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Effects of woody debris on anadromous salmonid habitat, Prince of Wales Island, southeast AlaskaAuthor(s): Thomas E. Lisle
Source: North American Journal of Fisheries Management 6: 538-550.
Publication Series: Miscellaneous Publication
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DescriptionAbstract - The effects of woody debris on anadromous salmonid habitat in eight streams on Prince of Wales Island, southeast Alaska, were investigated by comparing low-gradient (1-9%) first- or second-order streams flowing through either spruce-hemlock forests or 6-10-year-old clearcuts, and by observing changes after debris was selectively removed from clear-cut reaches. Woody debris decreased the rate of shallowing as discharge decreased, thus helping to preserve living space for fish during critical low-flow periods. Debris dams were more frequent in clear-cut streams (14.9/100 m), which contained more debris, than in forested streams (4.2/100 m). As a result, total residual pool length (length when pools are filled with water but there is no flow) and length of channel with residual depth greater than 14 cm-the depth range occupied by 84% of coho salmon (Oncorhynchus kisutch)-were greater in clear-cut streams than in forested streams.
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CitationLisle, Thomas E. 1986. Effects of woody debris on anadromous salmonid habitat, Prince of Wales Island, southeast Alaska. North American Journal of Fisheries Management 6: 538-550.
KeywordsPSW4351, anadromous salmonid, Prince of Wales Island, Alaska, streams, clearcuts, debris dams, woody debris, morphology, riparian zone, pools
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