Abstract
Bird communities were studied on 3 sites in southern Nevada for a period of 15 months, including 2 breeding seasons. Study sites ranged from 975 m to about 1220 m elevation. Vegetation varied from low desert shrub dominated by creosote (Larrea tridentata) and Mohave yucca (Yucca schidigera) to sparse pinyon pine (Pinus monophylla) - California juniper (Juniperus californica) woodland. Twenty-three species bred on 1 or more study sites during 1975 and 1976. Species richness and density of individuals was directly related to elevation in all seasons. Monthly fluctuations in species richness followed a similar pattern on all 3 sites; fluctuations in density were more variable among sites. Spring migration was characterized by more species and individuals than was fall migration; few or no migrants were recorded from the 2 lowest sites in fall. Density and number of species was lowest in winter, particularly January. Seasonal fluctuations in abundance of individuals within major trophic groups differed among groups, probably in response to food availability.
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