Un reciente estudio de Cole y colaboradores alerta sobre la vulnerabilidad y el riesgo de extinción de ranas cutín (Pristimantis spp.), las cuales han sido poco estudiadas. El cambio climático, destrucción y modificación del hábitat y enfermedades estarían involucrados en su declive. El estudio, realizado en dos sitios de la Cordillera Andina de Ecuador, en periodos de 8 años (en Yanayacu, Cordillera Oriental) y 2 años (en Cashca Totoras, Cordillera Occidental) provee datos poblacionales valiosos.
Cole, E. M., Bustamante, M. R., Almeida-Reinoso, D. y Funk, W. C. 2014. Spatial and temporal variation in population dynamics of Andean frogs: Effects of forest disturbance and evidence for declines. Global Ecology and Conservation. DOI: 10.1016/j.gecco.2014.06.002.
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Abstract
Biodiversity loss is a global phenomenon that can result in the collapse of food webs and critical ecosystem services. Amphibian population decline over the last century is a notable case of species loss because amphibians survived the last four major extinction events in global history, their current rate of extinction is unprecedented, and their rate of extinction is greater than that for most other taxonomic groups. Despite the severity of this conservation problem and its relevance to the study of global biodiversity loss, major knowledge gaps remain for many of the most threatened species and regions in the world. Rigorous estimates of population parameters are lacking for many amphibian species in the Neotropics. The goal of our study was to determine how the demography of seven species of the genus Pristimantis varied over time and space in two cloud forests in the Ecuadorian Andes. We completed a long term capture–mark–recapture study to estimate abundance, survival, and population growth rates in two cloud forests in the Ecuadorian Andes; from 2002 to 2009 at Yanayacu in the Eastern Cordillera and from 2002 to 2003 at Cashca Totoras in the Western Cordillera. Our results showed seasonal and annual variation in population parameters by species and sex. Pristimantis bicantus experienced significant reductions in abundance over the course of our study. Abundance, apparent survival, and population growth rates were lower in disturbed than in primary or mature secondary forest. The results of our study raise concerns for the population status of understudied amphibian groups and provide insights into the population dynamics of Neotropical amphibians.
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| © Elicio E. Tapia (Centro Jambatu). Bosque Protector Cashca Totoras (Provincia de Bolívar, Ecuador) |
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| © Luis A. Coloma (Centro Jambatu). Pristimantis bicantus |
Cole, E. M., Bustamante, M. R., Almeida-Reinoso, D. y Funk, W. C. 2014. Spatial and temporal variation in population dynamics of Andean frogs: Effects of forest disturbance and evidence for declines. Global Ecology and Conservation. DOI: 10.1016/j.gecco.2014.06.002.
Ver publicación
Abstract
Biodiversity loss is a global phenomenon that can result in the collapse of food webs and critical ecosystem services. Amphibian population decline over the last century is a notable case of species loss because amphibians survived the last four major extinction events in global history, their current rate of extinction is unprecedented, and their rate of extinction is greater than that for most other taxonomic groups. Despite the severity of this conservation problem and its relevance to the study of global biodiversity loss, major knowledge gaps remain for many of the most threatened species and regions in the world. Rigorous estimates of population parameters are lacking for many amphibian species in the Neotropics. The goal of our study was to determine how the demography of seven species of the genus Pristimantis varied over time and space in two cloud forests in the Ecuadorian Andes. We completed a long term capture–mark–recapture study to estimate abundance, survival, and population growth rates in two cloud forests in the Ecuadorian Andes; from 2002 to 2009 at Yanayacu in the Eastern Cordillera and from 2002 to 2003 at Cashca Totoras in the Western Cordillera. Our results showed seasonal and annual variation in population parameters by species and sex. Pristimantis bicantus experienced significant reductions in abundance over the course of our study. Abundance, apparent survival, and population growth rates were lower in disturbed than in primary or mature secondary forest. The results of our study raise concerns for the population status of understudied amphibian groups and provide insights into the population dynamics of Neotropical amphibians.
