Términos relacionados

750 resultados encontrados para: AUTOR: Hernández, G.
  • «
  • 1 de 75
  • »
1.
Libro
Estructura del consumo de energía en el medio rural mexicano, Estado de Chiapas / Blanca Mayela Díaz Hernández, ... [et al.]
Díaz Hernández, Blanca Mayela ; Jiménez Ferrer, Guillermo (coaut.) ; Ramírez Avila, Delfino (coaut.) ; Comparán Rodríguez, José M. (coaut.) ; Aguilar López, Manuel (coaut.) ;
San Cristóbal de Las Casas, Chiapas, México : Secretaría de Energía, Minas e Industria Paraestatal , s.f.
Clasificación: EC/333.790727 / E8
Bibliotecas: San Cristóbal
Cerrar
SIBE San Cristóbal
SEE000613 (Disponible)
Disponibles para prestamo: 1

PDF
Resumen en: Español |
Resumen en español

Este libro, pequeño y colorido, es un compendio de fichas didácticas creadas para el huerto educativo de El Colegio de la Frontera Sur en San Cristóbal de Las Casas, Chiapas. Están organizadas según la familia botánica, y llevan una franja de color distinto para cada familia en la parte superior. Así, nos podemos enterar, por ejemplo que aunque parecen muy distintas en nuestros platos, el cilantro, el hinojo y la zanahoria son todas primas. Esto tiene importancia práctica porque las plantas emparentadas muchas veces comparten plagas y enfermedades, así que no conviene combinarlas en un policultivo ni secuencialmente en una rotación. Puedes imprimir éstas fichas y usarlas como material de apoyo para aprender la información que contienen, repartirlas entre visitantes a tu huerto para que busquen las plantas, o incluso convertirlas en etiquetas para tus plantas. ¡Qué las disfrutes!.


3.
Artículo
*Solicítelo con su bibliotecario/a
Applicability of biodiversity databases to regional conservation planning in the tropics: a case study evaluation of the effect of environmental bias on the performance of predictive models of species richness
Vaca Genuit, Raúl Abel (autor) ; Rodiles Hernández, María del Rocío (autora) (1956-) ; Soria Barreto, Miriam (autora) ; Muñoz Alonso, Luis Antonio (autor) ; González Díaz, Alfonso Ángel (autor) ; Castillo Santiago, Miguel Ángel (autor) ;
Disponible en línea
Contenido en: Acta Oecologica Volumen 109, artículo número 103653 (November 2020), páginas 1-13 ISSN: 1146-609X
Nota: Solicítelo con su bibliotecario/a
Resumen en: Inglés |
Resumen en inglés

The biodiversity data typically available for fitting distributional models in the tropics come from museum and scientific collections which are often incomplete and prone to sampling and environmental biases. Nevertheless, most studies undertaken in tropical regions assume that collection data offers a satisfactory environmental coverage without any quantitative assessment. In this study, we investigate the effects of differences in environmental bias and coverage provided by distributional data when aggregated into different grid cell sizes, on the performance of species richness-environment models and predictions. We use an extensive data compilation, including national and regional collections, on the distribution of amphibians, reptiles and fishes in the hydrologic region of the Usumacinta River as a case study. General additive models and environmental variables are used to construct predictive models at 40, 20, 10 and 5 km grid resolutions, based on well-sampled cells. The best multivariate models included nonparametric interaction terms for the effects of precipitation and temperature and suggested an altitudinal shift in the relative importance of energy and water in determining the distribution of species richness.

For fishes, geomorphology accounted for fine scale variation in species richness along the hydrologic network, indicated by peaks in species diversity at the junction of the major rivers where major accumulation of water and sediments occurs. For all taxonomic groups, we found that sampling biases deviated most from the mean bias at the extremes of gradients accounting for important environmental factors. The pattern of environmental bias changed with grid size, with the form and amount of change being casespecific. Biases affected distribution predictions when compared with unbiased datasets. Moreover, not all models resulted best at coarser resolution as it is commonly assumed. Our results demonstrate that bias in the available data must be evaluated before mapping biodiversity distributions, irrespective of the choice of scale.


4.
- Artículo con arbitraje
PDF
Resumen en: Inglés |
Resumen en inglés

The West Indian fruit fly, Anastrepha obliqua (Macquart), is the second most important tephritid fruit fly in Mexico, infesting mango, hog plum and guava fruits. To control this pest, the Mexican government has implemented the use of the sterile insect technique (SIT), which involves the mass production, sterilization and release of flies. However, the A. obliqua laboratory males used in SIT are selected to a lesser extent by the wild females during competitiveness tests. The objective of this study was to compare the effects of males fed on fruit fly food enriched with Providencia rettgeri to those in males fed on food alone, assessing male mating competitiveness, capture of females using traps baited with males fed with the enriched diet and sex pheromone components. The results indicated that males fed with the diet enriched with P. rettgeri had increased mating competitiveness and captured more females in the field cage tests. However, no difference was observed in the proportion of volatile sex pheromone components identified during the calling of A. obliqua males. The results suggest the value of incorporating bacteria into the mass rearing technique of A. obliqua adults in order to improve the sexual competitiveness of males from the laboratory compared to wild males.


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

Natural Protected Areas (NPAs) are consider adequate tools for biodiversity conservation. Currently in Mexico there are 182 federal NPAs classified according to their management objectives. Chiapas is the Mexican state with the highest number of decreed NPAs and also allocates one of the largest territorial extensions for its protection. Unlike other taxa, and despite their proven ability to respond to ecosystem changes, the study of dung beetles within Mexican NPAs has been underestimated, as they are not considered as a priority group within their management and conservation programs. Based on the review of information available in publications and database on dung beetles, a list of 112 species and seven subspecies recorded in 16 of the 19 federal NPAs established in Chiapas is presented.

The species recorded by each NPA show a significant correlation with the number of publications, but a low percentage of them correspond to studies with systematic samplings and most of the species reported in several of the NPAs come from sporadic records, which prevents the study of several basic and applied aspects of dung beetles in the region. Therefore, studies that extensively analyze the communities of arthropod groups, such as the Scarabaeinae, are necessary to understand their response to changes in the ecosystem at local and regional scale. It is advisable that these insects be included in the previous justifying studies for the designation or establishment of NPAs and, in turn, considered in the biological monitoring programs of these areas for their capacity as a bioindicator group.


6.
- Artículo con arbitraje
Historia y caracterización técnica y socioeconómica de la ganadería bovina en la costa de Chiapas, México
Rodríguez Moreno, Orquidia Guadalupe (autora) ; Nahed Toral, José (autor) ; Guevara Hernández, Francisco (autor) ; Alayón Gamboa, José Armando (autor) ; Grande Cano, Jesús Daniel (autor) ;
Disponible en línea
Contenido en: Tropical and Subtropical Agroecosystems Vol. 23, no. 55 (2020), p. 1-13 ISSN: 1870-0462
PDF PDF
Resumen en: Español | Inglés |
Resumen en español

Antecedentes: Actualmente se necesita que los sistemas de producción agropecuarios produzcan mayor cantidad de alimentos, en el menor tiempo posible, y a la vez conserven los recursos naturales. Entre las iniciativas que se han implementado, los sistemas agrosilvopastoriles son una estrategia viable con respecto a la ganadería extensiva. Objetivo: Se caracteriza la trayectoria histórica y algunos indicadores técnicos y socioeconómicos de la ganadería bovina con prácticas extensiva y agrosilvopastoril en el municipio de Pijijiapan, Chiapas. Metodología: La información se obtuvo mediante entrevista a profundidad con informantes clave, revisión documental, entrevista semiestructurada y observación directa en 35 unidades de producción ganaderas (UPG). La información cualitativa se organizó cronológicamente y se presenta de forma descriptiva y narrativa. Los datos cuantitativos se analizaron mediante conglomerados de k medias de acuerdo con un Índice de aporte de Servicios Agroecosistémicos Ganadero (ISAGAN) de las UPG. La información se examinó mediante análisis de varianza y prueba no paramétrica de Kruskal Wallis, para identificar diferencias entre conglomerados. Resultados: La trayectoria histórica, permite identificar tres etapas importantes: i) el periodo colonial, pre-ganadero con poca intervención antrópica antes del año 1900; ii) el periodo de desarrollo productivo desde los años 1900 hasta 1955 y iii) el periodo de expansión de la ganadería extensiva, desde 1955, con fuertes impactos ambientales, y surge el manejo agrosilvopastoril como alternativa sustentable a la ganadería extensiva.

Implicaciones: La ganadería en pastoreo se caracteriza por un gradiente de arborización, escaso grado de desarrollo tecnológico, bajo uso de insumos externos y uso integral y diversificado de los recursos. Conclusiones: De 26 indicadores técnicos y socioeconómicos evaluados, asistencia técnica fue el único que presentó diferencia (p< 0.05) entre conglomerados, donde al incrementarse los valores de dicho indicador, también aumentan los del ISAGAN.

Resumen en inglés

At the present, agricultural production systems need to produce more food, in the shortest possible time, and at the same time conserve natural resources. Among the initiatives that have been implemented, agrosilvopastoral systems are a viable strategy with regard to extensive livestock. Objective: We characterize the historical trajectory as well as technical and socioeconomic indicators of cattle raising using extensive and agrosilvopastoral practices in the municipality of Pijijiapan, Chiapas, Mexico. Methodology: Information was obtained through in-depth interviews with key informants, documentary review, semi-structured interviews, and direct observation in 35 livestock production units (LPU). Qualitative information was organized chronologically and presented in a descriptive, narrative manner. Quantitative data were analyzed using a K-means cluster analysis according to a Livestock Agroecosystem Services Index (ISAGAN according to its Spanish initials) of the LPU. Information was examined using analysis of variance and a non-parametric Kruskal-Wallis test in order to identify differences among clusters. Results: Three important stages were identified in the historical trajectory: i) a colonial, pre-livestock raising period with little anthropic intervention, prior to 1900; ii) a period of productive development of livestock raising, from 1900 to 1955, and iii) a period of expansion of extensive livestock raising, beginning in 1955, with significant environmental impacts. More recently, agrosilvopastoral management has been presented as a sustainable alternative to extensive livestock raising.

Implications: Livestock raising based on grazing is characterized by a tree gradient, a low level of technological development, low use of external inputs, and holistic diversified resource use. Conclusion: Of 26 technical and socioeconomic indicators evaluated, technical advisory was the only one which varied (p< 0.05) among clusters; upon increasing the values of this indicator, ISAGAN also increased.


7.
Artículo
Jardín botánico y arboretum: estrategias de conservación forestal en paisajes antropizados del trópico mexicano
Esparza Olguín, Ligia Guadalupe (autora) ; Maya Martínez, Aixchel (autora) ; Hernández García, Gonzalo (autor) ; Martínez Romero, Eduardo (autor) ;
Disponible en línea
Contenido en: Revista Mexicana de Ciencias Forestales Volumen 11, número 60 (julio-agosto 2020), p. 50-77 ISSN: 2007-1132
PDF
Resumen en: Español | Inglés |
Resumen en español

Los jardines botánicos y arboreta son considerados instrumentos de conservación relevantes a partir de las alarmantes tasas de deforestación que tienen las selvas y la consecuente afectación de su diversidad. En este trabajo se analizó la diversidad, el estatus de conservación y el uso po tencial de las especies arbóreas en el jardín botánico (JB) y el arboretum (A) del Centro de Investigación y Transferencia de Tecnología Forestal El Tormento. En el primero, el muestreo se realizó en un área total de 9 375 m²; mientras que, en el segundo el muestreo se hizo en 1.6 ha. Ambos espacios representan vegetación de selva mediana subperennifolia, con 11 871 individuos pertenecientes a 92 especies y 35 familias. El JB fue 1.6 veces más diverso que A. Se documentaron 15 usos potenciales en 98.9% de los taxones con al menos un uso registrado. Entre los taxa de ambas colecciones, se tienen siete clasificadas en la lista roja de la IUCN, dos en CITES y ocho en la NOM-059-SEMARNAT-2010. Estos resultados subrayan la importancia del jardín botánico y el arboretum como reservorios de especies forestales útiles desde muy diversas perspectivas y como espacios de conservación de taxa amenazados de las selvas medianas subperennifolias del sur de México.

Resumen en inglés

Botanical gardens and arboreta are considered relevant conservation instruments based on the alarming deforestation rates that forests have and the consequent impact on their diversity. In this paper, the diversity, conservation status and potential use of tree species in the botanical garden (JB) and arboretum (A) of the El Tormento Forest Technology Research and Transfer Center were a nalyzed. In the first, the sampling was carried out in a total area of 9 375 m²; while in the second the sampling was done in 1.6 ha. Both spaces represent vegetation of medium sub-evergreen forest, with 11 871 individuals which belong to 92 species and 35 families. JB was 1.6 times more diverse than A. 15 potential uses were documented in 98.9 % of the species with at least one registered use. Among the species in both collections, there are seven classified in the IUCN red list, two in CITES and eight in the NOM-059-SEMARNAT-2010. These results underscore the importance of the botanical garden and the arboretum as reservoirs of useful forest species from many different perspectives and as conservation spaces for threatened taxa from the medium-long sub-evergreen forests of southern Mexico.


8.
Artículo
Resumen en: Inglés |
Resumen en inglés

Premise: Domestication usually involves local adaptation to environmental conditions. Cucurbita species are a promising model for studying these processes. Cucurbita moschata is the third major crop in the genus because of its economic value and because it displays high landrace diversity, but research about its genetic diversity, population structure, and phylogeography is limited. We aimed at understanding how geography and elevation shape the distribution of genetic diversity in C. moschata landraces in Mexico. Methods: We sampled fruits from 24 localities throughout Mexico. We assessed 11 nuclear microsatellite loci, one mtDNA region, and three cpDNA regions but found no variation in cpDNA. We explored genetic structure with cluster analysis, and phylogeographic relationships with haplotype network analysis. Results: Mitochondrial genetic diversity was high, and nuclear genetic differentiation among localities was intermediate compared to other domesticated Cucurbita. We found high levels of inbreeding. We recovered two mitochondrial lineages: highland (associated with the Trans-Mexican Volcanic Belt) and lowland. Nuclear microsatellites show that localities from the Yucatan Peninsula constitute a well-differentiated group. Conclusions: Mexico is an area of high diversity for C. moschata, and these landraces represent important plant genetic resources. In Mexico this species is characterized by divergence processes linked to an elevational gradient, which could be related to adaptation and may be of value for applications in agriculture. The Isthmus of Tehuantepec may be a partial barrier to gene flow. Morphological variation, agricultural management, and cultural differences may be related to this pattern of genetic structure, but further studies are needed.


9.
Artículo
*Solicítelo con su bibliotecario/a
Population status, connectivity, and conservation action for the endangered Baird's tapir
Schank, Cody J. (autor) ; Cove, Michael V. (autor) ; Arima, Eugenio Y. (autor) ; Brandt, Laroy S. E. (autor) ; Brenes Mora, Esteban (autor) ; Carver, Andrew (autor) ; Diaz Pulido, Angelica (autora) ; Estrada, Nereyda (autora) ; Foster, Rebecca J. (autora) ; Godínez Gómez, Oscar (autor) ; Harmsen, Bart J. (autor) ; Jordan, Christopher A. (autor) ; Keitt, Timothy H. (autor) ; Kelly, Marcella J. (autora) ; Sáenz Méndez, Joel (autor) ; Mendoza Ramírez, Eduardo (autor) ; Meyer, Ninon France Victoire (autora) ; Pozo Montuy, Gilberto (autor) ; Naranjo Piñera, Eduardo Jorge (autor) (1963-) ; Nielsen, Clayton K. (autor) ; O´Farril Cruz, Elsa Georgina (autora) ; Reyna Hurtado, Rafael Ángel (autor) ; Rivero Hernández, Crysia Marina (autora) ; Carvajal Sánchez, José Pablo (autor) ; Singleton, Maggie (autora) ; Torre, J. Antonio de la (autor) ; Wood, Margot A. (autora) ; Young, Kenneth R. (autor) ; Miller, Jennifer A. (autora) ;
Disponible en línea
Contenido en: Biological Conservation Volumen 245, número 108501 (May 2020), p. 1-12 ISSN: 0006-3207
Nota: Solicítelo con su bibliotecario/a
Resumen en: Inglés |
Resumen en inglés

Although many large mammals currently face significant threats that could lead to their extinction, resources for conservation are often scarce, resulting in the need to develop efficient plans to prioritize conservation actions. We combined several methods in spatial ecology to identify the distribution of the endangered Baird's tapir across its range from southern Mexico to northern Colombia. Twenty-eight habitat patches covering 23% of the study area were identified, harboring potentially 62% or more of the total population for this flagship species. Roughly half of the total area is under some form of protection, while most of the remaining habitat (~70%) occurs in indigenous/local communities. The network with maximum connectivity created from these patches contains at least one complete break (in Mexico between Selva El Ocote and Selva Lacandona) even when considering the most generous dispersal scenario. The connectivity analysis also highlighted a probable break at the Panama Canal and high habitat fragmentation in Honduras. In light of these findings, we recommend the following actions to facilitate the conservation of Baird's tapir: 1) protect existing habitat by strengthening enforcement in areas already under protection, 2) work with indigenous territories to preserve and enforce their land rights, and help local communities maintain traditional practices; 3) re-establish connections between habitat patches that will allow for connectivity across the species' distribution; 4) conduct additional noninvasive surveys in patches with little or no species data; and 5) collect more telemetry and genetic data on the species to estimate home range size, dispersal capabilities, and meta-population structure.


10.
Artículo
*Solicítelo con su bibliotecario/a
Precipitous decline of white-lipped peccary populations in Mesoamerica
Thornton, Daniel (autor) ; Reyna Hurtado, Rafael Ángel (autor) ; Perera Romero, Lucy (autora) ; Radachowsky, Jeremy (autor) ; Hidalgo Mihart, Mircea Gabriel (autor) ; García Anleu, Rony (autor) ; McNab, Roan (autor) ; Mcloughlin, Lee (autor) ; Foster, Rebecca (autora) ; Harmsen, Bart (autor) ; Moreira Ramírez, José Fernando (autor) ; Diaz Santos, Fabricio (autor) ; Jordan, Christopher A. (autor) ; Salom Pérez, Roberto (autor) ; Meyer, Ninon France Victoire (autor) ; Castañeda, Franklin (autor) ; Elvir Valle, Fausto Antonio (autor) ; Ponce Santizo, Gabriela (autora) ; Amit, Ronit (autora) ; Arroyo Arce, Stephanny (autora) ; Thomson, Ian (autor) ; Moreno, Ricardo (autor) ; Schank, Cody J. (autor) ; Arroyo Gerala, Paulina (autora) ; Bárcenas, Horacio V. (autor) ; Brenes Mora, Esteban (autor) ; Calderón, Ana Patricia (autora) ; Cove, Michael V. (autor) ; Gómez Hoyos, Diego (autor) ; González Maya, José F. (autor) ; Guy, Danny (autor) ; Hernández Jiménez, Gerobuam (autor) ; Hofman, Maarten (autor) ; Kays, Roland (autor) ; King, Travis (autor) ; Martinez Menjivar, Marcio Arnoldo (autor) ; Maza, Javier de la (autor) ; León Pérez, Rodrigo (autor) ; Ramos, Víctor Hugo (autor) ; Rivero Hernández, Crysia Marina (autora) ; Romo Asunción, Sergio (autor) ; Juárez López, Rugieri (autor) ; Jesús de la Cruz, Alejandro (autor) ; De la Torre, Jesús Antonio (autor) ; Towns, Valeria (autora) ; Schipper, Jan (autor) ; Portillo Reyes, Hector Orlando (autor) ; Artavia, Adolfo (autor) ; Hernández Pérez, Edwin Luis Oswaldo (autor) ; Martínez, Wilber (autor) ; Urquhart, Gerald R. (autor) ; Quigley, Howard (autor) ; Pardo, Lain E. (autor) ; Sáenz, Joel C. (autor) ; Sanchez, Khiavett (autora) ; Polisar, John (autor) ;
Contenido en: Biological Conservation Vol. 242, no. 108410 (2020), p. 1-12 ISSN: 0006-3207
Nota: Solicítelo con su bibliotecario/a
Resumen en: Inglés |
Resumen en inglés

Large mammalian herbivores are experiencing population reductions and range declines. However, we lack regional knowledge of population status for many herbivores, particularly in developing countries. Addressing this knowledge gap is key to implementing tailored conservation strategies forspecies whose population declines are highly variable across their range. White-lipped peccaries (Tayassupecari) are important ecosystem engineers in Neotropical forests and are highly sensitive to human disturbance. Despite maintaining a wide distributional range, white-lipped peccaries are experiencing substantial population declines in some portions of their range.We examined the regional distribution and population status of the species in Mesoamerica. We used a combination of techniques, including expert-based mapping and assessment of population status, and data-driven distribution modelling techniques to determine the status and range limits of white-lipped peccaries. Our analysis revealed declining and highly isolated populations of peccaries across Mesoamerica, with a range reduction of 87% from historic distribution and 63% from current IUCN range estimates for the region. White-lipped peccary distribution is affected by indices of human influence and forest cover, and more restricted than other sympatric large herbivores, with their largest populations confined to transboundary reserves. To conserve white-lipped peccaries in Mesoamerica, transboundary efforts will be needed that focus on both forest conservation and hunting management, increased cross-border coordination, and reconsideration of country and regional conservation priorities. Our methodology to detail regional white-lipped peccary status could be employed on other poorly-known large mammals.