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versión On-line ISSN 0717-6538
MUNOZ-PEDREROS, Andrés; FLETCHER, Susan; YANEZ, José y SANCHEZ, Pamela. Diversity of small mammals in three environments of the National Reserve Lago Peñuelas, Región de Valparaíso, Chile. Gayana (Concepc.) [online]. 2010, vol.74, n.1, pp.1-11. ISSN 0717-6538. http://dx.doi.org/10.4067/S0717-65382010000100003.
Chilean Mediterranean ecosystems, the only of this type present in South América of the four present in the world, are considered priority áreas for conservation due to their high concentration of endemic species that have experienced accelerated rates of habitat destruction. They contain more than 39% of the mammal species, 47% of its endemic species, and 65% of the threatened species of Chile. Yet, these ecosystems are poorly represented in the system of protected áreas, one of which is the Reserva Nacional Lago Peñuelas (RNLP) that is part of the Biosphere Reserve La Campana-Peñuelas, but whose mammal fauna is poorly documented. We studied both α and β diversity of the mammal assemblage in all three environments present at the RNLP (sclerophyllous forest, mixed shrub, and savanna oí Acacia caven). Sherman traps grids were installed, pellets of two raptors (Tyto alba and Bubo magellanicus) were analyzed, tracks and signs were recorded, and direct observations were performed in the four seasons of the year 2001. We determined species richness (S), relative abundance, a diversity - considering its richness and structure (Shannon-Wiener and Pielou indexes)-, β diversity (Bray-Curtis index), and compared the diversity found with that documented for the same latitude from east to west. We recorded a total of 16 species: Thylamys elegans, Oligoryzomys longicaudatus, Abrothrix longipilis, A. olivaceus, Chelemys megalonyx, Phyllotis darwini, Myocastor coypus, Octodon degus, O. lunatus, Spalacopus cyanus, Abrocoma bennetti, Rattus norvegicus, R. rattus, Mus musculus, Lepus capensis, and Oryctolagus cuniculus. The coastal sclerophyllous forest was the most diverse with a species homogeneous distribution, followed by the mixed shrub, and fnally the A. caven savanna. Also, the sclerophyllous forest is similar to the mixed scrub; in turn, both are very dissimilar to the savanna of A. caven. The diversity recorded in the study área is consistent with that of other áreas of the Mediterranean áreas. We discuss the status of these ecosystems and the diversity is compared to six documented locations at the same latitude.
Palabras clave : Biodiversity; mammals; rodents; Central Chile.