Characterization of pools and reaches with salmonid species in the Alsea and Nestucca Sub-Basins Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/0z708z55d

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  • Streams in the Alsea and Nestucca Sub-Basins were characterized using suites of habitat attributes at the pool and reach scales. These suites were analyzed using a multivariate process with the Multiple Response Permutation Procedure (MRPP) to test for differences in groups. There were differences in the suite of habitat variables between pools with cutthroat trout, coho salmon, steelhead trout and those corresponding pools without those species. Further, there were differences in a second suite of habitat variables at the reach level. These differences were between reaches with cutthroat trout, coho salmon, steelhead trout and those without. These individual species were then grouped together to comprise salmonid communities. The groups consisted of pools and reaches with one, two and all three species present. These six groups were tested using MRPP. Differences were found between all salmonid communities and their corresponding pools or reaches without the community present. Each species and community group was then fully described at the pool and reach ecological level. Additionally each suite of habitat variables was graphed as a percentage of the full distribution mean. This allowed the habitat suite to be viewed on the same scale. The graph line connecting the individual variables provided both species and community specific response curves or signatures. These signatures were then compared and contrasted against one another at the species, community and sub-basin contexts. Each species or community expressed its own unique signature that quantitatively described habitat partitioning and community interactions. The response curves may be used to guide land managers in restoration activities. These signatures provide insight into species and community specific utilization of pools and reaches. In addition they also provide understanding into how the individual habitat characteristics operate together in a suite attributes.
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