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    Thermal limitations on chinook salmon spawning habitat in the northern extent of their range

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    Decker_S_2010.pdf
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    Author
    Decker, Samantha Kristin Strom
    Chair
    Margraf, F. Joseph
    Committee
    Rosenberger, Amanda
    Evenson, Matthew
    Keyword
    Chinook salmon
    Spawning
    Alaska
    Chena River
    Effect of temperature on
    Eggs
    Metadata
    Show full item record
    URI
    http://hdl.handle.net/11122/8435
    Abstract
    Pacific salmon (Oncorhynchus) habitat models attempt to balance research efficiency with management effectiveness, however, model transferability between regions remains elusive. To develop efficient habitat models, we must understand the critical elements that limit habitat. At the northern edge of the geographic range for Chinook salmon, O. tschawytscha, water temperature is a probably a limiting habitat factor. This study investigated the spatial and temporal correspondence between water temperature and Chinook salmon spawning on the Chena River, Alaska. Water temperatures were monitored at 21 stations across 220 river kilometers during the 2006 and 2007 spawning seasons and compared to known thermal requirements for egg development. While an absolute upstream thermal boundary to spawning was not discovered, we describe potential temporal limitations in thermal conditions over the spawning season. Our results show that 98.5% of Chinook salmon selected spawning habitat in which their eggs have a 90% probability of accumulating 450 ATUs before freeze up. This suggests not only temperature conditions limit salmon spawning habitat, but also, as expected, water temperatures temporally limit accessible Chinook salmon spawning habitat at the northern edge of their range. This project documents new spawning habitat for the Anadromous Waters Catalog and broadens the geographical range of Chinook salmon thermal habitat research. It also contributes to the understanding of the processes that define salmon habitat, while providing a baseline for further investigations into water temperature in other thermal regimes.
    Description
    Thesis (M.S.) University of Alaska Fairbanks, 2010
    Date
    2010-05
    Type
    Thesis
    Collections
    Fisheries
    Theses supervised by AKCFWRU

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