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dc.contributor.authorGeiger, Gretchen L.
dc.date.accessioned2020-10-08T23:52:25Z
dc.date.available2020-10-08T23:52:25Z
dc.date.issued2012-12
dc.identifier.urihttp://hdl.handle.net/11122/11316
dc.descriptionThesis (M.S.) University of Alaska Fairbanks, 2012en_US
dc.description.abstractChanges 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.en_US
dc.description.sponsorshipPollock Conservation Cooperative Research Center (to SA and GLG), Alaska Department of Fish and Game (to GMB), and National Marine Fisheries Service (to KW)en_US
dc.language.isoen_USen_US
dc.subjectharbor sealen_US
dc.subjectdieten_US
dc.subjectnutritionen_US
dc.subjectAlaskaen_US
dc.subjectTugidak Islanden_US
dc.titleEvaluation of prey composition and nutritional value of diets of free-ranging harbor seals (Phoca vitulina) from Tugidak Islanden_US
dc.typeThesisen_US
dc.type.degreemsen_US
dc.identifier.departmentMarin Science and Limnology Programen_US
dc.contributor.chairAtkinson, Shannon
dc.contributor.committeeCarpenter, James
dc.contributor.committeeHorstmann-Dehn, Larissa
dc.contributor.committeeWynne, Kate
refterms.dateFOA2020-10-08T23:52:26Z


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