Abstract
Summary Small mammal ( Marmosa mexicana , Heteromys desmarestianus and Ototylomys phyllotis accounted for 68% of mammals ( Didelphis marsupialis dominated captures of mammals >200 g. Trap success increased with litter fall across grids. Trap success and density tended to be higher at the onset of the dry season. More females were breeding and more animals were in poor body condition at the onset of the wet season. Across studies using grid trapping in the neotropics, diversity and density were positively related to trapping effort. Despite this effect, small mammal densities at Las Cuevas were 2.7 per ha for mammals Didelphis densities had a negative effect on densities of all other small mammals across studies; however, this relationship was driven largely by our study. A combination of poor soil, high Didelphis densities, and high predator densities is hypothesized for such low densities of small (
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