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    The use of aerial imagery to map in-stream physical habitat related to summer distribution of juvenile salmonids in a Southcentral Alaskan stream

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    Perschbacher_J_2011.pdf
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    Author
    Perschbacher, Jeff
    Chair
    Margraf, F. Joseph
    Committee
    Hasbrouck, James
    Wipfli, Mark
    Prakash, Anupma
    Keyword
    salmonidae
    habitat
    Southcentral Alaska
    remote sensing
    summering
    infancy
    Chinook salmon
    rivers
    ecology
    Metadata
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    URI
    http://hdl.handle.net/11122/10939
    Abstract
    Airborne remote sensing (3-band multispectral imagery) was used to assess in-stream physical habitat related to summer distributions of juvenile salmonids in a Southcentral Alaskan stream. The objectives of this study were to test the accuracy of using remote sensing spectral and spatial classification techniques to map in-stream physical habitat, and test hypotheses of spatial segregation of ranked densities of juvenile chinook salmon Oncorhynchus tschwytscha, coho salmon O. kisutch, and rainbow trout O. mykiss, related to stream order and drainage. To relate habitat measured with remote sensing to fish densities, a supervised classification technique based on spectral signature was used to classify riffles, non-riffles, vegetation, shade, gravel, and eddy drop zones, with a spatial technique used to classify large woody debris. Combining the two classification techniques resulted in an overall user's accuracy of 85%, compared to results from similar studies (11-80%). Densities of juvenile salmonids was found to be significantly different between stream orders, but not between the two major drainages. Habitat data collected along a 500-meter stream reach were used successfully to map in-stream physical habitat for six river-kilometers of a fourth-order streams. The use of relatively inexpensive aerial imagery to classify in-stream physical habitats is cost effective and repeatable for mapping over large areas, and should be considered an effective tool for fisheries and land-use managers.
    Description
    Thesis (M.S.) University of Alaska Fairbanks, 2011
    Date
    2011-12
    Type
    Thesis
    Collections
    Fisheries
    Theses supervised by AKCFWRU

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