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    Population dynamics of Pacific herring and humpback whales, Sitka Sound, Alaska 1981-2011

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    Author
    Liddle, Joseph B.
    Chair
    Quinn, Terrance II
    Committee
    Hillgruber, Nicola
    Adkison, Milo
    Straley, Janice
    Metadata
    Show full item record
    URI
    http://hdl.handle.net/11122/6099
    Abstract
    Humpback whales are a major predator in Sitka Sound, possibly consuming as much as a half-ton of Pacific herring per day. These large migratory baleen whales congregate in Sitka Sound to feed on schools of Pacific herring which spawn in April. In recent decades humpback whale abundance has increased tremendously in Sitka Sound after recovering from near extinction due to commercial whaling. In order to assess the long-term impact on herring by humpback whales, I estimated humpback whale abundance from 1981 to 2011. To do so I developed a Bayesian mark-recapture method for small sample sizes. I also modified a multi-strata Hilborn model to account for sporadic availability of whales in Sitka Sound. The multi-million dollar sac roe fishery in Sitka Sound is managed by the Alaska Department of Fish and Game (ADF&G) with an Age-Structured Assessment model (ASA). I modified the standard ASA model by including the humpback whale abundance estimates as a covariate for herring natural mortality. I found that there is no significant effect of humpback whales on herring mortality. In fact, both Pacific herring and humpback whale abundance have increased together, reaching their maximum values in 2011. This suggests that some other factor, perhaps better marine survival for both species, is driving their upwards trend.
    Description
    Dissertation (Ph.D.) University of Alaska Fairbanks, 2015
    Date
    2015-08
    Type
    Dissertation
    Collections
    Fisheries

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