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    Evaluation of prey composition and nutritional value of diets of free-ranging harbor seals (Phoca vitulina) from Tugidak Island

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    Author
    Geiger, Gretchen L.
    Chair
    Atkinson, Shannon
    Committee
    Carpenter, James
    Horstmann-Dehn, Larissa
    Wynne, Kate
    Keyword
    harbor seal
    diet
    nutrition
    Alaska
    Tugidak Island
    Metadata
    Show full item record
    URI
    http://hdl.handle.net/11122/11316
    Abstract
    Changes in climate can cause shifts in ecosystem structure that can affect quantity or quality of prey available to predator populations. Due to sex or age-specific behaviors of predators, certain classes within a population may be more severely impacted by changes in their diet. This study evaluated prey composition and nutritional value of summer diets of harbor seals (Phoca vitulina richardii) from Tugidak Island, Alaska from 2001-2009. The MIXIT-WIN program was used to estimate the nutritional value of average harbor seal diets. Changes in relative abundance of certain prey species were correlated to sea surface temperature anomalies. Despite changes in prey composition, the nutritional value of the average harbor seal diet did not change. Fecal corticosteroid metabolite profiles were analyzed to identify age and sex of individual harbor seals from scats. Profiles obtained from a known adult male harbor seal could be differentiated from those of known adult female and juvenile male seals. Similar profiles were observed in unknown age and sex samples. Even though diet diversity differed between these groups, the nutritional quality of consumed diets was not significantly different. Tugidak Island harbor seals have flexible diets allowing them to capitalize on available prey to maintain their nutritional intake.
    Description
    Thesis (M.S.) University of Alaska Fairbanks, 2012
    Date
    2012-12
    Type
    Thesis
    Collections
    Theses (Marine Biology)
    College of Fisheries and Ocean Sciences

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