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Una mirada al conocimiento de los ecosistemas de México / editores: Patricia Balvanera, Ernesto Arias-González, Ricardo Rodríguez-Estrella, Lucía Almeida-Leñero y Juan J. Schmitter-Soto | |
Balvanera, Patricia (ed.) ; Arias González, Jesús Ernesto (coed.) ; Rodríguez Estrella, Ricardo (coed.) ; Almeida Leñero, Lucía (coed.) ; Schmitter Soto, Juan Jacobo (coed.) ; | |
Ciudad de México, México : Universidad Nacional Autónoma de México , 2016 | |
Introducción general
1 Cambio climático: contexto histórico, paleoecológico y paleoclimático. Tendencias actuales y perspectivas
2 Impacto de las actividades humanas en la biodiversidad y en los ecosistemas
3 Cambios en la biodiversidad y sus consecuencias en el funcionamiento de los ecosistemas y sus servicios
4 Los servicios ecosistémicos
5 Herramientas y estrategias para el estudio y la conservación de los ecosistemas y su biodiversidad
Conclusiones generales
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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.
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The impact of conservation on the status of the world's vertebrates | |
Hoffmann, Michael ; Hilton Taylor, Craig (coaut.) ; Angulo, Ariadne (coaut.) ; Muñoz Alonso, Luis Antonio (coaut.) ; Santos Barrera, Georgina (coaut.) ; | |
Contenido en: Science Vol. 330, no. 6010 (December 2010), p. 1503-1509 ISSN: 0036-8075 | |
Using data for 25,780 species categorized on the International Union for Conservation of Nature Red List, we present an assessment of the status of the world’s vertebrates. One-fifth of species are classified as Threatened, and we show that this figure is increasing: On average, 52 species of mammals, birds, and amphibians move one category closer to extinction each year. However, this overall pattern conceals the impact of conservation successes, and we show that the rate of deterioration would have been at least one-fifth again as much in the absence of these. Nonetheless, current conservation efforts remain insufficient to offset the main drivers of biodiversity loss in these groups: agricultural expansion, logging, overexploitation, and invasive alien species.
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*En hemeroteca, SIBE-Villahermosa | |
Una visión del estado de los anfibios críticamente amenazados del norte de Centroamérica y los sitios en los que habitan | |
García Moreno, Jaime ; Moore, Robin (coatu.) ; Santos Barrera, Georgina (coaut.) ; Urbina Cardona, Nicolás (coaut.) ; Muñoz, Antonio (coaut.) ; Walker, Paul (coaut.) ; Walker, Zoe (coaut.) ; Vásquez Almazán, Carlos (coaut.) ; Townsend, Josiah (coaut.) ; Jiménez, Ruth (coaut.) ; Upgren, Amy (coaut.) ; Barborak, Jim (coaut.) ; Bonilla Barbosa, Jaime Raúl (coaut.) ; | |
Contenido en: Mesoamericana Vol. 12, no. 1 (junio, 2008), p. 37-40 ISSN: 1659-2794 | |
Bibliotecas:
Villahermosa
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Nota: | En hemeroteca, SIBE-Villahermosa |
De acuerdo con la lista roja de la UICN, una tercera parte de las especies de anfibios del planeta están amenazadas. La principal amenaza es la pérdida de hábitat, y a esta se le ha sumado recientemente la epidemia del hongo quítrido que ha afectado fuertemente a las poblaciones de algunas especies en Mesoamérica. En este simposio se presentaron varios proyectos relacionados con anfibios cuyas últimas poblaciones están restringidas a una sola localidad (sitios AZE Alliance for Zero Extinction). Se discutió la necesidad de establecer una estrategia regional común para atacar los problemas relacionados con la conservación de este grupo en la región, así como el establecimiento de programas de monitoreo a largo plazo para evaluar tanto las tendencias poblacionales como la efectividad de las acciones emprendidas
According to IUCN´s red list, about a third of the planet's amphibian species are under threat. The main threat is habitat loss, and this is now reinforced by the chytrid fungus epidemic that has strongly affected the populations of some species in Mesoamerica. In this symposium several projects were presented, all of which are dealing with amphibian species whose last populations are restricted to single localities (AZE sites Alliance for Zero Extinctions). We discussed the need to establish a common regional strategy to deal with the conservation problems related to this group in our region, and also the establishment of long-term monitoring programs to evaluate both the population trends and the effectiveness of any actions taken.