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    A retrospective assessment of primary productivity on the Bering and Chukchi Sea shelves using stable isotope ratios in seabirds

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    Abromaitis.Grace.2000.pdf
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    Author
    Abromaitis, Grace Elizabeth
    Chair
    Schell, Donald
    Committee
    Castellini, Michael
    Springer, Alan
    Metadata
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    URI
    http://hdl.handle.net/11122/4944
    Abstract
    Recent declines of marine mammal seabird populations in the Bering Sea have raised the question of whether the changes are caused by fishing pressure or a decrease in ecosystem carrying capacity. Stable carbon (¹³C⁾ and nitrogen (¹⁵N⁾ isotope ratios in Thick⁻billed Murre muscle and feathers were used as indicators of changing seasonal primary production. ¹³C values in phytoplankton vary directly with growth rates and are passed up the food web to consumers. Muscle and feather ¹³C values decreased over the period 1976-1998 suggesting a decline in Bering/Chukchi continental shelf primary production. Carbon isotope ratios in murres were correlated with bowhead whale baleen isotope ratios and to some climate indices. In contrast, ¹⁵N values in the birds showed no significant change indicating no concurrent shifts in trophic status.
    Description
    Thesis (M.S.) University of Alaska Fairbanks, 2000
    Date
    2000-12
    Type
    Thesis
    Collections
    Marine Sciences

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