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Arthropod diversity of exotic vs. native Robinia species in northern Arizona

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1 Arthropods were collected on native locust, Robinia neomexicana A. Gray, and exotic Robinia pseudoacacia L. in northern Arizona over a 2-year period to determine the number of arthropod species and number of individuals present.

2 More arthropod species were found on the native (251) than on the exotic Robinia (174).

3 Greater species diversity was likewise found on the native than the exotic. The five most numerous insects collected each year accounted for 81% to 91% of the total number collected on the exotic and native Robinia in 1997 and 1998. Only 12 species occurred on both the native and exotic Robinia in both years.

4 These findings are discussed in the context of using exotic trees in plantations and ecological theory regarding rates of arthropod species accumulation on exotic hosts.

Keywords: Exotic plant; Robinia neomexicana; Robinia pseudoacacia; insect assemblages; native plant; species diversity

Document Type: Research Article


Affiliations: 1: College of Agriculture, Cooperative Extension, University of Arizona, U.S.A., and 2: School of Forestry, Northern Arizona University, Box 15018, Flagstaff, Arizona 86011, U.S.A.

Publication date: February 1, 2001


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