Ecologic relationships of co-occurring populations of opossums (Didelphis virginiana) and raccoons (Procyon lotor) in Tennessee

Article Abstract:

Possible interspecific relationships between opossums (Didelphis virginiana) and raccoons (Procyon lotor) were studied at two sites in Tennessee. Density of raccoons usually ranges from about one per 5.0-43.0 hectares, and density of opossums from one per 1.1-25.9 hectares. Number of opossums and raccoons was not significantly correlated with any of the habitat variables measured. There is a low, positive association between opossums and raccoons. The amount of habitat use by opossums and raccoons is determined by a preference for habitat type rather than a spatial relationship between the two species.

Behavior, Raccoons, Tennessee, Opossums, Animal ecology

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Patch use by gerbils (Gerbillus allenbyi) in sandy and rocky habitats

Article Abstract:

The giving-up density of Allenby's gerbil (Gerbillus allenbyi) in food patches placed along the boundary of two habitats (rock and sand) and placed in two microhabitats (bush and open) were measured. Foraging opportunities were controlled, and there are giving-up densities in food patches as a measure of G. allenbyi's perceived costs of foraging. G. allenbyi has a lower giving-up density in the bush microhabitat. The microhabitat effect is independent of sand or rock habitat. It occupies the sand habitats and is scarce within the rock habitat. The rock habitat is associated with higher predation risk.

Environmental aspects, Niche (Ecology), Niches (Ecology), Negev Desert, Gerbils

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