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dc.contributor.authorHayden, Alison Banks
dc.date.accessioned2018-06-08T01:40:32Z
dc.date.available2018-06-08T01:40:32Z
dc.date.issued2012
dc.identifier.urihttp://hdl.handle.net/11122/8586
dc.descriptionThesis (M.S.) University of Alaska Fairbanks, 2012
dc.description.abstractThe northern fur seal population on the Pribilof Islands has been declining since the 1960s and is now less than 30% of its former size. Chapter 1 examines factors that might cause a population to decrease to such an extent and concludes that only nutritional limitation caused by climate change or commercial fisheries, predation by killer whales, or a combination of factors that includes conditions in the North Pacific during the winter were possible explanations. Chapter 2 reports the seasonal patterns in proximate composition of fur seal milk between St. Paul Island (one of the Pribilof Islands) and Bogoslof Island (an increasing population) to understand the energy requirements of lactation and the energetics of pup growth and body condition at weaning. Factors that caused variability in milk composition included days postpartum, time ashore, individual phenotype, island and preceding trip duration. Average milk lipid increased from 45.5+/-0.7% to 53.8+/-1.0% at St. Paul and from 45.8+/-0.7% to 57.3+/-0.8% at Bogoslof between July and October, while average milk protein remained relatively stable ranging between 10.0% and 10.5%. The lipid content of northern fur seal milk near peak lactation is the highest reported among otariid seals and among the highest known for all mammals.
dc.subjectEcology
dc.subjectEvolution & development
dc.titleVariability In Population Trends, Life History Characteristics, Amd Milk Composition Of Northern Fur Seals In Alaska
dc.typeThesis
dc.type.degreems
dc.identifier.departmentProgram in Marine Science and Limnology
dc.contributor.chairSpringer, Alan
dc.contributor.committeeIverson, Sara
dc.contributor.committeeCastellini, Michael
refterms.dateFOA2020-03-05T16:06:51Z


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