Heterogeneous currents and algal resources mediate in situ foraging activity of a mobile stream grazer

The importance of spatial heterogeneity in near-bed currents and algal ressource patchiness in regulating the movement patterns, foraging activities, and distribution of the mobile stream insect, Agapetus boulderensis Milne (Glossosomatidae: Trichoptera) was investigated with field observational studies and field experiments. Nearbed current velocities were characterized for topographically-complex substrata concurrently with spatial patterns of algal density and taxonomic composition. Activities of self-marked mobile larvae were examined in relationship to mapped current and algal resources

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