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Floodplain emergent wetlands as rearing habitat for fishes and the implications for wetland enhancement

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dc.contributor.advisor Gresswell, Robert E.
dc.contributor.advisor Fleming, Ian A.
dc.creator Henning, Julie A.
dc.date.accessioned 2011-08-08T20:51:47Z
dc.date.available 2011-08-08T20:51:47Z
dc.date.copyright 2005-02-28
dc.date.issued 2005-02-28
dc.identifier.uri http://hdl.handle.net/1957/22454
dc.description Graduation date: 2005 en_US
dc.description.abstract Seasonal emergent wetlands in the Pacific Northwest have not been regarded traditionally as fish rearing habitat, despite access to such habitat when river flows overtop riverbanks and connect to the floodplain. As a result, restoration and enhancement projects to remediate for the loss of such wetland habitat are being implemented for waterfowl and other wildlife with little consideration for fishes such as juvenile salmon (Oncorhynchus spp.). The objectives of this study were to examine the degree to which fish utilize emergent wetlands and to determine the influence of wetland enhancement on fish communities in the Chehalis River floodplain. Furthermore, I quantified the influence of enhanced wetlands on juvenile coho salmon. A minimum of 18 fish species utilized floodplain wetlands, and the most abundant were three-spine stickleback (Gasterosteus aculeatus) and Olympic mudminnow (Novumbra hubbsi). Both enhanced and unenhanced emergent wetlands had higher abundances of nongame native fishes than oxbow habitats. Coho salmon (Oncorhynchus kisutch) was the dominant salmonid at all sites and enhanced wetlands had significantly higher abundances of yearling coho salmon than unenhanced wetlands. Dissolved oxygen concentrations decreased in emergent wetlands throughout the season and were near lethal limits for juvenile salmon by June each year. Survival of fishes utilizing emergent wetlands was dependent on movement to the river before water quality decreased and/or the wetland became isolated and stranding occurred. Emigration patterns suggested that coho salmon yearling and young-of-the-year emigrated as habitat conditions declined. This was further supported by the results of the experimental release of yearling coho salmon. Yearling coho salmon benefited from rearing in enhanced wetland habitats where their growth and survival were comparable to studies of juvenile coho off-channel habitats. en_US
dc.language.iso en_US en_US
dc.subject.lcsh Coho salmon -- Washington (State) -- Chehalis River Watershed en_US
dc.subject.lcsh Coho salmon -- Habitat -- Washington (State) -- Chehalis River Watershed en_US
dc.subject.lcsh Fishes -- Habitat -- Washington (State) -- Chehalis River Watershed en_US
dc.subject.lcsh Vernal pools -- Washington (State) -- Chehalis River Watershed en_US
dc.subject.lcsh Wetlands -- Washington (State) -- Chehalis River Watershed en_US
dc.subject.lcsh Floodplains -- Washington (State) -- Chehalis River Watershed en_US
dc.title Floodplain emergent wetlands as rearing habitat for fishes and the implications for wetland enhancement en_US
dc.type Thesis/Dissertation en_US
dc.degree.name Master of Science (M.S.) in Fisheries Science en_US
dc.degree.level Master's en_US
dc.degree.discipline Agricultural Sciences en_US
dc.degree.grantor Oregon State University en_US
dc.description.digitization File scanned at 300 ppi (Monochrome, 8-bit Grayscale) using ScandAll PRO 1.8.1 on a Fi-6670 in PDF format. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR. en_US
dc.description.peerreview no en_us

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