional categories, especially in the younger one. Overall, our study shows that global (e.g. ENSO) and regional (e.g. storms, hurricanes) climate factors play a key role on forest succession, modulating the speed of the TDF regeneration dynamics. We conclude that low impact agricultural land use and the presence of good levels of remnant forest cover in the landscape confers a high potential for regeneration in abandoned agricultural fields, even under the impact of severe droughts and severe hurricanes.


23.
- Artículo con arbitraje
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Accurate estimates of above ground biomass (AGB) are needed for monitoring carbon in tropical forests. LiDAR data can provide precise AGB estimations because it can capture the horizontal and vertical structure of vegetation. However, the accuracy of AGB estimations from LiDAR is affected by a co-registration error between LiDAR data and field plots resulting in spatial discrepancies between LiDAR and field plot data. Here, we evaluated the impacts of plot location error and plot size on the accuracy of AGB estimations predicted from LiDAR data in two types of tropical dry forests in Yucatán, México. We sampled woody plants of three size classes in 29 nested plots (80 m², 400 m² and 1000 m²) in a semi-deciduous forest (Kiuic) and 28 plots in a semi-evergreen forest (FCP) and estimated AGB using local allometric equations. We calculated several LiDAR metrics from airborne data and used a Monte Carlo simulation approach to assess the influence of plot location errors (2 to 10 m) and plot size on ABG estimations from LiDAR using regression analysis. Our results showed that the precision of AGB estimations improved as plot size increased from 80 m² to 1000 m² (R² = 0.33 to 0.75 and 0.23 to 0.67 for Kiuic and FCP respectively). We also found that increasing GPS location errors resulted in higher AGB estimation errors, especially in the smallest sample plots. In contrast, the largest plots showed consistently lower estimation errors that varied little with plot location error. We conclude that larger plots are less affected by co-registration error and vegetation conditions, highlighting the importance of selecting an appropriate plot size for field forest inventories used for estimating biomass.


24.
Artículo
New records of Orchidaceae Juss. for the state from Hidalgo, Mexico
Hernández Orta, Carlos Alberto (autor) ; Aguilar Dorantes, Karla María (autor) ; Morales Linares, Jonas (autor) ; Bertolini, Vincenzo (coaut.) ;
Contenido en: Check List Vol. 15, no. 5 (2019), p. 827-832 ISSN: 1809-127X
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Two new orchid records are reported for Hidalgo, Notylia barkeri Lindl. and Trichocentrum cosymbephorum (C. Morren) R. Jiménez & Carnevali. The genus Notylia is reported for the first time, and the list of orchid flora is updated to include 110 taxa. Unexpectedly, the species were recorded in abandoned orange plantations rather than natural vegetation, likely because of the high anthropogenic pressure exerted on their natural populations. These new records highlight the importance of continuing to survey regions such as Hidalgo with scarce orchid records, including both natural and modified vegetation.


25.
- Artículo con arbitraje
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Reduced dry season transpiration is coupled with shallow soil water use in tropical montane forest trees
Muñoz Villers, Lyssette Elena ; Holwerda, Friso (coaut.) ; Alvarado Barrientos, María Susana (coaut.) ; Geissert, Daniel R. (coaut.) ; Dawson, Todd E. (coaut.) ;
Contenido en: Oecologia Vol. 188, no. 1 (September 2018), p. 303-317 ISSN: 1432-1939
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Tropical montane cloud forests (TMCF) are ecosystems particularly sensitive to climate change; however, the effects of warmer and drier conditions on TMCF ecohydrology remain poorly understood. To investigate functional responses of TMCF trees to reduced water availability, we conducted a study during the 2014 dry season in the lower altitudinal limit of TMCF in central Veracruz, Mexico. Temporal variations of transpiration, depth of water uptake and tree water sources were examined for three dominant, brevi-deciduous species using micrometeorological, sap flow and soil moisture measurements, in combination with oxygen and hydrogen stable isotope composition of rainfall, tree xylem, soil and stream water. Over the course of the dry season, reductions in crown conductance and transpiration were observed in canopy species (43 and 34%, respectively) and mid-story trees (23 and 8%), as atmospheric demand increased and soil moisture decreased. Canopy species consistently showed more depleted isotope values compared to mid-story trees. However, MixSIAR Bayesian model results showed that the evaporated (enriched) soil water pool was the main source for trees despite reduced soil moisture. Additionally, while increases in tree water uptake from deeper to shallower soil water sources occurred, concomitant decreases in transpiration were observed as the dry season progressed. A larger reduction in deep soil water use was observed for canopy species (from 79 ± 19 to 24 ± 20%) compared to mid-story trees (from 12 ± 17 to 10 ± 12%). The increase in shallower soil water sources may reflect a trade-off between water and nutrient requirements in this forest.


26.
- Artículo con arbitraje
Estructura de la selva alta perennifolia de Nahá, Chiapas, México
Durán Fernández, Alejandro ; Aguirre Rivera, Juan Rogelio (coaut.) (1946-) ; Levy Tacher, Samuel Israel (coaut.) ; De Nova Vázquez, José Arturo (coaut.) ;
Contenido en: Botanical Sciences Vol. 96, no. 2 (2018), p. 218-245 ISSN: 2007-4476
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Resumen en: Español | Inglés |
Resumen en español

Antecedentes: Hasta mediados del siglo pasado se consideraba que la selva alta perennifolia cubría alrededor de 12.8 % de la superficie del territorio mexicano. Actualmente, sólo una pequeña porción de ella ostenta una vegetación boscosa madura ya que en su mayoría es ocupada por terrenos agrícolas, praderas y vegetación secundaria. Uno de los problemas más serios que enfrenta la región Lacandona, es la disminución de su área selvática, como consecuencia de un fuerte proceso de colonización por parte de los pobladores locales, expansión de vías de comunicación, la tala inmoderada y la incorporación de nuevas áreas de selva para aprovechamiento agrícola y pecuario. Pregunta: ¿Cómo es la estructura y composición en los relictos de vegetación madura o mejor conservada de la selva alta perennifolia en la comunidad Lacandona de Nahá? Sitio de estudio y periodo de investigación: Este estudio se realizó en la comunidad Lacandona de Nahá, ubicada al norte, en el municipio de Ocosingo, Chiapas, durante los meses de noviembre de 1993 hasta mayo de 1995. Métodos: Dentro de esta comunidad, se realizaron 25 levantamientos de vegetación en parcelas de 400 m2 cada una (una hectárea en total) en rodales maduros de selva alta perennifolia. Los atributos de la vegetación evaluados fueron: composición florística, densidad, frecuencia, área basal y altura. Se calculó el valor de importancia de las especies en la comunidad y su contribución relativa en los seis estratos reconocidos con ayuda de los informantes lacandones. Resultados: En el área total muestreada se registraron 283 especies de plantas vasculares, pertenecientes a 199 géneros de 84 familias. El análisis de la estructura de la vegetación corroboró la existencia de seis estratos con alturas, una composición florística y formas vitales distintivas.

La densidad en la hectárea estudiada fue de 15,632 individuos y el área basal absoluta de 136.78 m2. El valor de importancia permitió definir de forma adecuada la importancia relativa de las especies en cada estrato, en concordancia con lo observado en el campo. Terminalia amazonia registró el valor de importancia más alto en el estrato arbóreo sobresaliente y en todos los demás estratos. Conclusiones: Se logró describir de forma detalla la composición y estructura de la selva alta perennifolia de Nahá. El apoyo de los informantes lacandones fue fundamental para el reconocimiento tanto de las zonas de selva madura, como de los estratos que la conforman. Existe una relación inversa entre la densidad y el área basal. Se destaca la importancia de evaluar cuantitativamente los relictos de vegetación madura o bien conservada, como referentes indispensables para rehabilitar áreas deterioradas o aplicar medidas correctivas de aprovechamiento de manera fundamentada.

Resumen en inglés

Background: In the middle of last century, it was considered that tropical rainforest covers around 12.8 % of México, but today this area is mainly occupied by agricultural lands, prairies, and secondary vegetation while just a little portion has mature forested vegetation. One of the more serious troubles in the Lacandon region, is the decrease of its rainforest area, because of a hard colonization process, expansion of communication paths, excessive logging, and incorporation of new rainforest areas to the agricultural and livestock production. This study was conducted in the Lacandon Community Nahá, located at the north of the Lacandon rain forest, at the Municipality of Ocosingo, Chiapas, where some areas with mature rain forest are found and the rest is subject to traditional diversified and intensified use. Research question: How are structure and composition in the relicts of mature or well-preserved vegetation in the tropical rainforest of the Lacandon Community Nahá? Study site and period of research: This study was conducted in the Lacandon Community Nahá, located at the north of the Lacandon rain forest, at the Municipality of Ocosingo, Chiapas, from November 1993 to May 1995. Methods: Inside the lands of this community, we conducted 25 vegetation samplings in plots of 400 m2 each (a hectare in total) in mature fragments of the rainforest. The evaluated structural traits were: floristic composition, density, frequency, basal area, and height. We calculated the importance value of the species in the community and its relative contribution in the six forest strata recognized with the help of lacandon informants.

Results: We found 283 species of vascular plants in the total sampled area, belonging to 199 genera and 84 families. The structural analysis of vegetation corroborated the presence of six recognized forest strata, with distinctive height, floristic composition, and life forms. Density in the studied hectare was 15,632 individuals, and the absolute basal area 136.78 m2. The importance value allowed to define the relative importance of the species in each stratum, according to the field observations. Terminalia amazonia records the highest importance value in all the strata. Conclusions: It was possible to describe with detail the tropical rain forest in Nahá. The assistance of lacandon informants was crucial to recognize the zones with mature rainforest and their strata. There is an inverse relationship between density and basal area. The importance to evaluate in a quantitatively way the relicts of mature or well-preserved vegetation is highlighted as an indispensable reference to rehabilitate degraded areas, or to apply corrective actions for adequate advantage.


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Resumen en: Inglés |
Resumen en inglés

Land use change from forests to grazing lands is one of the important sources of greenhouse gas emissions in many parts of the tropics. The objective of this study was to analyze the extent of soil organic carbon (SOC) loss from the conversion of native forests to pasturelands in Mexico. We analyzed 66 sets of published research data with simultaneous measurements of soil organic carbon stocks between native forests and pasturelands in Mexico. We used a generalized linear mixed effect model to evaluate the effect of land use change (forest versus pasture), soil depth, and original native forest types. The model showed that there was a significant reduction in SOC stocks due to the conversion of native forests to pasturelands. The median loss of SOC ranged from 31.6% to 52.0% depending upon the soil depth. The highest loss was observed in tropical mangrove forests followed by highland tropical forests and humid tropical forests. Higher loss was detected in upper soil horizon (0–30 cm) compared to deeper horizons. The emissions of CO2 from SOC loss ranged from 46.7 to 165.5 Mg CO2 eq. ha-¹ depending upon the type of original native forests. In this paper, we also discuss the effect that agroforestry practices such as silvopastoral arrangements and other management practices like rotational grazing, soil erosion control, and soil nutrient management can have in enhancing SOC stocks in tropical grasslands. The results on the degree of carbon loss can have strong implications in adopting appropriate management decisions that recover or retain carbon stocks in biomass and soils of tropical livestock production systems.


28.
- Artículo con arbitraje
Survival and growth of Swietenia macrophylla seedlings from seeds sown into slash and burn fields in Quintana Roo, Mexico
Negreros Castillo, Patricia ; Martínez Salazar, Imelda (coaut.) ; Álvarez Aquino, Claudia (coaut.) ; Navarro Martínez, María Angélica (coaut.) ; Mize, Carl W. (coaut.) ;
Contenido en: Bois et Forêts des Tropiques Vol. 3637 (juillet 2018), p. 17-26 ISSN: 0006-579X
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Resumen en: Español | Inglés | Frances |
Resumen en español

Un problema clave en la gestión de aprovechamiento madedero es asegurar la regeneración de las especies con valor comercial, lo que requiere un considerable conocimiento de las especies que se gestionan, como la Swietenia macrophylla King (caoba). Este artículo proporciona los resultados de la plantación directa de caoba en tres campos de tala y quema durante su último año de cosecha en Betania, Quintana Roo, México. En cada campo, 121 lugares de siembra se situaron en una parcela de 0,25 ha, y se sembraron cinco semillas en cada uno. 2, 11, 23, 38, 45 y 58 meses después de la siembra se registraron la altura, el diámetro y las indicaciones de daños por la Hypsipyla grandella de todas las semillas que brotaron. Se anotaron las zonas de sombra y el color del suelo. A los 11 meses, la mortalidad entre los pimpollos que estaban vivos a los 2 meses variaba entre campos, pero no variaba con los niveles de sombra o los colores del suelo. Un campo fue abandonado después de 11 meses porque no se siguieron los protocolos de investigación. Comparando los pimpollos vivos a 58 meses con pimpollos vivos a los 2 meses, pero muertos a los 58 meses, el porcentaje de supervivencia varió entre campos y según los niveles de sombra, pero no varió con los colores del suelo. Las condiciones del campo influyeron en el diámetro promedio para pimpollos vivos a los 58 meses, aunque el diámetro no varió con los colores del suelo ni con los niveles de sombra. La altura media variaba entre campos, probablemente variaba con los colores del suelo, y no estaba influida por los niveles de sombra. Dos meses después de sembrar, el 20 % de los lugares de siembra tenían al menos un pimpollo. Cinco años después, el 63 % de estos pimpollos habían muerto, dejando el 7,4 % de los lugares de siembra ocupados por un pimpollo.

La altura de los pimpollos a los 58 meses variaba entre 0,3 y 8 m, con un promedio de 2,7 m. Destaca que ninguno de los 212 pimpollos observados mostraba indicaciones de daños por H. grandella, y que el coste de la técnica es mínimo. Los campos Milpa en su último año de cultivo parecen ser un lugar prometedor para regenerar caoba desde la semilla en condiciones de bosque tropical con mezcla de especies.

Resumen en inglés

A key issue in managing for timber production is ensuring the regeneration of commercially valuable species, such as Swietenia macrophylla King (mahogany), which requires in-depth knowledge of the relevant species. This paper reports on the results of direct seeding of mahogany in three slashand- burn fields during the last year of cultivation, in Betania, Quintana Roo, Mexico. In each field, 121 sowing sites were identified in a 0.25 ha plot, and five seeds were sown in each. Height, diameter and indications of damage by Hypsipyla grandella of all sprouted seeds were recorded at 2, 11, 23, 38, 45, and 58 months after sowing. Shade and soil colour were noted. At 11 months, mortality among seedlings that were alive at 2 months varied among fields but did not vary with shade levels or soil colours. One field was abandoned after 11 months as the research protocol had not been observed. When comparing seedlings alive at 58 months with seedlings alive at 2 months but dead at 58 months, the percentage of survival varied among fields and according to levels of shade, but did not vary with soil colours. The average diameter of seedlings alive at 58 months was influenced by field conditions but did not vary with soil colour or levels of shade. Two months after sowing, 20% of the sowing sites had at least one seedling. Five years later, 63% of those seedlings had died, leaving 7.4% of the sowing sites occupied by a seedling. Seedling height at 58 months varied from 0.3 to 8 m, averaging 2.7 m. Remarkably, none of the 212 seedlings observed showed indications of damage by H. grandella, and the cost of the technique is minimal. Milpa fields in their last cropping year seem to be promising sites for regenerating mahogany from seed in a mixed species tropical forest context.

Resumen en frances

Un problème clé dans la gestion de la production de bois d’oeuvre est d’assurer la régénération d’espèces ayant une valeur commerciale, telles que Swietenia macrophylla King (acajou), ce qui nécessite une connaissance approfondie des espèces concernées. Cet article rend compte des résultats du semis direct de l’acajou dans trois champs cultivés sur brûlis au cours de la dernière année de culture, à Betania, dans la région de Quintana Roo au Mexique. Dans chaque champ, 121 sites de semis ont été identifiés dans une parcelle de 0,25 ha, et cinq graines ont été semées dans chacun d’entre eux. La hauteur, le diamètre et les indications de dommages causés par Hypsipyla grandella de toutes les graines germées ont été enregistrés à 2, 11, 23, 38, 45 et 58 mois après le semis. Les niveaux d’ombrage et la couleur du sol ont été notés. À 11 mois, la mortalité chez les semis qui étaient vivants à 2 mois variait d’un champ à l’autre, mais ne variait pas selon le niveau d’ombrage ou la couleur du sol. Un champ a été abandonné après 11 mois car le protocole de recherche n’avait pas été respecté. En comparant les semis vivants à 58 mois avec les semis vivants à 2 mois mais morts à 58 mois, le pourcentage de survie variait selon les champs et selon les niveaux d’ombrage, mais ne variait pas selon la couleur du sol.

Le diamètre moyen des semis vivants à 58 mois a été influencé par les conditions du champ, mais n’a pas varié selon la couleur du sol ou les niveaux d’ombrage. Leur hauteur moyenne variait d’un champ à l’autre, probablement en fonction de la couleur du sol, et n’était pas influencée par les niveaux d’ombrage. Deux mois après le semis, 20 % des sites de semis avaient au moins un semis. Cinq ans plus tard, 63 % de ces semis étaient morts, laissant 7,4 % des sites de semis occupés par un semis. La hauteur des semis à 58 mois variait de 0,3 à 8 m, avec une moyenne de 2,7 m. Fait remarquable, aucun des 212 semis observés ne montrait des signes de dommages causés par H. grandella, et le coût de la technique est minime. Les champs de milpa dans leur dernière année de culture semblent être des sites prometteurs pour la régénération de l’acajou à partir de graines dans un contexte de forêt tropicale mixte.


29.
- Artículo con arbitraje
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Resumen en: Inglés |
Resumen en inglés

Trends in structural and chemical leaf traits along a chronosequence of semi-evergreen tropical forest and their correlation with litter production and decomposition and associated carbon (C) and nitrogen (N) fluxes were assessed. Leaves of 15 dominant species in each plot were collected to measure leaf area, specific leaf area (SLA), C and N concentration and C:N ratio. Litterfall was measured and litter decomposition experiments were set up in 16 experimental plots in a chronosequence of secondary and mature forest. All five leaf traits combined discriminated the secondary forests from mature forest. SLA, N and C:N were significantly correlated to litter decomposition rates. Litter decompositionwas significantly slower inmature forest compared with secondary forests. TheNconcentration of litter was lowest during the dry season, when litterfall was highest. N concentration in fresh leaves was higher than in litter, indicating thatNis re-absorbed before leaf abscission. Leaf dynamics and associated nutrient cycling differ significantly between secondary forests andmature forest. Ecosystem-level leaf structural and chemical traits are good predictors of the stage of the forest and explain well the differences in decomposition rates between secondary and primary forests.


30.
Artículo
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Resumen en: Inglés |
Resumen en inglés

This paper presents new equations for estimating above-ground biomass (AGB) and biomass components of seventeen forest species in the temperate forests of northwestern Mexico. A data set corresponding to 1336 destructively sampled oak and pine trees was used to fit the models. The generalized method of moments was used to simultaneously fit systems of equations for biomass components and AGB, to ensure additivity. In addition, the carbon content of each tree component was calculated by the dry combustion method, in a TOC analyser. The results of crossvalidation indicated that the fitted equations accounted for on average 91%, 82%, 83% and 76% of the observed variance in stem wood and stem bark, branch and foliage biomass, respectively, whereas the total AGB equations explained on average 93% of the total observed variance in AGB. The inclusion of total height (h) or diameter at breast height² × total height (d²h) as a predictor in the d-only based equations systems slightly improved estimates for stem wood, stem bark and total above-ground biomass, and greatly improved the estimates produced by the branch and foliage biomass equations. The predictive power of the proposed equations is higher than that of existing models for the study area. The fitted equations were used to estimate stand level AGB stocks from data on growing stock in 429 permanent sampling plots. Three machine-learning techniques were used to model the estimated stand level AGB and carbon contents; the selected models were used to map the AGB and carbon distributions in the study area, for which mean values of respectively 129.84 Mg ha-¹ and 63.80 Mg ha-¹ were obtained.


31.
- Artículo con arbitraje
*Solicítelo con su bibliotecario/a
Can cattle grazing substitute fire for maintaining appreciated pine savannas at the frontier of a montane forest biosphere-reserve?
Braasch, Marco ; García Barrios, Luis Enrique (coaut.) ; Ramírez Marcial, Neptalí (coaut.) (1963-) ; Huber Sannwald, Elisabeth (coaut.) ; Cortina Villar, Héctor Sergio (coaut.) (1960-) ;
Contenido en: Agriculture, Ecosystems & Environment Vol. 250 (December 2017), p. 59–7 ISSN: 0167-8809
Nota: Solicítelo con su bibliotecario/a
Resumen en: Inglés |
Resumen en inglés

Human induced savannas in subtropical regions are often favored by small-holder farmers for livestock production and extraction of wood or non-wood products. Frequent burning and grazing are required to maintain the savanna vegetation structure. However, in conservation areas, fire suppression is promoted to avoid wildfires; whereas domestic livestock grazing is considered a strong interfering factor for tree establishment, due to trampling and browsing. In tropical forests which were converted to savannas, competitive exotic grasses have often replaced the native grasses. Where exotic grasses are present, aboveground biomass accumulation and thus man-induced fire risk are high and potentially undermine tree recruitment. On the long-term, the savanna state may shift into a grass-dominated state with little tree cover, generating unfavorable conditions from a livelihood perspective. We examined this problem in a human-induced pine savanna in the La Sepultura Biosphere Reserve in Chiapas, Mexico. Smallholder farmers highly valued this savanna for both livestock production and resin extraction from the fire resistant pine Pinus oocarpa. However, fire suppression and the presence of exotic grasses are reducing the tree recruitment. The main research question was to what degree can cattle grazing replace fire in its role of biomass removal and thereby stimulate pine recruitment and maintain the desired savanna state. We determined current savanna extension in the region and interviewed farmers to reconstruct past savannazation processes and expansion of exotic grasses. We related adult species-specific tree density to the herbaceous-grass cover, and pine and oak seedling and sapling densities to understory vegetation cover, canopy closure, and cattle grazing history. Finally, a field experiment was conducted to examine the effects of livestock grazing on survival and growth of planted pine saplings.

The savanna currently covers 20% of the study site; it is the result of past slash-and-burn agriculture and selective logging, which have favored the expansion of several exotic grass species. In savannas where exotic grasses are abundant, sapling density was lower compared to sites with a native grass cover. While livestock grazing seemed to increase pine seedling density likely as a consequence of reduced grass cover, pine sapling survival however, was significantly reduced by livestock trampling. By seeking a balance between the livestock’s benefits and adverse effects on pine recruitment, farmers may develop an integrated management system adapted to their specific biotic rangeland conditions. It should allow forage production, while controlling the negative effects of exotic grasses on pine recruitment, thus maintaining a productive pine savanna system.


32.
- Artículo con arbitraje
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Resumen en: Inglés |
Resumen en inglés

We document the first record of Imantodes gemmistratus for Zacatecas state, Mexico. In August 2016, one adult male was found in a dry forest and oak forest ecotone in the Municipality of Valparaiso. This new record extends known distribution of the species 166 km to the northeast from the nearest previous record in Nayarit state.


33.
Tesis - Maestría
Diversidad y estructura genética de árboles tropicales en la Reserva de la Biósfera Selva El Ocote, Chiapas, México / María Zenaida López López
López López, María Zenaida (autora) ; Ruiz Montoya, Lorena (directora) (1964-) ; Lorenzo Monterrubio, Consuelo (asesora) ; Ramírez Marcial, Neptalí (asesor) (1963-) ;
San Cristóbal de Las Casas, Chiapas, México : El Colegio de la Frontera Sur , 2017
Clasificación: TE/574.526420972 / L6
Bibliotecas: San Cristóbal
Cerrar
SIBE San Cristóbal
ECO010019181 (Disponible)
Disponibles para prestamo: 1
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Resumen en español

La Reserva de la Biósfera Selva El Ocote, es considerada una de las áreas de mayor extensión de selva tropical y alberga una elevada diversidad biológica. Sin embargo, se enfrenta a problemas socio-ambientales que conllevan al deterioro de los ecosistemas, lo que pone en peligro a las poblaciones de árboles tropicales. Dentro de los sitios de estudio, se distribuyen en mayor abundancia Brosimum alicastrum Sw., Sapium macrocarpum Müll-Arg., Heliocarpus appendiculatus L. y Cecropia peltata Turcz, especies de árboles que difieren en su afinidad sucesional y síndrome de dispersión. A estas especies se les comparó la diversidad y estructura genética mediante la amplificación de dos regiones de ADN nuclear ribosomal (ITS 1-2 e ITS 3-4) como marcadores genéticos, y a partir de secuencias concatenada se obtuvieron estimadores de diversidad genética convencionales. Brosimum alicastrum y S. macrocarpum, de sucesión intermedia y síndrome de dispersión zoocoria, mostraron los más altos niveles de diversidad nucleotídica (TT= 0.158, TT= 0.127, respectivamente) y diferenciación genética (Φst= 0.60, Φst= 0.25; respectivamente). Mientras que especies las pioneras y con síndrome de dispersión anemocora y zoocora, presentaron menor diversidad nucleotídica y baja diferenciación genética: H. appendiculatus (TT= 0.008, Φst = 0.12), C. peltata, (TT= 0.033; Φst= 0.13). Los resultados sugieren que las especies sucesionalmente intermedias son más diversas y con poblaciones con mayor diferenciación que las pioneras en la REBISO. El síndrome de dispersión influye en el mantenimiento de la diversidad genética pero no necesariamente en la estructura poblacional de las especies.

Índice

Resumen
Capítulo 1. Introducción
Importancia de los árboles tropicales
Diversidad genética de árboles tropicales
Reserva de la Biosfera Selva El Ocote
Las especies de estudio
Objetivo
Hipótesis
Capítulo 2. Diversidad y estructura genética de árboles tropicales en la Reserva de la Biósfera Selva El Ocote, Chiapas, México
Resumen
Introducción
Materiales y métodos
Resultados
Discusión
Agradecimientos
Literatura citada
Tablas
Figuras
Capítulo 3. Conclusiones generales
Literatura citada


34.
Artículo
Resumen en: Inglés |
Resumen en inglés

The tropical dry forest (BTS) of Yucatan Peninsula has been managed for centuries, but the relationship between these management efforts and their effects on trees diversity has not been fully understood. The aim of this study was to evaluate the effect of forest management (thinning, harvesting and enrichment of species), in the structure of secondary vegetation derived from dry tropical forests, in two communities in Calakmul, Campeche, Southeast Mexico. We analyzed changes in the composition, species richness, species diversity, and structure in secondary vegetation subject to following types of management: (1) secondary vegetation with beekeeping management (MA), secondary vegetation with forest management (MF), natural secondary vegetation (SM) and tropical dry forest (BTS). The species composition was similar between secondary vegetation managed and unmanaged. On the other hand, between managed secondary vegetation and BTS there were differences in species composition. Species richness was not different between all conditions. MA showed the lowest species diversity and presented higher average density (5 413±770.26 ind.ha-1).MF had lowest average density (3 289 ± 1 183.60 ind.ha-1). BTS showed the highest average basal area (24.89 ± 1.56 m2.ha-1) regarding the other conditions. We concluded that is necessary to keep monitoring the managed areas to detect effects of management that may be adverse or favorable to conservation of floristic diversity of BTS.


35.
Tesis - Maestría
Producción sustentable de leña y carbón, una vía para luchar contra la pobreza / Vitza Cabrera Manrique
Cabrera Manrique, Vitza ; Valdéz Hernández, Mirna (tutora) ; Macario Mendoza, Pedro A. (evaluador) ;
Chetumal, Quintana Roo, México : El Colegio de la Frontera Sur :: Université de Sherbrooke , 2017
Clasificación: TE/333.953970972 / C3
Cerrar
SIBE Campeche
ECO040006719 (Disponible)
Disponibles para prestamo: 1
Cerrar
SIBE Chetumal
ECO030008644 (Disponible)
Disponibles para prestamo: 1
Cerrar
SIBE San Cristóbal
ECO010019154 (Disponible)
Disponibles para prestamo: 1
Cerrar
SIBE Tapachula
ECO020013727 (Disponible)
Disponibles para prestamo: 1
Cerrar
SIBE Villahermosa
ECO050006328 (Disponible)
Disponibles para prestamo: 1
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Índice | Resumen en: Español | Frances |
Resumen en español

Los bosques son ecosistemas que se encuentran distribuidos en todas las regiones del planeta. Intervienen en diversos ciclos biogeoquímicos y actúan como sumideros de carbono, lo que ayuda en la regulación del clima y ofrecen una gran cantidad de productos de necesidad básica. La leña y el carbón forman parte de estos productos, los cuales son la principal fuente de energía para millones de personas, sobre todo en países en desarrollo. Además, esta industria genera gran cantidad de empleos a lo largo de la cadena productiva. A pesar de su relevancia, esta industria se ha mantenido en el sector informal por ser considerada una fuente de energía para pobres. Hasta hoy, existe una gran ignorancia sobre la cantidad de leña y carbón que es suministrada y consumida, así como del funcionamiento y la dinámica de la cadena productiva. Asimismo, no existen leyes que regularicen la actividad, ni un interés de los gobiernos por desarrollarla. Este ensayo evalúa la contribución y sustentabilidad de la industria de la leña y producción de carbón en la lucha contra la pobreza. Los estudios de caso presentados muestran los vacios de información que existen a lo largo de la cadena y una deficiencia en la ejecución de políticas públicas; situación que demerita su sustentabilidad y uso como mecanismo para luchar contra la pobreza. Para lograr la sustentabilidad es imprescindible implementar políticas públicas que reconozcan su valor y formalicen y regularicen la actividad, así como estudios que permitan cubrir dichos vacios. Es necesario desarrollar, junto con las comunidades, planes de manejo forestal sustentable y aplicar tecnología que eficientice el uso de leña iv y la producción de carbón. Sólo así, esta industria podría llegar a ser una vía contra la pobreza.

Resumen en frances

Les forêts sont reparties dans toutes les régions de la planète. Ils jouent un rôle important dans les différents cycles biogéochimiques et comme puits de carbone, ce qu'aide à réguler le climat. Ainsi, ils offrent de nombreux produits de base. Le bois de chauffage et le charbon forme partie de ces produits, lesquels sont la principale source d’énergie pour des millions de personnes, en particulier dans les pays en développement. Aussi, cette industrie crée un grand nombre des emplois, tout au long la chaîne productive. Malgré son importance, elle demeure dans le secteur informel, car elle est considérée comme l'énergie des pauvres. Jusqu'à aujourd'hui, il y a une grande ignorance sur la quantité de bois de chauffage et de charbon qui est fournie et consommée, ainsi comme du fonctionnement et de la dynamique de la chaîne de production. D'ailleurs, il n’y a aucune loi qui le régularise ou un réel intérêt des gouvernements pour le développer. Cet essai a pour objective d'évaluer la contribution et la durabilité de l'industrie de bois énergie et la production de bois de chauffage dans la lutte contre la pauvreté. Les études de cas présentés montrent qu'il y a une absence d'information, tout au long la chaîne productive et un manque des politiques publiques. Cela porte atteinte sa durabilité et sa utilisation comme un mécanisme dans la lutte de la pauvreté. Pour atteindre la durabilité, il est essentiel de mettre en oeuvre des politiques publiques qui reconnaissent sa valeur, ce qui permette de formaliser et réglementer l'activité. De plus, il est nécessaire de développer, avec des communautés, des plans d'aménagement forestier durable et employer des technologies qu'améliore l'utilisation vi du bois de chauffage et la production du charbon. Cela serait la seule manière pour que cette industrie puisse être un mécanisme dans la lutte contre la pauvreté.

Índice

Agradecimientos
Resumen
Résumé
Lista de Tablas
Lista de Figuras
Glosario
Abreviaturas y Acrónimos
Introducción
Capítulo 1: Sustentabilidad en la extracción de la leña y carbón
1.1 Los bosques como sumideros de carbono
1.1.1 Los bosques el día de hoy
1.1.2 ¿Qué va a pasar con los bosques?
1.2 La leña y el carbón como fuente de energía
1.2.1 El uso actual de la leña y prospecciones
1.2.2 Factores que influyen en el uso de leña y carbón
1.2.3 Efectos de la extracción de la leña y producción del carbón
1.3 Manejo de los bosques y uso eficiente de la leña para mitigar las concentraciones de CO2 atmosférico
1.3.1 Manejo sustentable de los bosques
1.3.2 Uso y producción eficiente de leña y carbón
Capítulo 2: La industria de la leña y el carbón, ¿una medida para luchar contra la pobreza?
2.1 Un vistazo a la industria de la leña y el carbón
2.1.1 Eslabones de la cadena de producción y sus actores principales
2.2 Importancia socioeconómica de la industria de la leña y carbón
2.2.1 La industria como una herramienta para luchar contra la pobreza
2.3 Estrategias para lograr una reducción de la pobreza
2.3.1 Acciones en cada eslabón
Capítulo 3: Uso de la leña en los bosques tropicales secos
3.1 Los bosques tropicales secos
3.2 Importancia socioeconómica y ambiental de los bosques tropicales secos
3.3 Estudios de caso
3.3.1 Región Norte de Camerún, la sabana
3.3.2 Región del sureste de México, la selva seca en Yucatán
Conclusión
Referencias


PDF PDF
Resumen en: Inglés |
Resumen en inglés

Natural forest management in the tropics is often impeded by scarcity of advanced regeneration of commercial species. To supplement natural regeneration in a forest managed by a community in the Selva Maya of Mexico, nursery-grown Swietenia macrophylla seedlings were planted in multiple-tree felling gaps, known as bosquetes. Remnant trees are often left standing in gaps for cultural and economic reasons or due to their official protected status. We focus on these purposefully retained trees and their impacts on planted seedlings. Sampled bosquetes were 400–1800 m², of which remnant trees covered a mean of 29%. Seedling height growth rates over the first 18 months after out-planting more than doubled with increased canopy openness from 0.09 m year-¹ under medium cover to 0.22 m year-¹ in full sun. Liana infestations and shoot tip damage were most frequent on seedlings in the open, but, contrary to our expectations, height growth rates were 0.14 m year-¹ faster for liana-infested seedlings than non-infested and did not differ between damaged and undamaged seedlings. Apparently the more rapid height growth of well-illuminated seedlings more than compensated for the effects of lianas or shoot tip damage. Despite the abundance of remnant trees and their negative effects on seedling growth, enrichment planting in bosquetes has potential for community-based natural forest management in the tropics in supplementing natural regeneration of commercial species. One obvious recommendation is to leave fewer remnant trees, especially those of commercial species that are non-merchantable due to stem defects and trees retained for no apparent reason, which together constituted half of the remnant crown cover in the sampled bosquetes. Finally, given the rapid growth of lianas and understory palms in large canopy gaps, at least the most vigorous of the planted seedlings should be tended for at least two years.


37.
Libro
Insects and other arthropods of tropical America / Paul E. Hanson, Kenji Nishida
Hanson, Paul E. ; Nishida, Kenji (coaut.) (1972-) ;
Ithaca, New York, United States : Cornell University Press. Comstock Publishing Associates , 2016
Clasificación: 595.7098 / H3
Bibliotecas: Chetumal
Cerrar
SIBE Chetumal
ECO030008546 (Disponible)
Disponibles para prestamo: 1
Índice | Resumen en: Inglés |
Resumen en inglés

Visitors to tropical forests generally come to see the birds, mammals, and plants. Aside from butterflies, however, insects usually do not make it on the list of things to see. This is a shame. Insects are everywhere, they are often as beautiful as the showiest of birds, and they have a fascinating natural history. With their beautifully illustrated guide to insects and other arthropods, Paul E. Hanson and Kenji Nishida put the focus on readily observable insects that one encounters while strolling through a tropical forest in the Americas. It is a general belief that insects in the tropics are larger and more colorful than insects in temperate regions, but this simply reflects a greater diversity of nearly all types of insects in the tropics. On a single rainforest tree, for example, you will find more species of ant than in all of England. Though written for those who have no prior knowledge of insects, this book should also prove useful to those who study them. In addition to descriptions of the principal insect families, the reader will find a wealth of biological information that serves as an introduction to the natural history of insects and related classes. Sidebars on insect behavior and ecological factors enhance the descriptive accounts. Kenji Nishida's stunning photographs—many of which show insects in action in their natural settings—add appeal to every page. A final chapter provides a glimpse into the intriguing world of spiders, scorpions, crabs, and other arthropods.

Índice

1. Introduction to Arthropods
2. Small Orders
3. True Bugs and Their Kin
4. Beetles
5. Wasps, Bees, Ants
6. Moths and Butterflies
7. Flies and Their Kin
8. Other Arthropods
Glossary
Bibliography
Acknowledgments
Photo Credits
Index
About the author and Photographer


38.
- Artículo con arbitraje
Integración del balance hídrico en la modelación de la distribución de especies de árboles mexicanos
Vaca Genuit, Raúl Abel ; Golicher, Duncan John (coaut.) ;
Contenido en: Botanical Sciences Vol. 94, no. 1 (2016), p. 1-18 ISSN: 2007-4298
PDF
Resumen en: Español | Inglés |
Resumen en español

El modelado de la distribución de especies se basa típicamente en modelos estáticos que integran variables puramente climáticas. Una alternativa es utilizar modelos mecanísticos o semi-mecanísticos que incorporan variables que afectan la respuesta fisiológica de los organismos. En este trabajo demostramos la importancia de complementar el uso de estos dos tipos de modelos para predecir la distribución de especies de árboles mexicanos. Se seleccionaron 258 especies asociadas a cinco diferentes eco- sistemas, que varían en su grado de exposición a los períodos de sequía y se ajustaron modelos aditivos generalizados (GAM). Se mapeó la dinámica anual de humedad del suelo (DHanual) a lo largo de Mesoamérica, y se comparó la habilidad predictiva de este proceso en contraste con modelos ajustados con precipitación anual (Panual). El efecto de la temperatura promedio y intervalo anual de temperatura se incluyó en ambos modelos. DHanual mostró una capacidad significativamente mayor que Panual para predecir la distribución de especies que presentan una respuesta general al estrés hídrico caracterizada por el ahorro y la tolerancia. Se observó un incremento promedio en el AUC al reemplazar Panual por DHanual para los grupos de especies de matorral xerófilo (0.15); de bosque tropical caducifolio (0.09) y de bosque tropical húmedo (0.07). DHanual no contribuyó a mejorar las predicciones para especies de áreas montañosas. El balance hídrico del suelo calculado a escala regional es un predictor valioso para entender diferencias en la distribución de especies de bosques tropicales cálidos de secos a húmedos, donde la temperatura se mantiene comparativamente más constante. Incorporar elementos espaciales, específicamente elevación, podría contribuir a definir mejor la distribución de especies de áreas montañosas.

DHanual introduce una importante fuente de incertidumbre respecto a la información climática debido a la dificultad de integrar parámetros del suelo y la variabilidad geomorfológica que ocurre a escalas locales.

Resumen en inglés

Species distribution models are typically based on relationships between species occurrence and simple climatic variables. An alternative strategy is to use mechanistic or semi-mechanistic models that incorporate variables that are known to have important effects on physiological responses of the organisms. We compared models built using simple climatic variables with models incorporating calculations of monthly soil water balance when predicting the distribution of 258 Mexican tree species associated with five different ecosystems. The species chosen varied in their degree of exposure to periods of drought. Water balance was calculated using a bucket model that integrated the effects of evapotranspiration and rainfall over a year. Models incorporating calculated soil water balance were contrasted with models that used net annual rainfall as a measure of variability in water availability. The effects of mean annual temperature and temperature range were included in both sets of models. More detailed water balance models showed a significantly improved ability to predict the distribution of some, but not all, species. The observed increase in mean AUC when replacing Panual by DHanual was higher for the group of species of xeric scrub (0.15), intermediate for the group of species of deciduous tropical forests (0.09), and significant, but comparatively low for the group of species of tropical moist forests (0.07). Calculated water balance did not improve predictions for species found in montane forests. We conclude that including detailed calculations of soil water balance can improve the species distribution models in areas of both moist and dry warm tropical forests, where temperature remains comparatively constant.

However including variability in soil water balance is less important when species distributions are limited by the effect of elevation on temperature. Model predictions could be further refined through the incorporation of soil parameters and geomorphological variability at a local scales.


Resumen en: Inglés |
Resumen en inglés

We combined two existing datasets of vegetation aboveground biomass (AGB) (Proceedings of the National Academy of Sciences of the United States of America, 108, 2011, 9899; Nature Climate Change, 2, 2012, 182) into a pan-tropical AGB map at 1- km resolution using an independent reference dataset of field observations and locally calibrated high-resolution biomass maps, harmonized and upscaled to 14 477 1-km AGB estimates. Our data fusion approach uses bias removal and weighted linear averaging that incorporates and spatializes the biomass patterns indicated by the reference data. The method was applied independently in areas (strata) with homogeneous error patterns of the input (Saatchi and Baccini) maps, which were estimated from the reference data and additional covariates. Based on the fused map, we estimated AGB stock for the tropics (23.4 N–23.4 S) of 375 Pg dry mass, 9–18% lower than the Saatchi and Baccini estimates. The fused map also showed differing spatial patterns of AGB over large areas, with higher AGB density in the dense forest areas in the Congo basin, Eastern Amazon and South-East Asia, and lower values in Central America and in most dry vegetation areas of Africa than either of the input maps. The validation exercise, based on 2118 estimates from the reference dataset not used in the fusion process, showed that the fused map had a RMSE 15–21% lower than that of the input maps and, most importantly, nearly unbiased estimates (mean bias 5 Mg dry mass ha 1 vs. 21 and 28 Mg ha 1 for the input maps). The fusion method can be applied at any scale including the policy-relevant national level, where it can provide improved biomass estimates by integrating existing regional biomass maps as input maps and additional, country-specific reference datasets.


40.
- Artículo con arbitraje
Letter to the editor. Tropical ungulates special number
Reyna Hurtado, Rafael Ángel ;
Contenido en: Therya Vol. 7, no. 1 (2016), p. 1-2 ISSN: 2007-3364
PDF PDF

41.
Tesis - Maestría
Potencial de aprovechamiento de leña en bosques secundarios manejados en el sur del estado de Campeche, México / Efraín Aguirre Cortés
Aguirre Cortés, Efraín (autor) ; Macario Mendoza, Pedro A. (tutor) ; López Martínez, Jorge Omar (asesor) ; Pat Fernández, Juan Manuel (asesor) ;
Chetumal, Quintana Roo, México : El Colegio de la Frontera Sur , 2016
Clasificación: TE/333.953970972 / A3
Bibliotecas: Chetumal
Cerrar
SIBE Chetumal
ECO030008645 (Disponible)
Disponibles para prestamo: 1
PDF
Índice | Resumen en: Español |
Resumen en español

El uso de leña, carbón y la biomasa vegetal es una práctica ancestral en la raza humana y ha sido analizada desde distintas perspectivas. Una plétora de estudios se ha desarrollado para evaluar las propiedades fisicoquímicas de los biocombustibles, particularmente de la biomasa forestal, así como sus implicaciones en el desarrollo de sistemas tecnológicos para su aprovechamiento. Sin embargo son pocos los estudios que relacionan el uso de la biomasa desde una perspectiva rural, así como sus implicaciones para la conservación de los servicios ecosistémicos. Los paisajes culturales representan entidades en donde hombre y naturaleza interactúan a través de distintas manifestaciones. Este trabajo exploró la relación que existe entre los habitantes rurales de un paisaje cultural y los beneficios que los ecosistemas forestales les ofrecen a partir del uso de subproductos forestales, particularmente la leña. Se entrevistaron 132 pobladores y se encontró que utilizan 60 especies forestales, provenientes principalmente de individuos muertos (95 %). Se observó que los pobladores no diferencian en la utilización de las especies duras. Observamos que las características principales para determinar el uso de la leña fue la disponibilidad del recurso y algunas características de los árboles de las cuales se extrae el recurso. Adicionalmente, nuestros resultados sugieren que existe relación entre el conocimiento local y la regeneración natural de los bosques tropicales, y la apropiación de la leña responde a una lógica de conservación y manejo de los bosques tropicales; y es un producto forestal no maderable de importancia cultural, socioeconómica y ecológica.

Índice

Resumen
Introducción
Artículo sometido a la Revista Chapingo Serie Ciencias Forestales y del Ambiente
Conclusiones
Anexos


42.
- Artículo con arbitraje
Survival of Swietenia macrophylla seeds sown into slash-and-burn fields in Quintana Roo, Mexico
Negreros Castillo, Patricia ; Martínez Salazar, Imelda (coaut.) ; Kellner, Kenneth F. (coaut.) ; Mize, Carl W. (coaut.) ; Swihart, Robert K. (coaut.) ; Navarro Martínez, María Angélica (coaut.) ;
Contenido en: Bois et Forêts des Tropiques Vol. 329, no. 3 (2016), p. 43-52 ISSN: 1777-5760
PDF
Resumen en: Español | Inglés | Frances |
Resumen en español

En América tropical, la regeneración de la caoba de hoja grande, Swietenia macrophylla King, especie comercial de grandísima importancia, presenta dificultades por sus características de fructificación y dispersión, su escasa tolerancia a la sombra y al aprovechamiento forestal. Las áreas de cultivo de corte y quema abandonadas en el Estado mexicano de Quintana Roo son excelentes espacios para el establecimiento de plántulas de caoba, pero aún no se ha encontrado un medio eficaz para garantizar la supervivencia de las semillas. Este estudio evaluó la probabilidad de depredación en siembras directas de caoba analizando tres tipos de tratamiento: cuatro tipos de protección de semillas, dos métodos de siembra y dos momentos de siembra en el día. El porcentaje promedio de semillas eliminadas o parcialmente consumidas en un período de 12 horas varía de 1.1 a 7.7%, dependiendo de los cuatro tipos de tratamiento de protección, pero no varía según los dos métodos de siembra. La precipitación durante la siembra tuvo un importante efecto positivo en la supervivencia, mientras que la temperatura diaria mínima tuvo un efecto ligeramente negativo. El efecto de la fecha de siembra, según el calendario juliano, fue positivo para la supervivencia de las semillas. La depredación de semillas no varía entre tratamientos que permiten el acceso sólo a roedores, sólo a insectos, o a ambos; la depredación es mayor con estos tres tipos de tratamiento que con el tratamiento que impide totalmente el acceso a los depredadores. La depredación de semillas no se vio influida por la hora del día en que se sembraron. La siembra directa es favorable para la regeneración de la caoba, especialmente cuando se remojan las semillas al menos durante dos semanas antes de la siembra para reducir los riesgos de depredación y aumentar las posibilidades de supervivencia y crecimiento.

Resumen en inglés

In tropical America, regeneration of bigleaf mahogany, Swietenia macrophylla King, the most important commercial tree species, is problematic because of its fruiting and dispersal characteristics, very low tolerance of shade and response to logging. In Quintana Roo, Mexico, abandoned slash-and-burn cropfields are excellent candidates for seedling establishment, but an efficient way to establish mahogany seedlings has not been identified. This study assessed the probability of predation on directly sown mahogany seeds, examining the effects of three treatments (four types of seed protection, two sowing methods, two times of day for sowing). The mean percentage of seeds either partially consumed or removed during a 12-hour period varied from 1.1 to 7.7% among the four seed protection treatments and did not differ between the two sowing methods. Precipitation had an important positive effect on survival, and minimum daily temperature had a marginal negative effect on survival. The Julian calendar date had a positive effect on seed survival. Seed predation did not differ among the seed protection treatments that allowed access only to rodents, only to insects, and to both types of seed predators, and predation was greater with these three treatments than with the no-access treatment. Seed predation was not influenced by the time of day of sowing. Direct sowing offers a good option for regenerating mahogany, especially if the mahogany seeds are soaked for at least 2 weeks before sowing to reduce predation risks and increase prospects for seed survival and seedling establishment.

Resumen en frances

En Amérique tropicale, la régénération de l’acajou à grandes feuilles, Swietenia macrophylla King, essence commerciale majeure, est problématique en raison de ses caractéristiques de fructification et de dispersion et de sa faible tolérance à l’ombre et sa réaction à l’exploitation forestière. Dans l’État de Quintana Roo, au Mexique, les brûlis abandonnés offrent d’excellents espaces pour l’établissement de jeunes plants, mais un moyen efficace permettant d’assurer la survie des semences reste à identifier. La présente étude s’est attachée à évaluer la probabilité de prédation des semis directs d’acajou, en analysant les effets de trois types de traitement (quatre types de protection des semences, deux méthodes de semis et deux moments de semis dans la journée). Le pourcentage moyen de semences éliminées ou consommées en partie sur une période de 12 heures varie de 1,1 à 7,7 % selon les quatre types de traitement des semences mais ne varie pas selon les deux méthodes de semis. La précipitation au moment du semis est fortement positive pour la reprise des semences, tandis que la température journalière minimale a un effet légèrement négatif. L’effet de la date des semis, selon le calendrier julien, est positif pour la survie des semences. La prédation des semences ne varie pas selon les traitements de protection qui permettent l’accès aux seuls rongeurs, aux seuls insectes et aux deux, et la prédation est plus importante avec ces trois types de traitement qu’avec le traitement interdisant totalement l’accès aux prédateurs. La prédation des semences n’est pas influencée par le moment du semis dans la journée. Le semis direct est favorable à la régénération de l’acajou, notamment lorsque les semences sont trempées pendant au moins deux semaines avant le semis pour réduire les risques de prédation et augmenter les chances de survie et de reprise.


43.
- Capítulo de libro con arbitraje
Distribution of vegetation types
Islebe, Gerald A. ; Sánchez Sánchez, Odilón Manuel (coaut.) ; Valdéz Hernández, Mirna (coaut.) ; Weissenberger, Holger (coaut.) ;
Contenido en: Biodiversity and conservation of the Yucatan Peninsula New York : Springer International Publishing Switzerland, 2015 p. 39-53 ISBN:978-3-319-06528-1
Resumen en: Inglés |
Resumen en inglés

This chapter presents an overview of the vegetation types of the Yucatán Peninsula. Mean annual precipitation, terrain and soil characteristics explain the large-scale distribution of forest types in the Yucatán Peninsula. Tropical (high) forest is found in areas with>800 mm of mean annual precipitation, while dry (low) tropical forest is distributed in areas with<800 mm of mean annual precipitation. Tropical forest has canopy heights of more than 30 m and mostly presents three well-defined vegetative strata. The distribution of tropical forest is mainly in the central, eastern and southern parts of the Yucatán Peninsula. Dry tropical forest has canopy heights up to 20 m, and is widely distributed in the Yucatán Peninsula in different successional stages. Other woody vegetation types include mangroves, petenes and pine savannas. Open vegetation types include coastal dunes, marsh, and savanna vegetation. Disturbed tropical and dry tropical forest of all successional stages covers more than 7.4 million ha at present, and requires detailed management plans to maintain future ecosystems benefits.


44.
Artículo
PDF PDF
Resumen en: Español | Inglés |
Resumen en español

Los monocultivos extensivos de palma africana (Elaeis guineensis) han sido identificados como una de las amenazas más importantes para la diversidad biológica en bosques tropicales. Mediante el uso de redes de niebla se evaluó la riqueza, diversidad y estructura de las comunidades de aves de sotobosque presentes en tres tipos de hábitat de un humedal tropical: bosques naturales, sitios en regeneración (“guamiles”) y cultivos de palma africana. Se capturó un total de 734 aves de 106 especies, pertenecientes a 22 familias. Los hábitats con mayor diversidad fueron los bosques (63 especies y 329 capturas), seguido de los guamiles (62 especies y 368 capturas) y por último los cultivos de palma africana (11 especies y 37 capturas). Como se esperaba, se encontró diferencia estadística entre los hábitat estudiados. Únicamente el 11% de las especies y 5% del total de capturas se registraron en cultivos de palma africana. Nuestros datos reflejan que los cultivos de palma son una seria amenaza para la riqueza de aves del país, por lo que es prioritario generar lineamientos de manejo con criterios científicos y de conservación.

Resumen en inglés

African oil palm (Elaeis guineensis) crops have been identified as one of the most important threats to biodiversity of tropical forests. By mean of mist nets, species richness, diversity and structure of understory bird communities were studied in three vegetation types of a Neotropical wetland: humid tropical forest remnants, natural regeneration sites (“guamiles”), and African oil palm plantations. We captured a total of 734 birds of 106 species, belonging to 22 families. The habitat with highest diversity was forest (63 species and 329 individuals), followed by guamiles (62 species and 368 individuals) and finally oil palm plantations (11 species and 37 individuals). As expected, statistical differences were found among the studied habitats. Only 11% of species and 5% of the total captured birds were recorded in the African oil palm plantations. Our data show that oil palm cultivation represents a serious threat to biological diversity, making it a priority to generate guidelines based on scientific and conservation criteria.


45.
Artículo
*En hemeroteca, SIBE-San Cristóbal
Diversidad, estructura y regeneración de la selva tropical estacionalmente seca de la Península de Yucatán, México
Hernández Ramírez, Angélica María ; García Méndez, Socorro (coaut.) ;
Contenido en: Revista de Biología Tropical Vol. 63, no. 3 (setiembre 2015), p. 603-616 ISSN: 0034-7744
Bibliotecas: San Cristóbal
Cerrar
SIBE San Cristóbal
56572-10 (Disponible)
Disponibles para prestamo: 1
Nota: En hemeroteca, SIBE-San Cristóbal
PDF
Resumen en: Español | Inglés |
Resumen en español

Las selvas tropicales estacionalmente secas son consideradas como uno de los ecosistemas más amenazados en las tierras bajas de la región tropical. El objetivo de este estudio fue caracterizar la composición florística, riqueza, diversidad, estructura y regeneración de una selva tropical estacionalmente seca constituida por selva mediana, vegetación secundaria y selva baja inundable localizada en el noroeste de la Península de Yucatán, México. Se utilizó el protocolo de muestreo estandarizado propuesto por Gentry(0.1 ha por tipo de vegetación en 2007) con la finalidad de comprar los resultados obtenidos en este estudio con respecto a otras selvas estacionalmente secas en Mesoamérica. Se registraron un total de 77 especies pertenecientes a 32 familias de plantas. Fabaceae y Euphorbiaceae fueron lasfamilias con el mayor número de especies observadas en los tres tipos de vegetación estudiados. Se observó un alto recambio de especies a nivel del paisaje (Índice de Similitud de Sorensen; 0.19- 0.40). Las especies no-regenerativas fueron dominantes (50-51 %), seguida de las especies regenerativas (30-28 %) y colonizadoras (14-21 %) en los tres tipos de vegetación estudiados.

Zoocoria fue el modo de dispersión comúnmente observado en el área de estudio. El 88 % de las especies observadas en el área de estudio se distribuyen en Centro América. La selva del noroeste de la Península de Yucatán compartió diversos atributos florísticos a los observados en otras selvas estacionalmente secas de Meosoamérica. Las características estructuralesde la vegetación (número de individuos y área basal), así como el número de especies de lianas registradas en este estudio se asociaron a los eventos de alteración natural ocurridos recientemente en el área de estudio. Los resultados obtenidos en este estudio sugieren que la selva del noroeste de la Península de Yucatán ha sido resiliente a los eventos de alteración natural (huracanes), lo que le ha permitido mantener los valores de riqueza específica dentro del rango considerado como común para las selvas estacionalmente secas de Mesoamérica. Sin embargo, la recuperación y regeneración de la vegetación a largo plazo depende de los animales dispersores de semillas. Este estudio enfatiza en la importancia de establecer una red de áreas naturales protegidas con la finalidad de conservar tanto a la diversidad como a la diversidad en las selvas estacionalmente secas de Mesoamérica.

Resumen en inglés

Diversity, structure and regeneration of the seasonally dry tropical forest of Yucatán Península, Mexico. Seasonally dry tropical forests are considered as the most endangered ecosystem in lowland tropics. The aim of this study was to characterize the floristic composition, richness, diversity, structure and regeneration of a seasonally dry tropical forest landscape constituted by mature forest, secondary forest and seasonally inundated forest located in the Northeastern part of the Yucatán Península, Mexico. We used the Gentry’s standard inventory plot methodology (0.1 ha per forest type in 2007) for facilitating comparison with other Mesoamerican seasonally dry tropical forests. A total of 77 species belonging to 32 families were observed in the study area. Fabaceae and Euphorbiaceae were the families with the largest taxonomic richness in the three forest types. Low levels of β diversity were observed among forest types (0.19-0.40), suggesting a high turnover of species at landscape level. The non-regenerative species were dominant (50-51 %), followed by regenerative species (30- 28 %), and colonizer species (14-21 %) in the three forest types.

Zoochory was the most common dispersal type in the study area. The 88 % of the observed species in the study area were distributed in Central America. Some floristic attributes of the seasonally dry tropical forest of the Yucatán Península, fall into the values reported for Mesoamerican seasonally dry tropical forests. Natural disturbances contributed to explain the high number of individuals, the low number of liana species, as well as the low values of basal area observed in this study. Our results suggested that the seasonally dry tropical forest of Yucatán Península seems to be resilient to natural disturbances (hurricane) in terms of the observed number of species and families, when compared with the reported values in Mesoamerican seasonally dry tropical forests. Nonetheless, the recovery and regeneration of vegetation in long-term depends on animal-dispersed species. This study highlights the importance of establishing multiple protected areas throughout the Mesoamerican seasonally dry tropical forest in order to conserve both ∝- and β- diversity.


46.
- Capítulo de libro con arbitraje
Natural and human induced disturbance in vegetation
Sánchez Sánchez, Odilón Manuel ; Islebe, Gerald A. (coaut.) ; Ramírez Barajas, Pablo Jesús (coaut.) ; Torrescano Valle, Nuria (coaut.) ;
Contenido en: Biodiversity and conservation of the Yucatan Peninsula New York : Springer International Publishing Switzerland, 2015 p. 153-167 ISBN:978-3-319-06528-1
Resumen en: Inglés |
Resumen en inglés

The present chapter analyses natural and human disturbance which impacted the vegetation of the Yucatán Peninsula. The relevance of the slashand- burn system is outlined, a system used for many centuries, and the relevance of fire in this practice. Slash-and-burn and fires provide information about the present structure and composition of the tropical forests of the Yucatán Peninsula. Several seral stages are identified, which agree well with seral stages recognized by modern Maya farmers. In relation to natural disturbance, we analyze the influence of hurricanes and their immediate and general effects on the vegetation and related fauna. Hurricanes and droughts are relevant agents of disturbance, as hurricanes cause considerable structural damage to forests and contribute to the accumulation of large quantities of dry biomass. This biomass can act as fuel for large forest fires. We discuss the natural dynamics that have characterized the vegetation of the Yucatán Peninsula through time, showing that it is a resilient ecosystem.


47.
- Artículo con arbitraje
Percepción local de los servicios ecológicos y de bienestar de la selva de la zona maya en Quintana Roo, México
Infante Ramírez, Karla Diana ; Arce Ibarra, Ana Minerva (coaut.) ;
Contenido en: Investigaciones Geográficas No. 86 (2015), p. 67-81 ISSN: 0188-4611
PDF PDF
Resumen en: Español | Inglés |
Resumen en español

Este estudio evalúa la percepción local sobre los servicios ecológicos y de bienestar de la selva en comunidades de la zona maya del centro de Quintana Roo. Se trabajó con seis unidades de paisaje, las cuales fueron delimitadas con la participación de habitantes de las comunidades y con una revisión de literatura. Para identificar los servicios que perciben las comunidades de la selva, se utilizaron entrevistas abiertas y semiestructuradas, observación participante, entrevistas a profundidad y talleres comunitarios. Los resultados muestran que los entrevistados identificaron servicios de provisión, de regulación y mantenimiento, y culturales. En particular, percibieron más servicios ecológicos en las unidades del “monte alto” y el “acahual de 20 años” o más, mientras que la “sabana” fue identificada como la que menos servicios les proporciona. Además, a partir de la teoría de los estudios de desarrollo, el estudio identifica las tres dimensiones del concepto de “bienestar humano”: la material, la relacional y la subjetiva, y logra presentar la relación de éstas con los servicios ecológicos percibidos por las comunidades estudiadas. Los resultados muestran una clara interacción sociedad maya-naturaleza y son útiles para orientar la toma de decisiones en el manejo de los recursos naturales, tanto a nivel comunitario como gubernamental.

Resumen en inglés

This study assesses the Maya communities’ local perception of the ecological services and well-being obtained from the rainforest of Quintana Roo. To do this, we used six landscape units, which were defined by integrating both, the local knowledge of Maya people and literature review. To identify the ecological services that communities perceived from the forest, open and semi-structured interviews, participant observation, depth interviews and community workshops were used. The results show that interviewees identified provisioning services, regulating and maintenance services, and cultural services. In particular, a larger number of ecological services was perceived from the following two landscape units: “high rainforest” (“monte alto”) and the “acahual of 20 or more years-old”, whereas the “Savannah” was identified as the one which least services provided. Moreover, using the development studies theory, our study identified the three dimensions of the concept of “human well-being”: the material, the relational and the subjective dimensions. Furthermore, our study also manages to introduce the relationships of these dimensions with the ecological services perceived by the studied communities. Our results show a clear interaction Maya society-nature, and are useful to guide community and governmental decision-making in the management of local natural resources.


48.
- Artículo con arbitraje
Phosphorus input through fog deposition in a dry tropical forest
Vandecar, Karen L. ; Runyan, Christiane W. (coaut.) ; D’Odorico, Paolo (coaut.) ; Lawrence, Deborah (coaut.) ; Schmook, Birgit Inge (coaut.) ; Das, Rishiraj (coaut.) ;
Contenido en: Journal of Geophysical Research: Biogeosciences Vol. 120, no. 12 (December 2015), p. 2493-2504 ISSN: 2169-8961
Resumen en: Inglés |
Resumen en inglés

In many tropical forests, where phosphorus (P) is considered a limiting nutrient, atmospheric deposition can contribute significantly to available P. Previous studies have shown that P inputs from atmospheric deposition are enhanced by plant canopies. This effect is explained as the result of increased deposition of P-rich aerosol particles (dry deposition) and fog droplets (fog or “occult” deposition) onto leaf surfaces. Here we studied the importance of fog as a source of P to a P-limited dry tropical forest. Throughout an 80 day period during the dry season when fog is most common, we sampled fog water and bulk precipitation in a clearing and measured leaf wetness and throughfall in an adjacent secondary and mature forest stand. During the study period, total P (PT) concentrations in fog water ranged from 0.15 to 6.40 mg/L, on average fourteenfold greater than PT concentrations in bulk precipitation (0.011 to 0.451 mg/L), and sixfold and sevenfold greater than throughfall PT concentrations in the secondary and mature forest stands, respectively (0.007 to 1.319 mg/L; 0.009 to 0.443 mg/L). Based on leaf area index, the frequency of fog deposition, and amount of water deposited per fog event, we estimate that fog delivers a maximum of 1.01 kg/ha/yr to secondary forest stands and 1.75 kg/ha/yr to mature forest stands, compared to 0.88 kg/ha/yr to secondary forest stands and 1.98 kg/ha/yr to mature forest stands via throughfall (wet + dry deposition) and stemflow. Thus, fog deposition may contribute substantially to available P in tropical dry forests.


49.
- Capítulo de libro con arbitraje
Physiological ecology of vascular plants
Valdéz Hernández, Mirna ; González Salvatierra, Claudia (coaut.) ; Reyes García, Casandra (coaut.) ; Jackson, Paula C. (coaut.) ; Andrade, José Luis (coaut.) ;
Contenido en: Biodiversity and conservation of the Yucatan Peninsula New York : Springer International Publishing Switzerland, 2015 p. 97-129 ISBN:978-3-319-06528-1
Resumen en: Inglés |
Resumen en inglés

The Yucatán Peninsula has opposing gradients of precipitation and evaporation from north to south: as precipitation increases, evaporation rates decrease. Also, due to bedrock composed primarily of limestone, the area presents high porosity and rainfall infiltrates quickly, resulting in no superficial runoff. Natural disturbances such as hurricanes and fires are also common. The interaction of these factors has created a mosaic of environmental conditions that has given rise to a series of physiological adaptations in the plant species of the area. This chapter focuses mainly on the morphophysiological responses and adaptations of native plant species of the Yucatán to natural conditions, and on how plants respond to environmental factors at the level of the individual, species, population and/or functional groups. In this chapter, species were grouped according to their metabolic pathway (C3 species or crassulacean acid metabolism species (CAM)), and discussed based on adaptations to limiting resources: water, nutrients, temperature, and light. For C3 species only trees were included, and studies incorporated in this section spanned from plant establishment, growth, water use and water relations, alternative water sources, and carbon and nutrient flow. For the section on CAM the focus was on the factors that affect CAM plants in the microenvironments in which they occur. Other issues analyzed include plant physiological responses to natural disturbances, the potential impact of climate change on plant populations, and gaps in information as well as additional perspectives of study.


50.
Artículo
*En hemeroteca, SIBE-San Cristóbal
Registros nuevos de Orchidaceae para el estado de Tabasco, México
Morales Linares, Jonas ; Toledo Aceves, Mariana Tarin (coaut.) ; Flores Palacios, Alejandro (coaut.) ; Krömer, Thorsten (coaut.) ; García Franco, José G. (coaut.) ;
Contenido en: Revista Mexicana de Biodiversidad Vol. 86, no. 4 (diciembre 2015), p. 1083-1088 ISSN: 1870-3453
Bibliotecas: San Cristóbal
Cerrar
SIBE San Cristóbal
57201-10 (Disponible)
Disponibles para prestamo: 1
Nota: En hemeroteca, SIBE-San Cristóbal
PDF
Resumen en: Español | Inglés |
Resumen en español

Se documentan 7 nuevos registros de orquídeas para la flora del estado de Tabasco, México. La distribución de cada especie fue evaluada para México y el resto del Neotrópico mediante información obtenida de listados florísticos, registros de herbario y herramientas en línea. Finalmente, se discute la importancia del bosque tropical perennifolio como hábitat para la conservación de las orquídeas en un estado severamente alterado por deforestación y cambios en el uso de suelo como Tabasco.

Resumen en inglés

Seven orchid species are reported as new records for the state of Tabasco, Mexico. The distribution of each species was evaluated for Mexicoand the rest of the Neotropics considering data of floristic inventories, herbarium records and online tools. Finally, the importance of the tropical rain forest as habitat for orchid conservation in a severely altered state by deforestation and land use changes as Tabasco is discussed.