期刊
MARINE MAMMAL SCIENCE
卷 30, 期 2, 页码 706-725出版社
WILEY
DOI: 10.1111/mms.12075
关键词
capelin; carbon; diet shift; feeding ecology; Hudson Bay; nitrogen; Pusa hispida; SIBER
资金
- Natural Sciences and Engineering Research Council (NSERC)
- Federal Program Office of International Polar Year
- Nunavut Wildlife Management Board (NWMB)
- University of Manitoba
- ArcticNet
- Fisheries Oceans Canada
Trends toward increased temperatures, reduced sea ice extent, and longer open water seasons have resulted in changing Arctic ecosystem dynamics. Expected changes include shifts in distribution and abundance of prey species for seabirds and marine mammals. Using stable isotope analysis, we studied spatial and interannual variation in ringed seal (Pusa hispida) feeding ecology in Hudson Bay in relation to environmental variables, between 2003 and 2010. Ringed seal muscle and hair samples collected from Arviat and Sanikiluaq, Nunavut, were analyzed for stable isotope ratios of nitrogen (N-15) and carbon (C-13). Seals from western Hudson Bay (Arviat) had higher N-15 and lower C-13 than seals from eastern Hudson Bay (Sanikiluaq), and stable isotope ratios varied interannually within each region. Peak N-15 occurred in years with spring air temperatures between approximately -5 degrees C and -2 degrees C. This temperature range was characteristic of warm years in western Hudson Bay and cool years in eastern Hudson Bay. We hypothesize that the high N-15 observed in ringed seals is indicative of greater importance of capelin (Mallotus villosus) in ringed seal diet. A comparison of ringed seal isotopic niche widths indicated greater dietary differences between western and eastern Hudson Bay with warming, suggesting a possible ecological divergence related to climate change.
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