Abstract
Stream sections from which American dippers (Cinclus mexicanus) were excluded contained higher densities of the limnephilid caddisfly Dicosmoecus gilvipes than exclosure-control sections after 16 d in Wheeler Creek, Utah, USA. Dipper exclusion produced no detectable effect on the density of large Baetis mayflies on exposed surfaces, while the effect of dipper exclusion on small Baetis depended on water depth. Exposed heptageniid mayflies were more abundant in dipper exclosures. Densities of Dicosmoecus and mayflies did not differ between exclosure-controls and unmanipulated stream sections. Perhaps in response to dipper predation, Dicosmoecus occupied relatively deep microhabitats in Wheeler Creek. The estimate of Dicosmoecus conssumption by dippers from our experiment parallels estimates from studies of the food habits and bioenergetics of European dippers
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