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    Estimating westslope cutthroat trout (Oncorhynchus clarkii lewisi) movements in a river network using strontium isoscapes

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    Muhlfeld et al (CJFAS)_2012.pdf (523.5Kb)
    Date
    2012-04-20
    Author
    Muhlfeld, Clint C.  Concept link
    Thorrold, Simon R.  Concept link
    McMahon, Thomas E.  Concept link
    Marotz, Brian  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/5205
    As published
    https://doi.org/10.1139/f2012-033
    Related Material/Data
    https://hdl.handle.net/1912/5249
    DOI
    10.1139/f2012-033
    Abstract
    We used natural variation in the strontium concentration (Sr:Ca) and isotope composition (87Sr:86Sr) of stream waters and corresponding values recorded in otoliths of westslope cutthroat trout (Oncorhynchus clarkii lewisi) to examine movements during their life history in a large river network. We found significant spatial differences in Sr:Ca and 87Sr:86Sr values (strontium isoscapes) within and among numerous spawning and rearing streams that remained relatively constant seasonally. Both Sr:Ca and 87Sr:86Sr values in the otoliths of juveniles collected from nine natal streams were highly correlated with those values in the ambient water. Strontium isoscapes measured along the axis of otolith growth revealed that almost half of the juveniles had moved at least some distance from their natal streams. Finally, otolith Sr profiles from three spawning adults confirmed homing to natal streams and use of nonoverlapping habitats over their migratory lifetimes. Our study demonstrates that otolith geochemistry records movements of cutthroat trout through Sr isoscapes and therefore provides a method that complements and extends the utility of conventional tagging techniques in understanding life history strategies and conservation needs of freshwater fishes in river networks.
    Description
    This paper is not subject to U.S. copyright. The definitive version was published in Canadian Journal of Fisheries and Aquatic Sciences 69 (2012): 906-915, doi:10.1139/f2012-033.
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    Suggested Citation
    Canadian Journal of Fisheries and Aquatic Sciences 69 (2012): 906-915
     
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