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609 resultados encontrados para: TEMA: Yucatán (Península) (México)
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1.
- Artículo de divulgación
Entre la miel y la soya… Conversación con Rogel Villanueva Gutiérrez
López Argoytia, Laura (autora) ;
Disponible en línea
Contenido en: ECOfronteras Volumen 24, número 68 (enero/abril 2020), páginas 34-37 ISSN: 2007-4549
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Resumen en: Español |
Resumen en español

La presente entrevista fue publicada inicialmente en el número 51 de la revista Ecofronteras, en 2014. La ofrecemos nuevamente a nuestra audiencia como un sencillo homenaje a nuestro entrevistado de entonces, Rogel Villanueva Gutiérrez, investigador de El Colegio de la Frontera Sur, quien falleció a finales de 2019. Fue un destacado especialista en diversos temas ligados a las abejas y desarrolló una amplia trayectoria en el impulso a la meliponicultura, actividad que, como su nombre lo dice, se refiere a las abejas meliponas y es una práctica que en México existe desde la época prehispánica como parte de los procesos socioeconómicos y culturales de la población. Sin embargo, su trabajo también se encauzó al estudio de las abejas melíferas, sobre todo en cuanto a su liga con la siembra de soya transgénica en la península de Yucatán. De estos temas nos habló el doctor Villanueva en aquella entrevista. Palabras clave: meliponicultura, apicultura, melipona, soya transgénica, polinización


2.
- Artículo de divulgación
¿Hongos que comen piedras?
Morón Ríos, Alejandro (autor) (1960-) ; Gómez Cornelio, Sergio Alberto (autor) ;
Disponible en línea
Contenido en: ECOfronteras Volumen 24, número 68 (enero/abril 2020), páginas 30-33 ISSN: 2007-4549
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Resumen en: Español |
Resumen en español

Los hongos pueden desarrollarse en todos los ambientes del planeta, son muy diversos y la mayoría son microscópicos, de modo que no todos son vistosos o con “sombrilla”, y definitivamente no son plantas. Son muy abundantes y resultan esenciales en los ecosistemas, por ejemplo, para descomponer materia orgánica muerta; además, muestran capacidades inimaginables, como alimentarse nada menos que de rocas.


3.
Artículo
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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.


4.
- Artículo con arbitraje
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Is captive breeding a priority for manatee conservation in Mexico?
Ortega Argueta, Alejandro (autor) ; Castelblanco Martínez, Delma Nataly (autora) ;
Disponible en línea
Contenido en: Oryx Volume 54, Issue 1 (January 2020), p. 110-117 ISSN: 1365-3008
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Resumen en: Inglés |
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The Endangered Antillean manatee Trichechus manatus manatus is one of the most threatened aquatic mammal species in Mexico and the wider Caribbean region. The decline of this subspecies is mainly a result of historical exploitation and the impact of current coastal development. The conservation strategies adopted for the Antillean manatee include habitat protection, reduction of the most severe threats, and the rescue of stranded, orphaned or injured individuals and their management in captivity. This latter strategy has produced positive outcomes in some countries but has been the subject of controversy in others, including Mexico. We analyse the benefits and challenges associated with the management of captive manatees in Mexico, and the consequences of a lack of government policy and strategy for the post-rehabilitation release of individuals. We describe the evolution of this controversy from 1997-2017 in Mexico, analyse the consequences and implications for the conservation of the species, and propose an integrated management strategy that could address the issues raised. Although this strategy has been developed in the context of Mexico, it is applicable to management of this species across the Caribbean region.


5.
Artículo
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Life history, activity pattern, and morphology of Crotalus tzabcan klauber, 1952 (Serpentes: Viperidae)
Carbajal Márquez, Rubén Alonso (autor) ; Cedeño-Vázquez, J.R. (autor) ; Martins, Marcio (autor) ; Köhler, Gunther (autor) ;
Disponible en línea
Contenido en: Herpetological Conservation and Biology Volumen 15, número 1 (April 2020), p. 228–237 ISSN: 1931-7603
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Resumen en: Inglés |
Resumen en inglés

The Tzabcan Rattlesnake (Crotalus tzabcan) is a highly secretive species that is difficult to observe and follow in the field and any information that can be generated is essential to gain a better understanding of its biology and ecology. Crotalus tzabcan is a large and heavy-bodied species, with a maximum snout-vent length of 1,667 mm and a total length of 1,818 mm. It is endemic to the Yucatán Peninsula, and very little is known about its natural history. We provide data on life history, activity, and morphology based on specimens that we obtained in recent field surveys, museums, and anecdotal observations. Crotalus tzabcan does not present sexual dimorphism in snout-vent length or total length, but males have heads and tails that are significantly longer than females. We observed an ontogenetic color change, where newborns and juveniles had a darker base color and blotches than adults. Crotalus tzabcan showed a unimodal activity pattern with peak activity in the summer. We observed crepuscular and nocturnal activity during the warmer months and diurnal activity during the cooler months. The timing of C. tzabcan reproductive events, based on behavioral evidence and activity, is similar to other pitvipers and rattlesnakes from temperate and tropical zones. We encourage additional research on behavior, physiology, histology, and on how environmental conditions influence life-history traits, to determine the reproductive cycle in both sexes more accurately, which could subsidize conservation strategies.


6.
Artículo
Nest site selection during colony relocation in Yucatan Peninsula populations of the ponerine ants Neoponera villosa (Hymenoptera: Formicidae)
Rocha, Franklin H. (autor) ; Lachaud, Jean Paul (autor) ; Hénaut, Yann (autor) ; Pozo, Carmen (autora) ; Pérez Lachaud, Gabriela (autora) ;
Disponible en línea
Contenido en: Insects Volumen 11, número 3, 200 (March 2020), páginas 1-15 ISSN: 2075-4450
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Resumen en: Inglés |
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In the Yucatan Peninsula, the ponerine ant Neoponera villosa nests almost exclusively in tank bromeliads, Aechmea bracteata. In this study, we aimed to determine the factors influencing nest site selection during nest relocation which is regularly promoted by hurricanes in this area. Using ants with and without previous experience of Ae. bracteata, we tested their preference for refuges consisting of Ae. bracteata leaves over two other bromeliads, Ae. bromeliifolia and Ananas comosus. We further evaluated bromeliad-associated traits that could influence nest site selection (form and size). Workers with and without previous contact with Ae. bracteata significantly preferred this species over others, suggesting the existence of an innate attraction to this bromeliad. However, preference was not influenced by previous contact with Ae. bracteata. Workers easily discriminated between shelters of Ae. bracteata and A. comosus, but not those of the closely related Ae. bromeliifolia. In marked contrast, ants discriminated between similar sized Ae. bracteata and Ae. bromeliifolia plants, suggesting that chemical cues and plant structure play an important role. Size was also significant as they selected the largest plant when provided two dissimilar Ae. bracteata plants. Nest site selection by N. villosa workers seems to depend on innate preferences but familiarization with plant stimuli is not excluded.


7.
Artículo
Water mite diversity (Acariformes: Prostigmata: Parasitengonina: Hydrachnidiae) from karst ecosystems in southern of Mexico: a barcoding approach
Montes Ortiz, Lucia (autora) ; Elías Gutiérrez, Manuel (autor) ;
Disponible en línea
Contenido en: Diversity Volumen 12, número 9, 329 (August 2020), p. 1-16 ISSN: 1424-2818
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Resumen en: Inglés |
Resumen en inglés

Water mites represent the most diverse and abundant group of Arachnida in freshwater ecosystems, with about 6000 species described; however, it is estimated that this number represents only 30% of the total expected species. Despite having strong biotic interactions with their community and having the potential to be exceptional bioindicators, they are frequently excluded from studies of water quality or ecology, due to actual and perceived difficulties of taxonomic identification in this group. The objective of this study is to use the variations in the sequences of the mitochondrial cytochrome oxidase subunit I (COI), also known as the DNA barcodes region, as a tool to assess the diversity of water mites at 24 sites in the Yucatan Peninsula of Mexico. We found 77 genetic groups or putative species corresponding to 18 genera: Arrenurus, Atractides, Centrolimnesia, Eylais, Geayia, Hydrodroma, Hydryphantes, Hygrobates, Koenikea, Krendowskia, Limnesia, Limnochares, Mamersellides, Mideopsis, Neumania, Piona, Torrenticola, and Unionicola. This was significant, since there are only 35 species described for this region. Furthermore, this molecular information has allowed us to infer that there are characteristic assemblies per site. These data will facilitate the incorporation of water mites in different studies while the curatorial work continues to assign a Linnaean name.


8.
- Artículo con arbitraje
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Are Mayan community forest reserves effective in fulfilling people's needs and preserving tree species?
Levy Tacher, Samuel Israel ; Ramírez Marcial, Neptalí (coaut.) (1963-) ; Navarrete Gutiérrez, Darío Alejandro (coaut.) ; Rodríguez Sánchez, Perla Victoria (coaut.) ;
Contenido en: Journal of Environmental Management Vol. 245 (September 2019), p. 16-27 ISSN: 0301-4797
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Resumen en: Inglés |
Resumen en inglés

Mayan community forest reserves (MCFR) play an important role in agricultural landscapes in Mexico, as theyprovide forest products and a broad variety of benefits that contribute to improving local people's livelihoods.Nevertheless, academia has generally considered conservation and use of forest resources to be incompatible. Wedescribe the spatial configuration of MCFR, evaluate floristic and structural characteristics of woody vegetation present in selected reserves, and identify social norms that govern use and conservation of MCFR. These reserves largely consist of mature vegetation (80% of total cover); their plant structure is similar to that of the sur-rounding tropical sub-deciduous forest; and they house a large number of endemic species. The MCFR studied contain a total of 146 tree species and cover 11% of the study area, which includes at least 140 villages in thenorth-central part of the Yucatan Peninsula. These reserves are collectively managed and conserved by Mayanpeasants in the interest of the common good. The communities in our study area combine conservation and useof forest resources, and we recommend that in public policy, government agencies and NGOs incorporate MCFRas a model of biological conservation and sustainable natural resource use, taking into account traditionalknowledge and local norms that allow these reserves to function in a sustainable manner.


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Resumen en: Inglés |
Resumen en inglés

The southern Gulf of Mexico (sGoM) is highly susceptible to receiving environmental impacts due to the recent increase in oil-related activities. In this study, we assessed the changes in the bacterioplankton community structure caused by a simulated oil spill at mesocosms scale. The 16S rRNA gene sequencing analysis indicated that the initial bacterial community was mainly represented by Gamma-proteobacteria, Alpha-proteobacteria, Flavobacteriia, and Cyanobacteria. The hydrocarbon degradation activity, measured as the number of culturable hydrocarbonoclastic bacteria (CHB) and by the copy number of the alkB gene, was relatively low at the beginning of the experiment. However, after four days, the hydrocarbonoclastic activity reached its maximum values and was accompanied by increases in the relative abundance of the well-known hydrocarbonoclastic Alteromonas. At the end of the experiment, the diversity was restored to similar values as those observed in the initial time, although the community structure and composition were clearly di erent, where Marivita, Pseudohongiella, and Oleibacter were detected to have di erential abundances on days eight–14. These changes were related with total nitrogen (p value = 0.030 and r² = 0.22) and polycyclic aromatic hydrocarbons (p value = 0.048 and r² = 0.25), according to PERMANOVA. The results of this study contribute to the understanding of the potential response of the bacterioplankton from sGoM to crude oil spills.


10.
Tesis - Maestría
*En proceso técnico. Solicítelo con el bibliotecario(a) de SIBE-Chetumal
Distribución actual y potencial de Swietenia macrophylla King (caoba) en tres escenarios de cambio climático en México / Gregorio Mario Ramírez Magil
Ramírez Magil, Gregorio Mario ; Navarro Martínez, María Angélica (directora) ; Botello, Francisco (codirector) ; García Ortega, Martha (asesora) ;
Chetumal, Quintana Roo, México : El Colegio de la Frontera Sur , 2019
Clasificación: TE/634.973770972 / R3
Nota: En proceso técnico. Solicítelo con el bibliotecario(a) de SIBE-Chetumal
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Índice | Resumen en: Español |
Resumen en español

Los modelos de nicho ecológico (MNE) permiten determinar la idoneidad de hábitat de las especies vegetales o animales. El objetivo del presente trabajo fue determinar la idoneidad de hábitat de la caoba Swietenia macrophylla King, en tres escenarios de cambio climático en México. Para la modelación se empleó el algoritmo MaxEnt. Como fuente primaria se utilizaron los registros de caoba en el Inventario Nacional Forestal 2009-2014. Los predictores fueron los raster de 19 variables bioclimáticas de las interpolaciones de datos observados y representativos de 1960-1990, 2050 (promedio de 2041 a 2060) y 2070 (promedio de 2061-2080) de Worldclim, con una resolución espacial aproximada a 1 km2 y el raster de edafología de la CONABIO con una resolución espacial de 90 m2. Para el escenario 2050 se proyecta una pérdida de hábitat idóneo del 39.79 %; mientras que para el escenario 2070 esta es de 12.89 % respecto al escenario 2050. Se concluye que en los tres escenarios las condiciones de hábitat idóneo permanecerán principalmente en los estados de Campeche y Quintana Roo, siendo este último el que conservará cerca del 50% del hábitat idóneo. Los resultados contribuyen a la generación de estrategias de conservación, aprovechamiento y mitigación del impacto del cambio climático que aseguren la permanencia de la caoba y los ecosistemas en los que habita.

Índice

1. Resumen y palabras clave
2. Introducción
2.1. Descripción general de la especie
2.2. Importancia ecológica, económica y cultural
2.3. Modelos de distribución
3. Artículo científico sometido para su publicación a la revista Madera y Bosques
4. Conclusiones generales
5. Literatura citada