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dc.contributor.authorGraff, Nathan R.
dc.date.accessioned2021-12-16T23:18:26Z
dc.date.available2021-12-16T23:18:26Z
dc.date.issued2021-08
dc.identifier.urihttp://hdl.handle.net/11122/12615
dc.descriptionThesis (M.S.) University of Alaska Fairbanks, 2021en_US
dc.description.abstractSpectacled eiders (Somateria fischeri) nest and raise their broods in coastal areas of the Yukon-Kuskokwim Delta, which may be vulnerable to projected climate change effects of increased temperatures, storms, and sea level rise. These changes in turn will likely affect wetland salinity levels used by ducklings, which are a potential constraint to growth and survival of young ducklings while their salt glands develop. To examine this potential concern, I investigated spatial and temporal pond salinity dynamics, food availability, and habitat use of spectacled eider broods at Kigigak Island, AK during 2011-2012. I found that salinity was highly variable across the island, ranging from 0-23.9 ppt and averaged 4.9-12.9 ppt in ponds at brood observation sites during the first 30 days of brood rearing. Salinity typically increased through the summer across all habitat types, but at the highest rate in high sedge habitat. The most common invertebrate taxonomic groups included Eurytemora, Harpacticoida, Annelida, and Chironomidae, which were found in nearly all ponds sampled with salinity ranging from 0.7- 16.1 ppt. Neither salinity nor invertebrate abundance explained pond foraging use by broods. Additionally, I used robust design occupancy models to estimate brood foraging patterns. Pond occupancy ranged from 0.43-0.59 between years. Overall, brood use of ponds was not dictated by salinity levels or invertebrates present, suggesting that most ponds provide suitable brood rearing habitat. I did not detect any obvious constraint to pond use within brood rearing habitat under the environmental conditions encountered.en_US
dc.description.sponsorshipU.S. Fish and Wildlife Service and Alaska SeaLife Centeren_US
dc.description.tableofcontentsGeneral introduction -- Chapter 1: Salinity and food availability in wetlands used by spectacled eiders (Somateria fischeri) during brood rearing on the Yukon-Kuskokwim Delta, Alaska -- Chapter 2: Habitat use of spectacled eider (Somateria fischeri) broods on the Yukon-Kuskokwim Delta, Alaska -- General conclusions -- Literature cited.en_US
dc.language.isoen_USen_US
dc.subjectSpectacled eideren_US
dc.subjectHabitaten_US
dc.subjectNestsen_US
dc.subjectDieten_US
dc.subjectYukon-Kuskokwim Deltaen_US
dc.subjectSalinityen_US
dc.subject.otherMaster of Science in Wildlife Biology and Conservationen_US
dc.titleHabitat use of spectacled eider broods in relation to salinity and food availability on the Yukon-Kuskokwim Delta, Alaskaen_US
dc.typeThesisen_US
dc.type.degreemsen_US
dc.identifier.departmentWildlife Biology and Conservation Programen_US
dc.contributor.chairLindberg, Mark
dc.contributor.committeeHollmén, Tuula
dc.contributor.committeeKnut, Kielland
refterms.dateFOA2021-12-16T23:18:26Z


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