Benthic community response to ice algae and phytoplankton in Ny Ålesund, Svalbard McMahon, Kelton W. Ambrose, William G. Johnson, Beverly J. Sun, Ming-Yi Lopez, Glenn R. Clough, Lisa M. Carroll, Michael L. 2011-04-22T18:02:08Z 2011-04-22T18:02:08Z 2006-04-03
dc.description Author Posting. © Inter-Research, 2006. This article is posted here by permission of Inter-Research for personal use, not for redistribution. The definitive version was published in Marine Ecology Progress Series 310 (2006): 1-14, doi:10.3354/meps310001. en_US
dc.description.abstract We assessed the digestibility and utilization of ice algae and phytoplankton by the shallow, subtidal benthos in Ny Ålesund (Kongsfjord) on Svalbard (79°N, 12°E) using chlorophyll a (chl a), essential fatty acids (EFAs) and stable isotopes as tracers of food consumption and assimilation. Intact benthic communities in sediment cores and individuals of dominant benthic taxa were given ice algae, phytoplankton, 13C-enriched ice algae or a no food addition control for 19 to 32 d. Ice algae and phytoplankton had significantly different isotopic signatures and relative concentrations of fatty acids. In the food addition cores, sediment concentrations of chl a and the EFA C20:5(n-3) were elevated by 80 and 93%, respectively, compared to the control after 12 h, but decreased to background levels by 19 d, suggesting that both ice algae and phytoplankton were rapidly consumed. Whole core respiration rates in the ice algae treatments were 1.4 times greater than in the other treatments within 12 h of food addition. In the ice algae treatment, both suspension and deposit feeding taxa from 3 different phyla (Mollusca, Annelida and Sipuncula) exhibited significant enrichment in δ13C values compared to the control. Deposit feeders (15% uptake), however, exhibited significantly greater uptake of the 13C-enriched ice algae tracer than suspension feeders (3% uptake). Our study demonstrates that ice algae are readily consumed and assimilated by the Arctic benthos, and may be preferentially selected by some benthic species (i.e. deposit feeders) due to their elevated EFA content, thus serving as an important component of the Arctic benthic food web. en_US
dc.description.sponsorship Funding for this study came from the National Science Foundation (Grant numbers OPP- 0514115 to W.G.A.; OPP-0222410 to L.M.C.; OPP-0222408 to M.-Y.S.; OPP0222500 to G.R.L.), the Norwegian Research Council (Grant number 151815-720 to M.L.C.), the Howard Hughes Medical Institute through Bates College and the Maine Marine Research Fund. en_US
dc.format.mimetype application/pdf
dc.identifier.citation Marine Ecology Progress Series 310 (2006): 1-14 en_US
dc.identifier.doi 10.3354/meps310001
dc.language.iso en en_US
dc.publisher Inter-Research en_US
dc.subject Ice algae en_US
dc.subject Phytoplankton en_US
dc.subject Food quality en_US
dc.subject Arctic benthos en_US
dc.subject Climate change en_US
dc.subject Stable isotopes en_US
dc.subject Essential fatty acids en_US
dc.subject Svalbard en_US
dc.title Benthic community response to ice algae and phytoplankton in Ny Ålesund, Svalbard en_US
dc.type Article en_US
dspace.entity.type Publication
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