Report on a mammal survey of the Cosanga River drainage, Ecuador

Resumen

A mammal survey was conducted of the Cosanga Valley, Napo Province, Ecuador.The Cosanga Valley is located on the eastern slope of the Andes.The ecosystem of the survey area is Evergreen Mountain Forest (Sierra 1999).Sherman traps, pitfall traps, and mist nets were used to collect the specimens.Twenty-two species of mammals were found from the survey area; of these, twenty were collected and two more were observed, representing an approxima¬ tion of the small mammalian assemblage of this area.Among the specimens collected were seven species {Cryptotis equator is, Stumira bogotensis, S. magna, Platyrrhims nigellus, Eptesicus brasiliensis, Thomasomys erro, and Neusticomys monticolus) that represent significant range records for their species.Moreover, three species (Carollia perspicillata, T. erro, and iV.monticolus) represent new elevation records for their species in eastern Ecuador.Shannon-Weaver diversity analyses were performed for the overall mammalian diversity and bat diver¬ sity.Bat diversity was compared to other mountain forest locations.