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CARBON AND NITROGEN ASSIMILATION IN THE CLAMS NUCULANA RADIATA AND MACOMA MOESTA FROM THE BERING SEA

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dc.contributor.author Weems, Jared
dc.date.accessioned 2014-11-05T20:05:31Z
dc.date.available 2014-11-05T20:05:31Z
dc.date.issued 2011-08
dc.identifier.uri http://hdl.handle.net/11122/4659
dc.description Thesis (M.S.) University of Alaska Fairbanks, 2011
dc.description.abstract The predicted climate-induced reduction in sea ice presence in the Bering Sea could impact benthic trophic interactions; however, species-specific consumer dependence on ice algal production is largely unknown. My objective was to track feeding in the benthic clams, Nuculana radiata and Macoma moesta, using stable carbon and nitrogen isotopes. Nuculana radiata had slow isotopic assimilation rates, with lipids taking up isotope markers fastest and muscle tissue the slowest. Lipids may thus be particularly suitable to track the immediate ingestion of sea ice algal export in benthic consumers. When isotopically enriched food was added to natural sediment cores, N. radiata assimilated 60% less of the isotope markers than when feeding on algal food in isolation. Possibly, this difference is related to the ingestion of other, naturally present food sources in the sediment. Macoma moesta showed 30% higher isotopic assimilation compared to N. radiata in sediment cores. I suggest that differing feeding behaviors between the species provide differential access to the sedimented algal food. Based on these results, N. radiata is likely better able to utilize food sources buried in the sediment and may be more competitive over M. moesta under conditions of reduced ice algal production in the northern Bering Sea. en_US
dc.publisher University of Alaska Fairbanks en_US
dc.title CARBON AND NITROGEN ASSIMILATION IN THE CLAMS NUCULANA RADIATA AND MACOMA MOESTA FROM THE BERING SEA en_US
dc.type Thesis en_US
dc.type.degree ms
dc.identifier.department Program in Marine Science and Limnology
dc.contributor.chair Iken, Katrin
dc.contributor.chair Gradinger, Rolf
dc.contributor.committee Wooller, Matthew


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