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University of Arizona (1971)

Population studies of nocturnal rodents in two desert habitats

Massion, Dennis Daniel

Titre : Population studies of nocturnal rodents in two desert habitats

Auteur : Massion, Dennis Daniel

Université de soutenance : University of Arizona

Grade : Master of Science (MS) 1971

Résumé
During August, September and October 1970, two live trap grids consisting of 196 stations each were utilized to monitor the home ranges of nocturnal rodents in dif ferent habitats in the lower part of the Silverbell bajada, Pima County, Arizona. Although the two sites were within one and a half miles of each other, there were differences in home ranges and population densities. Dipodomys merriami were more numerous in the finer-textured soils of the lower desert dominated by creosotebush and white bur sage while Perognathus amplus was found to be more closely associated with the coarser-textured soils of the lower ecotone com posed of foothill paloverde and creosotebush. Size of home ranges was inversely proportional with plant cover for Perognathus amplus. In the ecotone area Perognathus baileyi was found almost exclusively on the rocky slopes of the wash. An average density of 5.35 and 1,38 individuals per hectare was found for Perognathus amplus and Dipodomys merriami respectively on the ecotone site and an average density of 2.59 and 2,07 individuals per hectare was found for Perognathus amplus and Dipodomys merriami respectively in the lower creosotebush community. The disappearance into hibernation of Perognathus ampins from the active biomass released a major portion of the restricted food supply for use by a number of other species.

Mots clés : Pocket mice. ; Ground squirrels. ; Deserts — Southwest, New. ; Desert animals. ; Desert plants. ; Rodents — Arizona.

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