Colonization of leaf patches at topographically different locations by insect shredders in a small mountain stream |
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Authors: | Sohei Kobayashi Takashi Kagaya |
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Institution: | (1) Laboratory of Forest Zoology, Graduate School of Agricultural and Life Sciences, University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan;(2) Present address: Water Environment Research Group, Public Works Research Institute, 1-6 Minamihara, Tsukuba Ibaraki, 305-8516, Japan |
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Abstract: | We examined physical constraints on the colonization of leaf patches by shredder individuals by comparing the colonizations
of artificially standardized leaf patches placed at different locations within a stream reach (i.e., riffles, middles and
edges of pools). Stonefly taxa (Nemoura, Protonemura) colonized riffle patches 2–10 times more often than pool (middle, edge) patches, whereas caddisfly taxa (two species of
Lepidostoma, Nothopsyche) almost exclusively colonized pool patches. Colonization also differed between the middle and edge patches in pools for most
taxa; it was 2–5 times greater in edge patches for Nemoura and in middle patches for Lepidostoma. The abilities of species to cope with low oxygen circulation and high shear stress appear to determine differences in colonization
between riffle and pool patches, whereas species-specific dispersion behavior (e.g., return time from drift) may differentiate
colonization between middle and edge patches in pools. Our results suggest that changes in leaf distribution within a reach
can affect the suitability of stream reaches in terms of food acquisition for shredder individuals. |
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Keywords: | Stream Flow conditions Colonization Leaf patches Shredders |
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