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dc.contributor.advisorChairperson, Graduate Committee: Daniel Goodman.en
dc.contributor.authorHennen, Daniel Reneauen
dc.coverage.spatialAlaskaen
dc.date.accessioned2013-06-25T18:37:53Z
dc.date.available2013-06-25T18:37:53Z
dc.date.issued2004en
dc.identifier.urihttps://scholarworks.montana.edu/xmlui/handle/1/1460
dc.description.abstractThe Steller sea lion (SSL) population in Alaska was listed as threatened under the Endangered Species Act in 1991. Several procedural restrictions were placed on the commercial fisheries of the region at that time in an effort to reduce the potential for human induced mortality on sea lions. Several years have elapsed since these restrictions were put into place and questions about their efficacy abound. In an effort to determine whether or not fisheries interventions have helped the SSL population to recover, estimates of the fishing activity of the Bering Sea/ Gulf of Alaska commercial fisheries in the vicinity of individual Steller sea lion rookeries and SSL population trends at those rookeries were made using data from the National Marine Fisheries Service (NMFS) Fisheries Observer Program and Steller Sea Lion Adult Count Database. Fisheries data from 1976 - 2000 were analyzed in relation to SSL population counts from 1956 - 2001, at 32 rookeries from the endangered Western Stock. Linear regression on the principal components of the fisheries data show that a positive correlation exists between several metrics of historical fishing activity and SSL population decline. The relationship is less consistent after 1991, supporting a hypothesis that fishing closures around some of the rookeries have been effective in moderating the localized effects of fishing activity on SSL.en
dc.language.isoengen
dc.publisherMontana State University - Bozeman, College of Letters & Scienceen
dc.subject.lcshSteller's sea lion.en
dc.subject.lcshFisheries.en
dc.titleThe Steller sea lion (Eumetopias jubatus) decline and the Gulf of Alaska / Bering Sea commercial fishery
dc.typeDissertation
dc.rights.holderCopyright Daniel Reneau Hennen 2004en
thesis.catalog.ckey1149496en
thesis.degree.committeemembersMembers, Graduate Committee: Thomas Loughlin; Robert Garrott; Bill Quimbyen
thesis.degree.departmentBiological Sciences.en
thesis.degree.genreDissertationen
thesis.degree.namePhDen
thesis.format.extentfirstpage1en
thesis.format.extentlastpage207en
mus.identifier.categoryLife Sciences & Earth Sciences
mus.relation.departmentChemistry & Biochemistry.en_US
mus.relation.universityMontana State University - Bozemanen_US


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