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Sclerochronological records of Arctica islandica from the inner German Bight

Valérie M. Epplé

Research Center for Ocean Margins (RCOM), P.O. Box 330440, 28334 Bremen, Germany, vm_epple{at}yahoo.de

Thomas Brey

Alfred Wegener Institute for Polar- and Marine Research, Bremerhaven, Germany

Rob Witbaard

Netherlands Institute for Sea Research, Texel, The Netherlands

Henning Kuhnert

Department of Geosciences, University of Bremen, Bremen, Germany

Jürgen Pätzold

Research Center for Ocean Margins (RCOM), P.O. Box 330440, 28334 Bremen, Germany, Department of Geosciences, University of Bremen, Bremen, Germany

Sclerochronological records of interannual shell growth variability were established for eight modern shells (26 to 163 years of age) of the bivalve Arctica islandica, which were sampled at one site in the inner German Bight. The records indicate generally low synchrony between individuals. Spectral analysis of the whole 163-yr masterchronology indicated a cyclic pattern with a period of 5 and 7 years. The masterchronology correlated poorly to time series of environmental parameters over the last 90 years. High environmental variability in time and space of the dynamic and complex German Bight hydrographic system results in an extraordinarily high ‘noise’ level in the shell growth pattern of Arctica islandica.

Key Words: Arctica islandica • German Bight • sclerochronology • time series • environmental variability • spectral analysis • masterchronology

The Holocene, Vol. 16, No. 5, 763-769 (2006)
DOI: 10.1191/0959683606hl970rr
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