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• W2185655245 abstract "--Rodent communities in sand dune, river valley, and low-elevation mountain habitats in the northern Chihuahuan Desert were studied during spring 1983 as part of a longer study to determine biomass partitioning. Fecal pellet analysis for the spring season revealed that herbivory was most common and supported 85.1, 95.7, and 92.1% of the rodent biomass in the dune, valley, and mountain sites, respectively. Granivory was greatest on the dune site at 17.4%. Insectivory was less than 1% on each site. Cluster and factor analyses, including both plant and rodent community parameters, showed that each site was distinct, but that the valley and mountain sites were more closely related than either was to the dune site. The purpose of this study was to analyze the proportions of rodent biomass supported by herbivory, granivory, and insectivory in three Chihuahuan Desert communities. To my knowledge, a study emphasizing the biomass supported by different trophic levels has not been done, although in recent years much attention has been given to the coexistence of competing rodent species in relation,to resource allocation. Several researchers, including O'Connel (1979), Wondolleck (1978) , and Brown and Lieberman (1973) 3), attributed the ability to coexist to differences in habitat selection. Smartt (1978) suggested that the subdivision of resources is accomplished by differences in morphology, microhabitat selection, and foraging behavior of the various species. Price (1976) concluded that different species exploit different seed densities. Other studies have reached similar conclusions. In a study of the food requirements of four species of coexisting heteromyids in the Mojave Desert of Nevada, French et al. (1974) found no significant difference in the dietary composition between sexes, genera, or species. Apparently the rodents were either opportunistic or had similar preferences. Seeds and vegetable material were approximately equal contributors to the diet, and arthropods made up only a small portion, but the biomass supported by these foods was not calculated. French et al. (1976) studied rodent biomass in a desert grassland in southern New Mexico composed of heteromyid, sciurid, and cricetid rodents. 1 Present address: Department of Zoology, Biology Science Building, University of Georgia, Athens, GA 30602 2 The diet, in terms of herbage, seeds, and arthropods, of each species was determined by fecal pellet analysis. The pellets were air—dried, ground, and permanently mounted on labeled slides. Four fields on each slide were analyzed at a power of 40x with a 100—square grid used to count the proportions of the different food groups. Apparently the manner in which desert rodent communities divide the available resources varies with the location. Here I attempt to show the trophic distribution of the rodent biomass in three Chihuahuan Desert communities during the spring." @default.
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• W2185655245 date "1988-01-01" @default.
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• W2185655245 title "Contributed Papers of the SECOND SYMPOSIUM ON RESOURCES OF THE CHIHUAHUAN DESERT REGION United States and Mexico" @default.
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