Abundancia y estructura poblacional de Oxymycterus paramensis (Rodentia) en fragmentos de bosque en los Andes de Bolivia
Abstract
La fragmentación del hábitat es una de las principales amenazas para la conservación de especies a nivel global. Determinar cómo responden las especies a la fragmentación es importante para definir estrategias de manejo y conservación. Es por eso que el objetivo de este estudio es determinar la ecología poblacional de Oxymycterus paramensis en fragmentos de bosque de Polylepis besseri en los andes de Bolivia. Durante los meses de marzo a mayo de 2000 se evaluó la abundancia y estructura poblacional de O. paramensis en dos fragmentos de bosque de P. besseri en la localidad de Sacha Loma, provincia Mizque, Cochabamba. Se utilizó el método de captura, marcaje y recaptura y se evaluaron parámetros poblacionales como la abundancia de individuos, densidad, la sobrevivencia, la estructura de sexos y edades, la reproducción, el peso y biomasa, las cuales fueron comparadas entre las subpoblaciones de ambos fragmentos. No se encontraron diferencias en la densidad, en el peso promedio, en la proporción de sexos, y tampoco en la proporción de edades, pero si se detectaron diferencias significativas en la tasa de sobrevivencia entre ambos fragmentos. La evidencia sugiere que O. paramensis no es afectada por estos niveles de fragmentación.
Habitat fragmentation is one of the main threats to the conservation of species globally. Determining how species respond to fragmentation is important to define management and conservation strategies. Thus, the objective of this study is to determine the population ecology of Oxymycterus paramensis in forest fragments of Polylepis besseri in the Andes of Bolivia. During the months of March to May 2000, the abundance and population structure of O. paramensis was evaluated in two fragments ofP. besseri forest in the town of Sacha Loma, Mizque province, Cochabamba. The method of capture-mark-recapture was used for population parameters evaluation such as the abundance of individuals, density, survival, sex and age structure, reproduction, weight and biomass, which were compared between the subpopulations of both fragments. No differences were found in the density, in the average weight, in the proportion of sexes, nor in the proportion of ages, but there were significant differences in the survival rate between both fragments. Evidence suggests that O. paramensis is not affected by these levels of fragmentation.
Habitat fragmentation is one of the main threats to the conservation of species globally. Determining how species respond to fragmentation is important to define management and conservation strategies. Thus, the objective of this study is to determine the population ecology of Oxymycterus paramensis in forest fragments of Polylepis besseri in the Andes of Bolivia. During the months of March to May 2000, the abundance and population structure of O. paramensis was evaluated in two fragments ofP. besseri forest in the town of Sacha Loma, Mizque province, Cochabamba. The method of capture-mark-recapture was used for population parameters evaluation such as the abundance of individuals, density, survival, sex and age structure, reproduction, weight and biomass, which were compared between the subpopulations of both fragments. No differences were found in the density, in the average weight, in the proportion of sexes, nor in the proportion of ages, but there were significant differences in the survival rate between both fragments. Evidence suggests that O. paramensis is not affected by these levels of fragmentation.
Description
Vol. 17, No. 19