Response of grasshoppers (Orthoptera: Acrididae) to livestock grazing in southeastern Arizona: differences between seasons and subfamilies |
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Authors: | Karen Jepson-Innes Carl E Bock |
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Institution: | (1) Department of Environmental, Population, and Organismic Biology, University of Colorado, Box 334, 80309 Boulder, CO, USA;(2) Present address: Department of Biochemistry, University of California, 94720 Berkeley, CA, USA |
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Abstract: | Summary Grasshopper densities were compared between grazed and ungrazed semidesert grassland sites in southeastern Arizona. Bouteloua-dominated perennial grass cover was about 1.5 times greater on the livestock exclosure. Grasshoppers were 3.7 times more abundant on the protected area in the summers of 1983 and 1984, when dominant species were grass-feeding members of the subfamily Gomphocerinae. In fall 1984, grasshoppers were 3.8 times more common on the grazed site, when dominants were mainly herb-feeders in the subfamily Melanoplinae. These results indicate important seasonal and taxonomic differences in the responses of grasshoppers to the activities of vertebrate grazers. |
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Keywords: | Acrididae Arizona grasshoppers grazing |
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