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Environmental Influences on Dietary Carbon and 14C Ages in Modern Rats and Other Species

Published online by Cambridge University Press:  18 July 2016

Nancy R Beavan-Athfield*
Affiliation:
Rafter Radiocarbon Laboratory, Institute of Geological and Nuclear Sciences, Box 31–312, Lower Hutt, New Zealand
Bruce G McFadgen
Affiliation:
New Zealand Department of Conservation, Science and Research Unit, PO Box 10420, Wellington, New Zealand
Rodger J Sparks
Affiliation:
Rafter Radiocarbon Laboratory, Institute of Geological and Nuclear Sciences, Box 31–312, Lower Hutt, New Zealand
*
Corresponding author. Email: [email protected].
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Abstract

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Diet can play a significant role in anomalous radiocarbon ages derived from bone and other tissues when the food web incorporates depleted 14C reservoirs, such as the marine environment. Dietary effects from a post-bomb carbon variation have also been found in modern invertebrates and populations of Rattus exulans (Beavan and Sparks 1998). We now present the effect on absolute percent modern (pMC) and the conventional radiocarbon age (CRA) of a modern aquatic/terrestrial food web in a volcanic zone of the North Island, New Zealand. At Lake Taupo, geothermal venting transfers 14C depleted carbon to lake waters, which aquatic plants fix into the food chain; depleted 14C is shown to then pass on to shellfish, waterfowl, and Norway rat (Rattus norvegicus). The geothermally induced 14C variations from modern atmospheric pMC and CRA can increase apparent 14C ages by >2000 years.

Type
Articles
Copyright
Copyright © The Arizona Board of Regents on behalf of the University of Arizona 

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