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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Language: | English |
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CSIRO Publishing
2013
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Online Access: | http://hdl.handle.net/1993/18341 |
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ftunivmanitoba:oai:mspace.lib.umanitoba.ca:1993/18341 2023-06-18T03:39:27+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) 2013-02-18 application/pdf http://hdl.handle.net/1993/18341 eng eng 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 open access ringed seal feeding ecology Hudson Bay stable isotopes fatty acids master thesis 2013 ftunivmanitoba https://doi.org/10.1071/WR12168 2023-06-04T17:40:31Z 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. May 2013 Master Thesis Arctic Hudson Bay Phoca hispida ringed seal MSpace at the University of Manitoba Arctic Hudson Hudson Bay Wildlife Research 40 1 52 |
institution |
Open Polar |
collection |
MSpace at the University of Manitoba |
op_collection_id |
ftunivmanitoba |
language |
English |
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. May 2013 |
author2 |
Ferguson, Steven H. (Environment and Geography) Baydack, Rick (Environment and Geography) Roth, Jim (Biological Sciences) |
format |
Master Thesis |
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_rights |
open access |
op_doi |
https://doi.org/10.1071/WR12168 |
container_title |
Wildlife Research |
container_volume |
40 |
container_issue |
1 |
container_start_page |
52 |
_version_ |
1769004205619544064 |