Bivalves as indicators of environmental variation and potential anthropogenic impacts in the southern Barents Sea Carroll, Michael L. Johnson, Beverly J. Henkes, Gregory A. McMahon, Kelton W. Voronkov, Andrey Ambrose, William G. Denisenko, Stanislav G. 2009-08-20T13:03:31Z 2009-08-20T13:03:31Z 2009-04
dc.description Author 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.abstract Identifying 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.sponsorship We 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.mimetype application/pdf
dc.language.iso en en
dc.subject Arctic en
dc.subject Barents Sea en
dc.subject Benthic community en
dc.subject Bivalve growth en
dc.subject Climate oscillation en
dc.subject Environmental forcing en
dc.subject North Atlantic Oscillation en
dc.subject White Sea en
dc.subject Sclerochronology en
dc.subject Serripes groenlandicus en
dc.subject Shell geochemistry en
dc.subject Stable isotopes en
dc.subject Trace element ratios en
dc.title Bivalves as indicators of environmental variation and potential anthropogenic impacts in the southern Barents Sea en
dc.type Preprint en
dspace.entity.type Publication
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