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Title: Influence of riparian canopy on macroinvertebrate composition and food habits of juvenile salmonids in several Oregon streams.

Author: Meehan, William R.;

Date: 1996

Source: Res. Pap. PNW-RP-496. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 14 p

Publication Series: Research Paper (RP)

Description: The community composition of macroinvertebrates and the feeding habits of juvenile salmonids were studied in eight Oregon streams. Benthic, drift, sticky trap, and water trap samples were taken over a 3-year period, along with stomach samples of the fish. Samples were taken in stream reaches with and without riparian canopy. Both main effects—fish diet versus macroinvertebrate composition in the environment, and canopies versus noncanopied stream condition—were highly significant, but probably not of practical importance in terms of the amount of preferred food available to the fish. In all aquatic sample types, including fish stomachs, Diptera and Ephemeroptera were the predominant invertebrates collected. In sticky trap and water trap samples, Diptera and Collembola were the predominant orders, reflecting the input of terrestrial invertebrates.

Keywords: Macroinvertebrates, community composition, salmonids, feeding habits, riparian canopy, Oregon

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Meehan, William R. 1996. Influence of riparian canopy on macroinvertebrate composition and food habits of juvenile salmonids in several Oregon streams. Res. Pap. PNW-RP-496. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 14 p

 


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