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Controls, variation, and a record of climate change in detailed stable isotope record in a single bryozoan skeleton☆

Published online by Cambridge University Press:  20 January 2017

Abigail M. Smith  and
Marcus M. Key Jr.
Abigail M. Smith*
Affiliation:
Department of Marine Science, University of Otago, P. O. Box 56, Dunedin, New Zealand
Marcus M. Key Jr.
Affiliation:
Department of Geology, Dickinson College, Carlisle, PA 17013-2896, USA
*
*Corresponding author. Fax: +1-64-3-479-8336.E-mail address:[email protected] (A.M. Smith).
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Abstract

The long-lived (about 20 yr) bryozoan Adeonellopsis sp. from Doubtful Sound, New Zealand, precipitates aragonite in isotopic equilibrium with seawater, exerting no metabolic or kinetic effects. Oxygen isotope ratios (δ18O) in 61 subsamples (along three branches of a single unaltered colony) range from −0.09 to +0.68‰ PDB (mean = +0.36‰ PDB). Carbon isotope ratios (δ13C) range from +0.84 to +2.18‰ PDB (mean = +1.69‰ PDB). Typical of cool-water carbonates, δ18O-derived water temperatures range from 14.2 to 17.5 °C. Adeonellopsis has a minimum temperature growth threshold of 14 °C, recording only a partial record of environmental variation. By correlating seawater temperatures derived from δ18O with the Southern Oscillation Index, however, we were able to detect major events such as the 1983 El Niño. Interannual climatic variation can be recorded in skeletal carbonate isotopes. The range of within-colony isotopic variability found in this study (0.77‰ in δ18O and 1.34 in δ13C) means that among-colony variation must be treated cautiously. Temperate bryozoan isotopes have been tested in less than 2% of described extant species — this highly variable phylum is not yet fully understood.

Keywords

BryozoaStable isotopesδ18Oδ13CClimateENSONew Zealand
Type
Research Article
Information
Quaternary Research , Volume 61 , Issue 2 , March 2004 , pp. 123 - 133
Copyright
University of Washington

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Footnotes

☆

Supplementary data for this article (Appendix) are available on Science Direct (http://www.sciencedirect.com).

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