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Seasonal, inter-annual, and spatial variation in ringed seal feeding ecology in Hudson Bay assessed through stable isotope and fatty acid biomarkers

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dc.contributor.supervisor Ferguson, Steven H. (Environment and Geography) en_US
dc.contributor.author Young, Brent G.
dc.date.accessioned 2013-04-04T15:25:39Z
dc.date.available 2013-04-04T15:25:39Z
dc.date.issued 2013-02-18 en_US
dc.identifier.citation Young BG and Ferguson SH. 2013. Seasons of the ringed seal: pelagic open-water hyperphagy, benthic feeding over winter and spring fasting during molt. Wildlife Research, doi: 10.1071/WR12168 en_US
dc.identifier.uri http://hdl.handle.net/1993/18341
dc.description.abstract Current trends toward warmer air temperatures and longer ice free seasons in Hudson Bay are expected to cause changes in Arctic marine ecosystem dynamics. Ringed seals (Phoca hispida) will likely experience changes in levels of predation, competition, and prey availability. The purpose of this thesis was to investigate seasonal, inter-annual, and spatial variation in Hudson Bay ringed seal feeding ecology. Fatty acid composition, δ15N, and δ13C varied significantly by season, suggesting seasonal changes in foraging habitat and diet. Spatial differences in ringed seal stable isotope ratios occurred between western and eastern Hudson Bay, and there was a strong relationship between spring air temperature and δ15N. Peak δ15N occurred within a range in spring air temperatures between approximately -5°C and -2°C. I propose that the high δ15N observed in ringed seals within this temperature range is indicative of relatively greater importance of capelin (Mallotus villosus) in the ringed seal diet. en_US
dc.publisher CSIRO Publishing en_US
dc.subject ringed seal en_US
dc.subject feeding ecology en_US
dc.subject Hudson Bay en_US
dc.subject stable isotopes en_US
dc.subject fatty acids en_US
dc.title Seasonal, inter-annual, and spatial variation in ringed seal feeding ecology in Hudson Bay assessed through stable isotope and fatty acid biomarkers en_US
dc.degree.discipline Environment and Geography en_US
dc.contributor.examiningcommittee Baydack, Rick (Environment and Geography) Roth, Jim (Biological Sciences) en_US
dc.degree.level Master of Science (M.Sc.) en_US
dc.description.note May 2013 en_US


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