On the role of small mammals in mediating climatically driven vegetation change |
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| Authors: | CG Curtin DA Kelt TC Frey & JH Brown |
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| Institution: | Arid Lands Project, Box 29, Animas NM. 87501.E-mail:;, Department of Wildlife, Fish, and Conservation Biology, University of California, Davis, CA 95616, U.S.A.E-mail:;, Department of Biology, Eastern NM University, Portales, NM 88130.E-mail:;, Department of Biology, University of New Mexico, Albuquerque, NM 87131.E-mail: |
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| Abstract: | Biotic and abiotic processes jointly influence natural systems, yet opportunities to integrate studies of both processes are uncommon. For two decades we have excluded different subsets of the small mammal community from a series of plots near a grassland-desert ecotone in the northern Chihuahuan Desert. These studies spanned a period of historically high winter rainfall, allowing us to distinguish the effects of climate and small mammals on the composition and patch structure of vegetation. Removal of only kangaroo rats ( Dipodomys ) or of all small mammals led to increased cover of large herbaceous vegetation. The size of vegetative patches increased in all plots but this increase was three times greater where all rodents were removed. Thus, the activity of small mammals that forage under and near shrub canopies appear to significantly inhibit the expansion of existing vegetative patches, and may have a stronger influence on habitat structure than previously recognized. |
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| Keywords: | Abiotic factors biotic factors Chihuahuan Desert climate change small mammals |
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