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dc.contributor.authorCarroll, Michael L.
dc.contributor.authorJohnson, Beverly J.
dc.contributor.authorHenkes, Gregory A.
dc.contributor.authorMcMahon, Kelton W.
dc.contributor.authorVoronkov, Andrey
dc.contributor.authorAmbrose, William G.
dc.contributor.authorDenisenko, Stanislav G.
dc.date.accessioned2009-08-20T13:03:31Z
dc.date.available2009-08-20T13:03:31Z
dc.date.issued2009-04
dc.identifier.urihttp://hdl.handle.net/1912/2931
dc.descriptionAuthor Posting. © Elsevier B.V., 2009. This is the author's version of the work. It is posted here by permission of Elsevier B.V. for personal use, not for redistribution. The definitive version was published in Marine Pollution Bulletin 59 (2009): 193-206, doi:10.1016/j.marpolbul.2009.02.022.en
dc.description.abstractIdentifying patterns and drivers of natural variability in populations is necessary to gauge potential effects of climatic change and the expected increases in commercial activities in the Arctic on communities and ecosystems. We analyzed growth rates and shell geochemistry of the circumpolar Greenland smooth cockle, Serripes groenlandicus, from the southern Barents Sea over almost 70 years between 1882 and 1968. The datasets were calibrated via annually-deposited growth lines, and growth, stable isotope (δ18O, δ13C), and trace elemental (Mg, Sr, Ba, Mn) patterns were linked to environmental variations on weekly to decadal scales. Standardized growth indices revealed an oscillatory growth pattern with a multi-year periodicity, which was inversely related to the North Atlantic Oscillation Index (NAO), and positively related to local river discharge. Up to 60% of the annual variability in the Ba/Ca could be explained by variations in river discharge at the site closest to the rivers, but the relationship disappeared at a more distant location. Patterns of δ18O, δ13C, and Sr/Ca together provide evidence that bivalve growth ceases at elevated temperatures during the fall and recommences at the coldest temperatures in the early spring, with the implication that food, rather than temperature, is the primary driver of bivalve growth. The multi-proxy approach of combining the annually integrated information from the growth results and higher resolution geochemical results yielded a robust interpretation of biophysical coupling in the region over temporal and spatial scales. We thus demonstrate that sclerochronological proxies can be useful retrospective analytical tools for establishing a baseline of ecosystem variability in assessing potential combined impacts of climatic change and increasing commercial activities on Arctic communities.en
dc.description.sponsorshipWe gratefully acknowledge past financial support from Norsk Hydro, and continuing financial support from StatoilHydro, the Norwegian Research Council, and the Howard Hughes Medical Institute through Bates College. This publication was made possible, in part, by NIH Grant Number P20 RR-016463 from the INBRE Program of the National Center for Research Resources.en
dc.format.mimetypeapplication/pdf
dc.language.isoenen
dc.relation.urihttps://doi.org/10.1016/j.marpolbul.2009.02.022
dc.subjectArcticen
dc.subjectBarents Seaen
dc.subjectBenthic communityen
dc.subjectBivalve growthen
dc.subjectClimate oscillationen
dc.subjectEnvironmental forcingen
dc.subjectNorth Atlantic Oscillationen
dc.subjectWhite Seaen
dc.subjectSclerochronologyen
dc.subjectSerripes groenlandicusen
dc.subjectShell geochemistryen
dc.subjectStable isotopesen
dc.subjectTrace element ratiosen
dc.titleBivalves as indicators of environmental variation and potential anthropogenic impacts in the southern Barents Seaen
dc.typePreprinten


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