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1 May 2009 Phenology and Distribution of Caddisflies (Trichoptera) in Oak Creek, A High-desert Perennial Stream in Arizona
Dean W. Blinn, David E. Ruiter
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We collected 58 species of caddisflies representing 30 genera and 16 families during a 5-year period in Oak Creek, Coconino Co., Arizona. This is the largest number of species of caddisflies reported in any drainage in Arizona and includes >50% of species reported from the state. Species assemblages changed dramatically along the 767-m descent of Oak Creek over a 70-km distance. Discharge records suggest reduced winter and spring surges of water and increased embeddedness of the channel have caused changes in assemblages of caddisflies in Oak Creek over the past several decades. Increased numbers of hydroptilids, hydropsychids, and leptocerids have replaced limnephilids. We conducted a 2-year phenological study at monthly intervals at two sites separated by <400 m in elevation and a distance of 14 km. Spring surges of water played a selective role in larval success and ultimately in number and composition of captures of adults between years. We increased the number of recorded species of caddisflies to 109 in the state. A baseline on assemblages of caddisflies was provided for monitoring changes in health of ecosystem in Oak Creek during the predicted, long-term drought in the Southwest.

Dean W. Blinn and David E. Ruiter "Phenology and Distribution of Caddisflies (Trichoptera) in Oak Creek, A High-desert Perennial Stream in Arizona," The Southwestern Naturalist 54(2), 182-194, (1 May 2009).
Received: 7 January 2008; Accepted: 1 September 2008; Published: 1 May 2009
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