期刊
MARINE ECOLOGY PROGRESS SERIES
卷 627, 期 -, 页码 33-48出版社
INTER-RESEARCH
DOI: 10.3354/meps13071
关键词
Sea ice; Ice algae; Carbon sources; Climate change; Fatty acids; Stable isotopes; Canadian; Arctic; Eclipse Sound; Pond Inlet
资金
- Fisheries and Oceans Canada Strategic Program for Ecosystem-Based Research and Advice (SPERA)
- DFO's Marine Productivity Laboratory funds
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- NSERC Visiting Fellowship in Canadian Laboratory by SPERA
We investigated the role of sea ice-derived carbon in the food web of Eclipse Sound, Canadian Arctic during the spring ice-covered season to understand the potential ecological impact of changes to the sea-ice habitat. Chlorophyll a (chl a) concentrations in the bottom of sea ice (438.2 +/- 154.2 mu g l(-1), 19.8 +/- 6.6 mg m(-2)) were more than 2 orders of magnitude higher than in surface waters (0.9 +/- 0.7 mu g l(-1)). Fatty acid (FA) composition showed that algal communities in the bottom sea ice comprised higher abundances of diatoms compared to surface waters. Benthic invertebrates (ophiuroids, polychaetes) and sediments had high proportions of diatom-associated FAs in their lipid composition. H-Print estimates of the proportional contributions of sea icederived carbon to the carbon pool of the benthic community were substantial, ranging on average between 77 and 85%. High carbon stable isotope values (delta C-13) in benthic invertebrates and sediments (delta C-13: -19.6 to -11.6%) further suggests that a large portion of the benthic carbon pool was of sea-ice origin, while surface waters were significantly lower (delta C-13: -22.32 +/- 2.17%). In this ecosystem where landfast ice is present for most of the year, strong sea ice-benthic coupling emphasizes the dependency of the food web on ice productivity. As timing and magnitude of sea icederived carbon will change under alterations of climatic conditions and possibly with increased shipping activities in the study region, the adaptive capacity of sea ice-dependent species is anticipated to play a key role in determining future food webs.
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