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Stevens, L. E., J. E. Sublette, andJ. P. Shannon 1998. Chironomidae (Diptera) of the Colorado <br />River, Grand Canyon, Arizona, USA, II: Factors influencing distribution. Great Basin <br />Naturalist 52(2): 147-155. <br />Stewart, A. J. and J. M. Loar. 1994. Spatial and temporal variation in biomonitoring data. pp. <br />91-124, In: S. L. Loeb and A. Spacie (eds.), Biological Monitoring of Aquatic Systems. <br />Lewis Publishers, Boca Raton, FL. <br />Sublette, J. E., L. E. Stevens, and J. P. Shannon. 1998. Chironomidae (Diptera) of the Colorado <br />River, Grand Canyon, Arizona, USA, I: systematics and ecology. Great Basin Naturalist <br />52(2): 97-146. . <br />ter Braak, C. J. F. 1986. Canonical correspondence analysis: A new eigenvector technique for <br />multivariate direct gradient analysis. Ecology 67:1167-1179. <br />ter Braak, C. J. F. 1987. Unimodal models to relate species to environment. Agricultural <br />Mathematics Group, AC Wageningen, The Netherlands. <br />Wiggins, G. B. 1996. Larvae of the North American caddisfly genera (Trichoptera), 2°d ed. <br />Univ. Toronto Press, Toronto, Ontario. 457-p. <br />ACKNOWLEDGMENTS <br />We thank Steven A. Sanders, Chris Gonzales, Danny Zamora, Eddie Bennett, Darrell James, <br />Mark Doles, Chris Milensky, Monique Teich, Rick Castell, Carlos Garcia, Susan Garza, Jessica <br />Lucero, Christie Lefebvre, Logan Foster, Robert F. Akroyd, Richard Hansen, Marc C. <br />Wethington for assistance with field collections. We gratefully acknowledge assistance from <br />Darrell Snyder (Larval Fish Lab, Colorado State University) with classifications of fish species <br />by reproductive guild. We are indebted to Stephen Henry for administrative support and to <br />Glenn Smith for computing and communications support and expertise.