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The Holocene
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Controls on {delta}18O and {delta}13C profiles within the aragonite bivalve Arctica islandica

L.C. Foster

School of Geography and Geosciences, University of St Andrews, Irvine Building, St Andrews KY16 9AL, UK, l.c.foster{at}bristol.ac.uk

N. Allison

School of Geography and Geosciences, University of St Andrews, Irvine Building, St Andrews KY16 9AL, UK

A.A. Finch

School of Geography and Geosciences, University of St Andrews, Irvine Building, St Andrews KY16 9AL, UK

C. Andersson

Department of Earth Sciences and Bjerknes Centre for Climate Research, University of Bergen, Allegaten 55, 5007 Bergen, Norway

U.S. Ninnemann

Department of Earth Sciences and Bjerknes Centre for Climate Research, University of Bergen, Allegaten 55, 5007 Bergen, Norway

The geochemistry of Arctica islandica shells provides an opportunity to reconstruct intra-annual resolution climate records in temperate latitudes, and the annual banding allows close temporal constraint. Stable isotope analyses of carbon and oxygen from an Arctica islandica live-collected at 6 m depth from Irvine Bay, UK are presented. Seawater temperature ranges reconstructed from shell {delta}18O agree, within error, with instrumental sea surface temperature measurements. The saw-tooth profile of the seasonal {delta} 18O signal (compared with the sinusoidal seawater temperature) indicates that shell accretion rate is not constant throughout the year. Modelling the expected {delta}18O profile from water temperature, salinity and shell growth rate suggest that A. islandica at this site has significant variation in the shell extension rate during the year. Material deposited during shell damage shows a positive shift in {delta}18O. A strong ontogenetic effect is seen in {delta}13C and damage to the shell is associated with a significant (>0.5{per thousand}) and sustained shift of {delta} 13C.

Key Words: Oxygen isotopes • carbon isotopes • growth rates • Arctica islandica • Holocene.

The Holocene, Vol. 19, No. 4, 549-558 (2009)
DOI: 10.1177/0959683609104028
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