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A fistful of shells: amplifying sclerochronological and palaeoclimate signals from molluscan death assemblages

Published online by Cambridge University Press:  15 July 2009

S. HELAMA ,
J. K. NIELSEN ,
M. MACIAS FAURIA  and
I. VALOVIRTA
S. HELAMA*
Affiliation:
Department of Geology, P.O. Box 64, 00014 University of Helsinki, Finland
J. K. NIELSEN
Affiliation:
StatoilHydro, TNE SST Reservoir Technology, IOR Studies, P.O. Box 273, 7501 Stjørdal, Norway
M. MACIAS FAURIA
Affiliation:
Biogeoscience Institute, 2500 University Drive N.W., University of Calgary, Calgary AB, T2N 1N4, Canada
I. VALOVIRTA
Affiliation:
Finnish Museum of Natural History, P.O. Box 17, 00014 University of Helsinki, Finland
*
†Author for correspondence: [email protected]
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Abstract

A growing body of literature is using sclerochronological information to infer past climates. Sclerochronologies are based on series of skeletal growth records of molluscs that have been correctly aligned in time. Incremental series are obtained from a number of shells to assess the temporal control and improve the climate signal in the final chronology. Much of the sclerochronological theory has been adopted from tree-ring science, due to the longer tradition and more firmly established concepts of chronology construction in dendrochronology. Compared to tree-ring studies, however, sclerochronological datasets are often characterized by relatively small sample size. Here we evaluate how effectively palaeoclimatic signal can be extracted from such a suite of samples. In so doing, the influences of the very basic methods that are applied in nearly every sclerochronological study to remove the non-climatic growth variability prior to palaeoclimatic interpretations, are ranked by their capability to amplify the desired signal. The study is performed in the context of six shells that constitute a bicentennial growth record from annual shell increments of freshwater pearl mussel. It was shown that when the individual series were detrended using the models set by the mean or the median summary curves for ageing (that is, applying Regional Curve Standardization, RCS), instead of fitting the ageing mode statistically to each series, the resulting sclerochronology displayed more low-frequency variability. Consistently, the added low-frequency variability evoked higher proxy–climate correlations. These results show the particular benefit of using the RCS method to develop sclerochronologies and preserve their low-frequency variations. Moreover, calculating the ageing curve and the final chronology by median, instead of mean, resulted in an amplified low-frequency climate signal. The results help to answer a growing need to better understand the behaviour of the sclerochronological data. In addition, we discuss the pitfalls that may potentially disrupt palaeoclimate signal detection in similar sclerochronological studies. Pitfalls may arise from shell taphonomy, water chemistry, time-variant characters of biological growth trends and small sample size.

Keywords

dendrochronologypalaeoclimatologypalaeolimnologysclerochronologytaphonomy
Type
Original Article
Information
Geological Magazine , Volume 146 , Issue 6 , November 2009 , pp. 917 - 930
Copyright
Copyright © Cambridge University Press 2009

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