Population dinamics of the big-earedclimbing rat (Ototylomys phyllotis) was studied in a subdeciduous tropicalrainforest located at Rancho Hobonil, Tzucacab, Yucatan using a mark-recapturetechnique, from April 1996 to April 1998 during five nights per 24 months. Theminimumnumberknownalive technique (MNKA) was used to estimatepopulation size. We captured 123 rats, 52% were females and 48% males. The sexratio was 1:1 during this study. Density ranged from 10 to 46 ind./ha. And wasnot significantly correlated with precipitation (p>0.05). Presence of reproductiveindividuals from both sexes during the majorities of the studied months andthe reproductive activity from females suggest a continuous poliestric patternfor this species.
