Abstract
The abundance, species diversity, and spatial distribution of small mammals were studied in two localities in southern Vietnam: the Cat Tien National Park and the Binh Chau Nature Reserve. Rodents were trapped on the ground and in the tropical forest canopy (2-12 m above the ground), marked, and released on the spot. Species diversity of small mammals in undisturbed tropical forest (9 species) was higher than in disturbed tropical forest (14 species). The rat Maxomys surifer and the squirrel Callosciurus flavimanus were dominant. In undisturbed forest, the frequencies of rodent occurrence on the ground and in the canopy were of the same order; in disturbed forest, rodents occurred in the canopy an order of magnitude less frequently than on the ground.
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