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The impact of sediment deposition and iceberg scour on the Antarctic soft shell clam Laternula elliptica at King George Island, Antarctica

Published online by Cambridge University Press:  26 January 2011

Eva E.R. Philipp ,
Gunnar Husmann  and
Doris Abele
Eva E.R. Philipp*
Affiliation:
Institute of Clinical Molecular Biology, Christian-Albrechts-University Kiel, 24118 Kiel, Germany
Gunnar Husmann
Affiliation:
Institute of Clinical Molecular Biology, Christian-Albrechts-University Kiel, 24118 Kiel, Germany
Doris Abele
Affiliation:
Alfred-Wegener-Institute for Polar and Marine Research, Bremerhaven, 27570 Bremerhaven, Germany
*
[email protected]
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Abstract

Recent rapid changes of air temperature on the western side of the Antarctic Peninsula results in increased sediment discharge and ice scouring frequencies in coastal regions. These changes are bound to especially affect slow growing, sessile filter feeders such as the Antarctic bivalve, Laternula elliptica, a long-lived and abundant key species with circumpolar distribution. We investigated the effect of sedimentation and ice scouring on small/young and large/old individuals at two closely located stations, distinctly influenced by both types of disturbance. Small individuals dealt better with disturbance in terms of their respiratory response to sediment exposure, reburrowing ability, and survival after injury, compared to larger animals. At the more disturbed station L. elliptica population density was lower, but larger animals reburrowed faster after iceberg disturbance and reduced their metabolic rate under strong sediment coverage, compared to larger animals of the less disturbed station, indicating that an adaptation or learning response to both types of disturbance may be possible. Smaller individuals were not influenced. Laternula elliptica seems capable of coping with the rapidly changing environmental conditions. Due to a decrease in population density and mean population lifespan, L. elliptica could however lose its key role in the bentho-pelagic carbon flux in areas of high sediment deposition.

Keywords

Antarctic Peninsulaclimate changefilter feederssedimentationSouth Shetland Islands
Type
Biological Sciences
Information
Antarctic Science , Volume 23 , Issue 2 , April 2011 , pp. 127 - 138
Copyright
Copyright © Antarctic Science Ltd 2011

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