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Brussard, R F. 1985. Geographical patterns and environmental gradients: the 
     central-marginal model in Drosophila revisited. Ann. Rev. Ecol. Syst. 15 
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Bunce, R. G. H., and M. W. Shaw. 1973. A standardized procedure for 
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Ferris, C. D., and F. M. Brown. 1980. Butterflies of the Rocky Mountain 
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Gauch, H. G. 1982. Multivariate Analysis in Community Ecology. New York: 
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Whittaker, R. H. 1952. A study of summer foliage insect communities in the 
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