Abstract :
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 Cincuenta y ocho especies de Tricoptera de 30 generos y 16 familias fueron colectadas durante un periodo de 5 anos en Oak Creek, condado de Coconino, Arizona, EE.UU. Esta es la mas alta cantidad de especies de Tricoptera reportada en cualquier desague en Arizona e incluye 50% de las especies reportadas en el estado. Los ensamblajes de especies cambiaron dramaticamente a lo largo del descenso de 767 metros en la distancia de 70 kilometros de Oak Creek. Registros de descarga sugieren inundaciones invernales y primaverales reducidas y el aumento de la sedimentacion del lecho han cambiado los ensamblajes de Tricoptera en Oak Creek en las ultimas decadas Numeros mayores de individuos de hydroptilidae, hydropsychidae, y leptoceridae han reemplazado limnephilidae. Un estudio fenologico de dos anos fue conducido en intervalos mensuales en dos sitios separados de
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