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20 resultados encontrados para: AUTOR: Flores Villela, Oscar Alberto
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1.
- Artículo con arbitraje
Distribution and abundance of the Central American river turtle, Dermatemys Mawii, in southern Quintana Roo, Mexico: implications for a regional conservation strategy
Calderón Mandujano, Romel René ; Hernández Arana, Héctor Abuid (coaut.) ; Flores Villela, Oscar Alberto (coaut.) ;
Contenido en: Journal of Biodiversity & Endangered Species Vol. 5, no. 3, 1000198 (September 2017), p. 1-6 ISSN: 2332-2543
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Resumen en: Inglés |
Resumen en inglés

We estimated the distribution and abundance of the Central American River Turtle, Dermatemys mawii, in four aquatic systems in southern Quintana Roo, Mexico. Using nets and free diving we captured 52 individuals D. mawii among the winter, dry and rainy seasons. We recorded 12 variables to characterize the habitat and correlated these with the abundance of D. mawii. Using catching per unit effort, we evaluated the species’ relative abundance for each aquatic system. Using Maxent, we modeled the potential distribution of D. mawii using historical and present locality data. We recorded 81 D. mawii individuals using systematic sampling and casual observations. La Union was the site with the highest relative abundance (~4 ind.-net). We found a negative correlation between D. mawii abundance and salinity. The model of potential distribution identified sites with ecological conditions suitable for the species where it is undocumented. Information about the ecology of this species remains scarce, but we propose that identifying management units could improve conservation of the species at local and regional levels.


2.
- Artículo con arbitraje
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Resumen en: Inglés |
Resumen en inglés

Standard karyotypes of two species of the genus Scincella, S. assata and S. cherriei, both from Chiapas State, Mexico, were described for the first time. The diploid chromosome number was 28 in S. assata, whereas 30 in S. cherriei. The karyotypes of the two species, while differing in the number of microchromosomes, 14-15 in S. assata and 16-17 in S. cherriei, share four pairs of large metacentric, two pairs of medium-sized metacentric, and one particular pair (number 7) of chromosomes. Female S. assata carries chromosome pair 7 composed of two identical medium-sized subtelocentric chromosomes. This chromosome pair is heteromorphic in males of both species, i.e., one component of the pair is similar to the homomorphic chromosomes 7 of the S. assata female, while the other is nearly one-half the size of its counterpart and resembles a microchromosome. The homology of such externally different elements is deducted from the presence of an asymmetric bivalent in spermatocytes at diplotene-diakinesis. Female S. cherriei was not available. We suspect that the two Scincella species possess an XY sex determination system, as previously reported for the North American congeneric species, S. lateralis.


3.
- Artículo con arbitraje
*Solicítelo con su bibliotecario/a
The conservation status of the world’s reptiles
Böhm, Monika ; Collen, Ben (coaut.) ; Baillie, Jonathan E. M. (coaut.) ; Bowles, Philip (coaut.) ; Chanson, Janice (coaut.) ; Cox, Neil (coaut.) ; Hammerson, Geoffrey (coaut.) ; Hoffmann, Michael (coaut.) ; Livingstone, Suzanne R. (coaut.) ; Ram, Mala (coaut.) ; Rhodin, Anders G. J. (coaut.) ; Stuart, Simon N. (coaut.) ; van Dijk, Peter Paul (coaut.) ; Young, Bruce E. (coaut.) ; Afuang, Leticia E. (coaut.) ; Aghasyan, Aram (coaut.) ; García, Andrés (coaut.) ; Aguilar, César (coaut.) ; Ajtic, Rastko (coaut.) ; Akarsu, Ferdi (coaut.) ; Alencar, Laura R.V. (coaut.) ; Allison, Allen (coaut.) ; Ananjeva, Natalia (coaut.) ; Anderson, Steve (coaut.) ; Andrén, Claes (coaut.) ; Ariano Sánchez, Daniel (coaut.) ; Arredondo, Juan Camilo (coaut.) ; Auliya, Mark (coaut.) ; Austin, Christopher C. (coaut.) ; Avci, Aziz (coaut.) ; Baker, Patrick J. (coaut.) ; Barreto Lima, André F. (coaut.) ; Barrio Amorós, César L. (coaut.) ; Basu, Dhruvayothi (coaut.) ; Bates, Michael F. (coaut.) ; Batistella, Alexandre (coaut.) ; Bauer, Aaron (coaut.) ; Bennett, Daniel (coaut.) ; Böhme, Wolfgang (coaut.) ; Broadley, Don (coaut.) ; Brown, Rafe (coaut.) ; Burgess, Joseph (coaut.) ; Captain, Ashok (coaut.) ; Carreira, Santiago (coaut.) ; Castañeda, Maria del Rosario (coaut.) ; Castro, Fernando (coaut.) ; Catenazzi, Alessandro (coaut.) ; Cedeño-Vázquez, J.R. (coaut.) ; Chapple, David G. (coaut.) ; Cheylan, Marc (coaut.) ; Cisneros Heredia, Diego F. (coaut.) ; Cogalniceanu, Dan (coaut.) ; Cogger, Hal (coaut.) ; Corti, Claudia (coaut.) ; Costa, Gabriel C. (coaut.) ; Couper, Patrick J. (coaut.) ; Courtney, Tony (coaut.) ; Crnobrnja Isailovic, Jelka (coaut.) ; Crochet, Pierre André (coaut.) ; Crother, Brian (coaut.) ; Cruz, Felix (coaut.) ; Daltry, Jennifer C. (coaut.) ; Ranjit Daniels, R. J. (coaut.) ; Das, Indraneil (coaut.) ; Silva, Anslemde (coaut.) ; Diesmos, Arvin C. (coaut.) ; Dirksen, Lutz (coaut.) ; Doan, Tiffany M. (coaut.) ; Dodd Jr., C. Kenneth (coaut.) ; Doody, J. Sean (coaut.) ; Dorcas, Michael E. (coaut.) ; Barros Filho, Jose Duarte de (coaut.) ; Egan, Vincent T. (coaut.) ; El Mouden, El Hassan (coaut.) ; Embert, Dirk (coaut.) ; Espinoza, Robert E. (coaut.) ; Fallabrino, Alejandro (coaut.) ; Feng, Xie (coaut.) ; Feng, Zhao Jun (coaut.) ; Fitzgerald, Lee (coaut.) ; Flores Villela, Oscar Alberto (coaut.) ; França, Frederico G. R. (coaut.) ; Frost, Darrell (coaut.) ; Gadsden, Hector (coaut.) ; Gamble, Tony (coaut.) ; Ganesh, S. R. (coaut.) ; Garcia, Miguel A. (coaut.) ; García Pérez, Juan E. (coaut.) ; Gatus, Joey (coaut.) ; Gaulke, Maren (coaut.) ; Geniez, Philippe (coaut.) ; Georges, Arthur (coaut.) ; Gerlach, Justin (coaut.) ; Goldberg, Stephen (coaut.) ; T. Gonzalez, Juan Carlos (coaut.) ; Gower, David J. (coaut.) ; Grant, Tandora (coaut.) ; Greenbaum, Eli (coaut.) ; Grieco, Cristina (coaut.) ; Guo, Peng (coaut.) ; Hamilton, Alison M. (coaut.) ; Hare, Kelly (coaut.) ; Blair Hedges, S. (coaut.) ; Heideman, Neil (coaut.) ; Hilton Taylor, Craig (coaut.) ; Hitchmough, Rod (coaut.) ; Hollingsworth, Bradford (coaut.) ; Hutchinson, Mark (coaut.) ; Ineich, Ivan (coaut.) ; Iverson, John (coaut.) ; Jaksic, Fabian M. (coaut.) ; Jenkins, Richard (coaut.) ; Joger, Ulrich (coaut.) ; Jose, Reizl (coaut.) ; Kaska, Yakup (coaut.) ; Kaya, Uğur (coaut.) ; Scott Keogh, J. (coaut.) ; Köhler, Gunther (coaut.) ; Kuchling, Gerald (coaut.) ; Kumlutas, Yusuf (coaut.) ; Kwet, Axel (coaut.) ; La Marca, Enrique (coaut.) ; Lamar, William (coaut.) ; Lane, Amanda (coaut.) ; Lardner, Bjorn (coaut.) ; Latta, Craig (coaut.) ; Latta, Gabrielle (coaut.) ; Lau, Michael (coaut.) ; Lavin, Pablo (coaut.) ; Lawson, Dwight (coaut.) ; LeBreton, Matthew (coaut.) ; Lehr, Edgar (coaut.) ; Limpus, Duncan (coaut.) ; Lipczynski, Nicola (coaut.) ; Lobo, Aaron S. (coaut.) ; López Luna, Marco Antonio (coaut.) ; Luiselli, Luca (coaut.) ; Lukoschek, Vimoksalehi (coaut.) ; Lundberg, Mikael (coaut.) ; Lymberakis, Petros (coaut.) ; Macey, Robert (coaut.) ; Magnusson, William E. (coaut.) ; Mahler, D. Luke (coaut.) ; Malhotra, Anita (coaut.) ; Mariaux, Jean (coaut.) ; Maritz, Bryan (coaut.) ; V. Marques, Otavio A. (coaut.) ; Márquez, Rafael (coaut.) ; Martins, Marcio (coaut.) ; Masterson, Gavin (coaut.) ; Mateo, José A. (coaut.) ; Mathew, Rosamma (coaut.) ; Mathews, Nixon (coaut.) ; Mayer, Gregory (coaut.) ; McCranie, James R. (coaut.) ; Measey, G. John (coaut.) ; Mendoza Quijano, Fernando (coaut.) ; Menegon, Michele (coaut.) ; Métrailler, Sébastien (coaut.) ; Milton, David A. (coaut.) ; Montgomery, Chad (coaut.) ; A. Morato, Sérgio A. (coaut.) ; Mott, Tami (coaut.) ; Muñoz Alonso, Luis Antonio (coaut.) ; Murphy, John (coaut.) ; Nguyen, Truong Q. (coaut.) ; Nilson, Göran (coaut.) ; Nogueira, Cristiano (coaut.) ; Núñez, Herman (coaut.) ; Orlov, Nikolai (coaut.) ; Ota, Hidetoshi (coaut.) ; Ottenwalder, José (coaut.) ; Papenfuss, Theodore (coaut.) ; Pasachnik, Stesha (coaut.) ; Passos, Paulo (coaut.) ; G. Pauwels, Olivier S. (coaut.) ; Pérez Buitrago, Néstor (coaut.) ; Pérez Mellado, Valentín (coaut.) ; Pianka, Eric R. (coaut.) ; Pleguezuelos, Juan (coaut.) ; Pollock, Caroline (coaut.) ; Ponce Campos, Paulino (coaut.) ; Powell, Robert (coaut.) (1948-) ; Pupin, Fabio (coaut.) ; Quintero Díaz, Gustavo Ernesto (coaut.) ; Radder, Raju (coaut.) ; Ramer, Jan (coaut.) ; Rasmussen, Arne R. (coaut.) ; Raxworthy, Chris (coaut.) ; Reynolds, Robert (coaut.) ; Richman, Nadia (coaut.) ; Rico, Edmund L. (coaut.) ; Riservato, Elisa (coaut.) ; Rivas, Gilson (coaut.) ; da Rocha, Pedro L.B. (coaut.) ; Rödel, Mark Oliver (coaut.) ; Rodríguez Schettino, Lourdes (coaut.) ; Roosenburg, Willem M. (coaut.) ; Ross, James Perran (coaut.) ; Sadek, Riyad (coaut.) ; Sanders, Kate (coaut.) ; Santos Barrera, Georgina (coaut.) ; Schleich, Hermann H. (coaut.) ; Schmidt, Benedikt R. (coaut.) ; Schmitz, Andreas (coaut.) ; Sharifi, Mozafar (coaut.) ; Shea, Glenn (coaut.) ; Shi, Hai Tao (coaut.) ; Shine, Richard (coaut.) ; Sindaco, Roberto (coaut.) ; Slimani, Tahar (coaut.) ; Somaweera, Ruchira (coaut.) ; Spawls, Steve (coaut.) ; Stafford, Peter (coaut.) ; Stuebing, Rob (coaut.) ; Sweet, Sam (coaut.) ; Sy, Emerson (coaut.) ; Temple, Helen J. (coaut.) ; Tognelli, Marcelo F. (coaut.) ; Tolley, Krystal (coaut.) ; Tolson, Peter J. (coaut.) ; Tuniyev, Boris (coaut.) ; Tuniyev, Sako (coaut.) ; Üzüm, Nazan (coaut.) ; van Buurt, Gerard (coaut.) ; Van Sluys, Monique (coaut.) ; Velasco, Alvaro (coaut.) ; Vences, Miguel (coaut.) ; Vesely, Milan (coaut.) ; Vinke, Sabine (coaut.) ; Vinke, Thomas (coaut.) ; Vogel, Gernot (coaut.) ; Vogrin, Milan (coaut.) ; Vogt, Richard C. (coaut.) ; Wearn, Oliver R. (coaut.) ; Werner, Yehudah L. (coaut.) ; Whiting, Martin J. (coaut.) ; Wiewandt, Thomas (coaut.) ; Wilkinson, John (coaut.) ; Wilson, Byron (coaut.) ; Wren, Sally (coaut.) ; Zamin, Tara (coaut.) ; Zhou, Kaiya (coaut.) ; Zug, George (coaut.) ;
Contenido en: Biological Conservation Vol. 157, (January 2013), p. 372–385 ISSN: 0006-3207
Bibliotecas: San Cristóbal
Cerrar
SIBE San Cristóbal
37364-20 (Disponible)
Disponibles para prestamo: 1
Nota: Solicítelo con su bibliotecario/a
Resumen en: Inglés |
Resumen en inglés

Effective and targeted conservation action requires detailed information about species, their distribution, systematics and ecology as well as the distribution of threat processes which affect them. Knowledge of reptilian diversity remains surprisingly disparate, and innovative means of gaining rapid insight into the status of reptiles are needed in order to highlight urgent conservation cases and inform environmental policy with appropriate biodiversity information in a timely manner. We present the first ever global analysis of extinction risk in reptiles, based on a random representative sample of 1500 species (16% of all currently known species). To our knowledge, our results provide the first analysis of the global conservation status and distribution patterns of reptiles and the threats affecting them, highlighting conservation priorities and knowledge gaps which need to be addressed urgently to ensure the continued survival of the world’s reptiles. Nearly one in five reptilian species are threatened with extinction, with another one in five species classed as Data Deficient. The proportion of threatened reptile species is highest in freshwater environments, tropical regions and on oceanic islands, while data deficiency was highest in tropical areas, such as Central Africa and Southeast Asia, and among fossorial reptiles. Our results emphasise the need for research attention to be focussed on tropical areas which are experiencing the most dramatic rates of habitat loss, on fossorial reptiles for which there is a chronic lack of data, and on certain taxa such as snakes for which extinction risk may currently be underestimated due to lack of population information. Conservation actions specifically need to mitigate the effects of human-induced habitat loss and harvesting, which are the predominant threats to reptiles.


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

Background: Neotropical lizards, genus Anolis (Polychrotidae), with nearly 380 species, are members of one of the most diversified genera among amniotes. Herein, we present an overview of chromosomal evolution in ‘beta’ Anolis (of the Norops group) as a baseline for future studies of the karyotypic evolution of anoles. We evaluated all available information concerning karyotypes of Norops, including original data on a recently described species, Anolis unilobatus. We used the phylogeny of Norops based on DNA sequence data to infer the main pattern of chromosomal evolution by means of an ancestral state analysis (ASR). Results: We identified 11 different karyotypes, of which 9 in the species had so far been used in molecular studies. The ASR indicated that a change in the number of microchromosomes was the first evolutionary step, followed by an increase in chromosome numbers, likely due to centric fissions of macrochromosomes. The ASR also showed that in nine species, heteromorphic sex chromosomes most probably originated from six independent events. Conclusions: We observed an overall good correspondence of some characteristics of karyotypes and species relationships. Moreover, the clade seems prone to sex chromosome diversification, and the origins of five of these heteromorphic sex chromosome variants seem to be recent as they appear at the tip nodes in the ancestral character reconstruction. Karyotypic diversification in Norops provides an opportunity to test the chromosomal speciation models and is expected to be useful in studying relationships among anole species and in identifying cryptic taxa.


5.
Artículo
Choosing the survivors? A GIS-based triage support tool for micro-endemics: application to data for Mexican amphibians
Ochoa Ochoa, Leticia Margarita ; Bezaury Creel, Juan E. (coaut.) ; Vázquez Hernández, Luis Bernardo (coaut.) ; Flores Villela, Oscar Alberto (coaut.) ;
Contenido en: Biological Conservation Vol. 144, no. 11 (November 2011), p. 2710-2718 ISSN: 0006-3207
Resumen en: Inglés |
Resumen en inglés

Given the current speed of land use change, we cannot expect to save all species from extinction, and so must decide how to focus limited resources to prevent the greatest number of extinctions. This paper proposes a simple conservation triage method that: evaluates the threat status for 145 micro-endemic Mexican amphibian species; assesses current potential threat abatement responses derived from existing policy instruments and social initiatives; and combines both indicators to provide broad-scale conservation strategies that would best suit amphibian micro-endemic buffered areas (AMBAs) in Mexico. To prioritize the AMBAs we used existing and newly compiled spatial databases of territorial conservation instruments, threats, and amphibian range distributions for Mexico. We identify 50% of Mexican micro-endemic amphibians as requiring urgent actions. Based on the location of the AMBAs and using existing conservation instruments, we develop a conservation strategy for the majority of these species. However, almost 25% urgently need field-base verification to confirm their persistence due to the small percentage of remnant natural vegetation within the AMBAs, before we may sensibly recommend such a strategy.


6.
- Capítulo de libro con arbitraje
*Solicítelo con su bibliotecario/a
Priorización de áreas para conservación de la herpetofauna utilizando diferentes métodos de selección
Ochoa Ochoa, Leticia ; Vázquez Hernández, Luis Bernardo (coaut.) ; Urbina Cardona, Nicolás J. (coaut.) ; Flores Villela, Oscar Alberto (coaut.) ;
Contenido en: Planeación para la conservación de la biodiversidad terrestre en México: retos en un país megadiverso México : Comisión Nacional para el Conocimiento y Uso de la Biodiversidad : Secretaría de Medio Ambiente y Recursos Naturales, Comisión Nacional de Áreas Naturales Protegidas, 2011 p. 89-107 ISBN:978-607-7607-58-8
Nota: Solicítelo con su bibliotecario/a
Resumen en español

Históricamente muchos de los sistemas de áreas protegidas han sido seleccionados en forma poco sistemática, lo que resulta en conjuntos de reservas ineficientes. Sin embargo, el desarrollo de las computadoras y el uso de algoritmos matemáticos hicieron posible la definición de métodos cuantitativos para priorizar áreas para la conservación. En el presente capítulo comparamos los resultados de tres diferentes algoritmos utilizados para seleccionar redes de conservación: CPLEX, ResNet y Marxan, cuantificando las similitudes en la selección de áreas frente a diferentes metas de conservación para diversos grupos de especies (seleccionadas por expertos, raras, comunes o todas). Para realizar los análisis utilizamos dos grupos taxonómicos diferentes: anfibios (302 especies) y reptiles (710 especies). Los resultados mostraron que no existe una única solución adecuada para cumplir los objetivos de conservación. Sin embargo, hubo sitios que siempre fueron escogidos, independientemente del algoritmo utilizado. Estos sitios son irremplazables. Lo anterior indica que estas áreas son tan particulares biológicamente que deben ser altamente prioritarios para conservación, por lo cual los llamamos sitios altamente prioritarios (SAP). Con el avance tecnológico y mayor conocimiento ecológico será posible, en un futuro cercano, que un mismo algoritmo pueda refinar, por medio de análisis multicriterio, la red de áreas para la conservación en un escenario más real, que asegure la persistencia de la biodiversidad en ambientes donde aún existen hábitats naturales con base en criterios de configuración espacial (área, forma, alineamiento, multiplicabilidad, dispersión y conectividad) y de parámetros ecológicos que indiquen la “calidad biológica” del hábitat y de las poblaciones que habitan en él (i.e. estructura poblacional, interacciones bióticas, tasas de crecimiento y dispersión, etc.);

también será posible evaluar la factibilidad de la implementación en función del estado de tenencia de la tierra y el costo social (oportunidades para la gente vs. el desplazamiento de poblaciones rurales) y económico (compra, manejo y transacción de la tierra). En este contexto vale la pena resaltar la importancia de tomar en cuenta los esfuerzos sociales en conservación, por lo cual la generación de bases espaciales de esos esfuerzos es imprescindible. Por el momento, entre las limitantes existentes está el acceso a datos sociales y económicos estandarizados a lo largo del área de planeación y la falta de datos ecológicos de la mayoría de las especies.

Resumen en inglés

Many protected areas systems have historically been selected in a non-systematic manner, resulting in ineicient groups of reserves. However, the development of computer technology and the use of mathematical algorithms have enabled the development of quantitative methods to prioritize areas for conservation. In this chapter, we compared the results of three diferent algorithms used in the selection of conservation networks: CPLEX, ResNet and Marxan, quantifying the similarities in the selection of areas in the face of different conservation targets for diferent groups of species (selected by experts, rare, common and for the total number of species). To carry out this analysis we used two taxonomically diferent groups: amphibians (302 species) and reptiles (710 species). he results showed that no single suitable solution exists to meet the various conservation objectives. However, some sites were always chosen, regardless of the algorithm used, and such sites are irreplaceable. his indicates that these areas are so biologically unique that they are of high priority for conservation; we have called them Sites of High Priority (SHP). With technological advancement

and greater ecological knowledge it will soon be possible, through multicriteria analysis, for the same algorithm to reine the network of conservation areas in a more realistic scenario in order to ensure the persistence of biodiversity in environments where natural habitats still exist, based on spatial coniguration criteria (area, shape, alignment, replication, distribution, and connectivity) and on ecological parameters that indicate the “biological quality” of each habitat and of the populations within (i.e. population structure, biotic interactions, dispersal and growth rates, etc.) and in turn evaluate the feasibility of statewide implementation of land tenure, and social (opportunities for the people vs. the displacement of rural populations) and economic costs (purchasing, management, and transaction of the land). In this context, it is also worth highlighting the importance of taking social eforts into account in conservation and, therefore, the generation of a spatial basis for these eforts is essential. For the moment, existing constraints include access to social and economic data that is standardized over the entire planning area, and the lack of ecological data for most species.


7.
Artículo
*En hemeroteca, SIBE-San Cristóbal
Ecological-niche modeling and prioritization of conservation-area networks for mexican herpetofauna
Urbina Cardona, Nicolás ; Flores Villela, Oscar Alberto (coaut.) ;
Contenido en: Consertvation Biology Vol. 24, no. 4 (August 2010), p. 1031-1041 ISSN: 0888-8892
Bibliotecas: San Cristóbal
Cerrar
SIBE San Cristóbal
49467-10 (Disponible)
Disponibles para prestamo: 1
Nota: En hemeroteca, SIBE-San Cristóbal
PDF
Resumen en: Español | Inglés |
Resumen en español

La información sobre la distribución geográfica de las especies y de las variables que determinan esos patrones es una de las herramientas más importantes de la biología de la conservación. Utilizamos el modelado de la máxima entropía del nicho para correr modelos de la distribución de 222 especies de anfibios y 371 de reptiles (49% endémicas y 27% amenazadas) de las que contamos con 34,619 registros geográficos individuales. La región de planificación está en el sureste de México, comprende 20% de la superficie del país, incluye 80% de la herpetofauna del país, y carece de un sistema de áreas protegidas adecuado. Utilizamos datos probabilísticos para construir modelos de distribución de la herpetofauna para utilizarlos en la priorización de áreas de conservación para tres grupos focales (todas las especies, especies endémicas y especies amenazadas). La precisión de los modelos de distribución de especies fue mejor para especies endémicas y amenazadas que para todas las especies.

Cuarenta y siete porciento de la región ha sido deforestada y se requieren áreas de conservación adicionales con 13.7% a 88.6% de más vegetación nativa (76% a 96% de las áreas están afuera del actual sistema de áreas protegidas). Hubo traslape en 26 de las principales áreas seleccionadas en la red de áreas de conservación priorizada para preservar a los grupos focales, y para los tres grupos focales la proporción de tipos de vegetación requeridos para su conservación fue constante: 30% bosques de pino-encino, 22% bosque tropical perennifolio, 17% bosque bajo deciduo y 8% bosques montanos de niebla. El hecho de que grupos diferentes de especies requieren la misma proporción de tipos de hábitat sugiere que los bosques de pino y encino soportan la mayor proporción de especies endémicas y amenazadas y, por lo tanto, deben ser priorizados por encima de otros tipos de vegetación para su inclusión en las áreas protegidas del sureste de México.

Resumen en inglés

One of the most important tools in conservation biology is information on the geographic distribution of species and the variables determining those patterns. We used maximum-entropy niche modeling to run distribution models for 222 amphibian and 371 reptile species (49% endemics and 27% threatened) for which we had 34,619 single geographic records. The planning region is in southeastern Mexico, is 20% of the country's area, includes 80% of the country's herpetofauna, and lacks an adequate protected-area system. We used probabilistic data to build distribution models of herpetofauna for use in prioritizing conservation areas for three target groups (all species and threatened and endemic species). The accuracy of species-distribution models was better for endemic and threatened species than it was for all species. Forty-seven percent of the region has been deforested and additional conservation areas with 13.7% to 88.6% more native vegetation (76% to 96% of the areas are outside the current protected-area system) are needed. There was overlap in 26 of the main selected areas in the conservation-area network prioritized to preserve the target groups, and for all three target groups the proportion of vegetation types needed for their conservation was constant: 30% pine and oak forests, 22% tropical evergreen forest, 17% low deciduous forest, and 8% montane cloud forests. The fact that different groups of species require the same proportion of habitat types suggests that the pine and oak forests support the highest proportion of endemic and threatened species and should therefore be given priority over other types of vegetation for inclusion in the protected areas of southeastern Mexico.


8.
- Artículo con arbitraje
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Resumen en: Inglés |
Resumen en inglés

Traditionally, biodiversity conservation gap analyses have been focused on governmental protected areas (PAs). However, an increasing number of social initiatives in conservation (SICs) are promoting a new perspective for analysis. SICs include all of the efforts that society implements to conserve biodiversity, such as land protection, from private reserves to community zoning plans some of which have generated community-protected areas. This is the first attempt to analyze the status of conservation in Latin America when some of these social initiatives are included. The analyses were focused on amphibians because they are one of the most threatened groups worldwide. Mexico is not an exception, where more than 60% of its amphibians are endemic. We used a niche model approach to map the potential and real geographical distribution (extracting the transformed areas) of the endemic amphibians. Based on remnant distribution, all the species have suffered some degree of loss, but 36 species have lost more than 50% of their potential distribution

For 50 micro-endemic species we could not model their potential distribution range due to the small number of records per species, therefore the analyses were performed using these records directly. We then evaluated the efficiency of the existing set of governmental protected areas and established the contribution of social initiatives (private and community) for land protection for amphibian conservation. We found that most of the species have some proportion of their potential ecological niche distribution protected, but 20% are not protected at all within governmental PAs. 73% of endemic and 26% of microendemic amphibians are represented within SICs. However, 30 micro-endemic species are not represented within either governmental PAs or SICs. This study shows how the role of land conservation through social initiatives is therefore becoming a crucial element for an important number of species not protected by governmental PAs


9.
Artículo
*Solicítelo con su bibliotecario/a
Reproductive activity of three sympatric viviparous lizards at Omiltemi, Guerrero, Sierra Madre del Sur, Mexico
Ramírez Pinilla, Martha Patricia ; Calderón Espinosa, Martha L. (coaut.) ; Flores Villela, Oscar Alberto (coaut.) ; Muñoz Alonso, Luis Antonio (coaut.) ; Méndez, Fausto R. (coaut.) ;
Contenido en: Journal of Herpetology Vol. 43, no. 3 (2009), p. 409-420 ISSN: 0022-1511
Nota: Solicítelo con su bibliotecario/a
Resumen en: Inglés |
Resumen en inglés

We studied the reproductive characteristics of sympatric populations of Sceloporus formosus scitulus, Sceloporus omiltemanus (Phrynosomatidae), and Mesaspis gadovii (Anguidae) at the Omiltemi forest reserve (Guerrero, Mexico). Males are larger and reach larger body sizes at reproductive maturity and are more colorful than females in both Sceloporus, whereas males are smaller than females and reach sexual maturity at similar body sizes in M. gadovii. These species are single brooded and follow a common pattern of annual reproductive activity. The reproductive activity of females and males of the three species is seasonal; vitellogenesis is initiated in late summer and continues in autumn/rainy season, gestation occurs throughout the winter/dry season, and parturition occurs in early spring. All three species have intersexual synchrony in reproductive activity. In spite of similar reproductive schedules, some subtle features related to the length of each of the reproductive stages could be observed

Sceloporus formosus scitulus has a more extended reproductive season, and large females start vitellogenesis earlier than do small ones. Males have a prolonged reproductive activity and a short nonreproductive season. In contrast, the reproductive cycle of the other two species is defined by shorter reproductive season and less intrasexual asynchrony for both sexes than found in S. f. scitulus. The seasonal pattern of reproduction shared by these three species is characteristic of other viviparous lizards at high elevations in tropical and subtropical latitudes of Central and South America, being convergent for different lizard families. This convergence in reproductive patterns suggests a common evolutionary response to environmental factors associated with montane habitats, whereas specific differences observed within species are attributed to the particular evolutionary history of each taxon.


10.
Tesis - Maestría
Anfibios y reptiles como potenciales indicadores del estado de conservación del hábitat, en tres sitios del Corredor Biológico Mesoamericano (CBM) en México / Romel René Calderón Mandujano
Calderón Mandujano, Romel René ; Pozo, Carmen (Asesor) ; Flores Villela, Oscar Alberto (Asesor) ; González Solís, David (Tutor) ;
Chetumal, Quintana Roo, México : El Colegio de la Frontera Sur , 2006
Clasificación: TE/597.909726 / C3
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ECO040002897 (Disponible)
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ECO030006462 (Disponible)
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ECO010009627 (Disponible)
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Resumen en español

Mediante tres investigaciones en los que se hicieron muestreos sistemáticos en las Reservas de la Biosfera Calakmul y Sian Ka’an, y en dos ejidos del centro de Quintana Roo se destaca la importancia de algunas especies de anfibios y reptiles como potenciales indicadores biológicos del estado de conservación de un área. Los muestreos se llevaron a cabo en sitios conservados y perturbados dentro de áreas de selva baja y mediana. Se realizaron búsquedas dirigidas en transectos apoyadas con trampas de cerco de desvío. Los resultados muestran la presencia de 14 especies cuyas abundancias varían en función de la perturbación que presenta el hábitat. Tres de estas especies (Anolis rodriguezii, Trachycaphalus venulosus y Smilisca baudini) mantienen sus variaciones constantes en los diferentes sitios geográficos y se pueden considerar como indicadoras de un estado de la vegetación ya sea conservado o perturbado.

Índice

Resumen
Introducción
Objetivo general
Objetivos particulares
Materiales y Métodos
Área de estudio
Vegetación
Análisis de la información
Resultados
Discusión
Conclusiones
Literatura citada
Cuadros y Figuras
Anexo 1
Anexo 2