Variación estacional en la diversidad y composición de ensambles de murciélagos filostómidos en bosques continuos y fragmentados en Los Chimalapas, Oaxaca, México

Abstract

The fragmentation of tropical forest may modify the abundance and species richness of bats, but its effects on the temporal composition of assemblages have been less understood. We evaluate the species richness, diversity, proportion of trophic guilds, and composition of nose-leaf bat assemblages in continuous (BC) and fragmented (BF) forest, during 2 dry and 2 rainy seasons in a forest of Los Chimalapas, Oaxaca, Mexico. In this study we conducted from March 2010 to February 2012, and bats were captured with mist nets during 144 nights. We captured 1 840 individuals of 29 species of nose-leaf bats. The results show that BC has a temporal pattern of richness, dominance, diversity, and proportion of trophic guild according to variations in food availability in each season. The BF show little temporal variability in the above features, but high variability in the composition of assemblages compared to BC, that show more stability. Habitat fragmentation may intensify the severity of seasonal changes in the availability of resources, which in turn may cause a greater temporal variability in the composition of assemblages.