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dc.contributor.authorWeiser, Emily L.
dc.date.accessioned2022-03-16T19:13:40Z
dc.date.available2022-03-16T19:13:40Z
dc.date.issued2010-05
dc.identifier.urihttp://hdl.handle.net/11122/12761
dc.descriptionThesis (M.S.) University of Alaska Fairbanks, 2010en_US
dc.description.abstract"Glaucous Gulls are abundant predators in northern Alaska and prey upon several bird species of conservation concern. To assess the benefit gulls may receive from scavenging garbage, I studied diet and reproduction at eight to ten breeding colonies in northern Alaska in 2008-2009. Garbage occurrence in diet was positively correlated with fledging rate; thus any development that increased available garbage could potentially subsidize gull populations through enhanced reproductive success. Garbage could also increase gull populations by enhancing subadult survival. Subadult gulls around the city of Barrow consumed much more garbage than breeding adults, which apparently switch to a mostly natural diet. If garbage enhances subadult survival, more gulls may survive to adulthood, which could impact prey species. When Barrow switched to incinerating garbage instead of disposing it in a landfill, garbage in subadult gull diet decreased. Using stable isotope analysis of gull chick feathers, I found that the diet samples (pellets and food remains) I used in these analyses overestimated gull use of birds and underestimated use of fishes, but usually accurately portrayed relative importance of garbage. Biases in these samples should be considered when assessing the potential impact of gulls on their prey"--Leaf iiien_US
dc.description.sponsorshipNorth Slope Borough Department of Wildlife Management, U.S. Bureau of Land Management, University of Alaska Foundation Angus Gavin Migratory Bird Research Granten_US
dc.description.tableofcontents1. Does garbage in diet improve glaucous gull reproductive output? -- 2. Change in waste management reduces garbage in diet subadult glaucous gulls -- 3. Using stable isotope analysis to evaluate biases in conventional diet samples -- Conclusion.en_US
dc.language.isoen_USen_US
dc.subjectLarusen_US
dc.subjectNorth Slopeen_US
dc.subjectGullsen_US
dc.subjectNutritionen_US
dc.subjectDieten_US
dc.subjectGarbage as feeden_US
dc.subject.otherMaster of Science in Wildlife Biology and Conservationen_US
dc.titleUse of anthropogenic foods by glaucous gulls (Larus hyperboreus) in northern Alaskaen_US
dc.typeThesisen_US
dc.type.degreemsen_US
dc.identifier.departmentDepartment of Biology and Wildlifeen_US
refterms.dateFOA2022-03-16T19:13:42Z


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