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    Longitudinal distribution patterns and habitat associations of juvenile coho salmon Oncorhynchus kisutch in tributaries of the Little Susitna River, Alaska

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    Foley_uaf_0006N_10151.pdf
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    Author
    Foley, Kevin Michael
    Chair
    Rosenberger, Amanda E.
    Committee
    Gerkin, Jonathon
    Verbyla, David L.
    Mueter, Franz J.
    Metadata
    Show full item record
    URI
    http://hdl.handle.net/11122/4544
    Abstract
    Understanding how headwater streams function as rearing habitats for juvenile coho salmon Oncorhynchus kisutch is essential for effective population management and conservation. To inform habitat restoration activities within the Matanuska-Susitna Valley, Alaska, I determined upstream distribution limits, validated abundance estimates, and established fish habitat relationships in two headwater stream tributaries of the Little Susitna River in 2010-11. Using a low-effort, spatially continuous sampling approach and linear mixed-effects models, I related local- and landscape-scale habitat associations to abundance estimates. All-aged coho salmon composed approximately 98% of all fish sampled and inhabited the entire stream length to their upstream limits. Age-1+ fish resided in 64% and 44% of the stream length for the two sampled streams. The mean upstream elevation limit for all-aged fish in these streams was 278m and 267m. For age- 1+ fish, the upstream elevation limit in the two streams was 275m and 238m. Percent slope at the distribution limit of all-aged fish was consistent across streams at 5%, whereas percent slope for age-1+ fish correspond to 4% and 6%. Elevation and percent slope consistently described upstream distribution limits among age classes. Therefore, we must consider these landscape features when prioritizing restoration projects in headwater streams.
    Description
    Thesis (M.S.) University of Alaska Fairbanks, 2014
    Date
    2014-05
    Type
    Thesis
    Collections
    Fisheries
    Theses supervised by AKCFWRU

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