Abstract

VAN DEN BERGH, M.B.  and  KAPPELLE, M.. Diversity and distribution of small terrestrial rodents along a disturbance gradient in montane Costa Rica. Rev. biol. trop [online]. 1998, vol.46, n.2, pp.331-338. ISSN 0034-7744.

A total of 389 rodent captures in five unequally disturbed habitats in a Costa Rican montane cloud forest corresponded to 185 individuals (seven species, two families). Species richness was similar for all habitats, averaging 4-5 species/habitat. Population density and capture frequency were higher in moderately disturbed habitats; Peromyscus mexicanus and Scotinomys xerampelinus were four to five times more common than other murids. These species represented 79.4 % of all captures and 73.5 % of all captured individuals. Heteromyid species were rarely trapped. The importance of disturbance-mediated within-habitat microenvironmental heterogeneity for terrestrial small-sized rodent populations is stressed.

Keywords : Costa Rica; disturbance; montane cloud forest; rodents.