Seasonal, inter-annual, and spatial variation in ringed seal feeding ecology in Hudson Bay assessed through stable isotope and fatty acid biomarkers
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 thesi...
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ftcanadathes:oai:collectionscanada.gc.ca:MWU.1993/18341 2023-05-15T15:05:22+02:00 Seasonal, inter-annual, and spatial variation in ringed seal feeding ecology in Hudson Bay assessed through stable isotope and fatty acid biomarkers Young, Brent G. Ferguson, Steven H. (Environment and Geography) Baydack, Rick (Environment and Geography) Roth, Jim (Biological Sciences) 2013-04-04T15:25:39Z http://hdl.handle.net/1993/18341 unknown CSIRO Publishing 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 http://hdl.handle.net/1993/18341 ringed seal feeding ecology Hudson Bay stable isotopes fatty acids 2013 ftcanadathes https://doi.org/10.1071/WR12168 2014-03-30T00:55:27Z 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. Other/Unknown Material Arctic Hudson Bay Phoca hispida ringed seal Theses Canada/Thèses Canada (Library and Archives Canada) Arctic Hudson Hudson Bay Wildlife Research 40 1 52 |
institution |
Open Polar |
collection |
Theses Canada/Thèses Canada (Library and Archives Canada) |
op_collection_id |
ftcanadathes |
language |
unknown |
topic |
ringed seal feeding ecology Hudson Bay stable isotopes fatty acids |
spellingShingle |
ringed seal feeding ecology Hudson Bay stable isotopes fatty acids Young, Brent G. Seasonal, inter-annual, and spatial variation in ringed seal feeding ecology in Hudson Bay assessed through stable isotope and fatty acid biomarkers |
topic_facet |
ringed seal feeding ecology Hudson Bay stable isotopes fatty acids |
description |
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. |
author2 |
Ferguson, Steven H. (Environment and Geography) Baydack, Rick (Environment and Geography) Roth, Jim (Biological Sciences) |
author |
Young, Brent G. |
author_facet |
Young, Brent G. |
author_sort |
Young, Brent G. |
title |
Seasonal, inter-annual, and spatial variation in ringed seal feeding ecology in Hudson Bay assessed through stable isotope and fatty acid biomarkers |
title_short |
Seasonal, inter-annual, and spatial variation in ringed seal feeding ecology in Hudson Bay assessed through stable isotope and fatty acid biomarkers |
title_full |
Seasonal, inter-annual, and spatial variation in ringed seal feeding ecology in Hudson Bay assessed through stable isotope and fatty acid biomarkers |
title_fullStr |
Seasonal, inter-annual, and spatial variation in ringed seal feeding ecology in Hudson Bay assessed through stable isotope and fatty acid biomarkers |
title_full_unstemmed |
Seasonal, inter-annual, and spatial variation in ringed seal feeding ecology in Hudson Bay assessed through stable isotope and fatty acid biomarkers |
title_sort |
seasonal, inter-annual, and spatial variation in ringed seal feeding ecology in hudson bay assessed through stable isotope and fatty acid biomarkers |
publisher |
CSIRO Publishing |
publishDate |
2013 |
url |
http://hdl.handle.net/1993/18341 |
geographic |
Arctic Hudson Hudson Bay |
geographic_facet |
Arctic Hudson Hudson Bay |
genre |
Arctic Hudson Bay Phoca hispida ringed seal |
genre_facet |
Arctic Hudson Bay Phoca hispida ringed seal |
op_relation |
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 http://hdl.handle.net/1993/18341 |
op_doi |
https://doi.org/10.1071/WR12168 |
container_title |
Wildlife Research |
container_volume |
40 |
container_issue |
1 |
container_start_page |
52 |
_version_ |
1766337077633351680 |