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Factors Influencing 14C Ages of the Pacific Rat Rattus Exulans

Published online by Cambridge University Press:  18 July 2016

Nancy Ragano Beavan  and
Rodger J. Sparks
Nancy Ragano Beavan
Affiliation:
Rafter Radiocarbon Laboratory, Institute of Geological and Nuclear Sciences, P.O. Box 31312 Lower Hutt, New Zealand
Rodger J. Sparks
Affiliation:
Rafter Radiocarbon Laboratory, Institute of Geological and Nuclear Sciences, P.O. Box 31312 Lower Hutt, New Zealand
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Abstract

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An isotopic database for the Pacific/Polynesian rat (Rattus exulans) and foods that it scavenges is used to examine diet-induced 14C age variation in omnivores. We discuss a suite of 26 δ14C determinations and 13C and 15N analysis for modern Pacific/Polynesian rat bone gelatin and available food items from Kapiti Island, New Zealand (40°51'S, 174°75'E). These analyses provide the first isotopic data for modern specimens of the species, collected as part of a larger project to determine potential sources of bias in unexpectedly old 14C age measurements on subfossil specimens of R. exulans from New Zealand. Stable C, N and 14C isotopic and trapping data are used to trace carbon intake via the diet of the rats in each habitat. Data from specimens linked to five specific habitats on the island indicate that modern populations of R. exulans are not in equilibrium with atmospheric values of δ14C, being either enriched or depleted relative to the atmospheric curve in 1996/97, the period of collection. The δ14C values recorded for R. exulans are associated with diet, and result from variation in δ14C values found in animal-protein food items available to a scavenging omnivore. The titer of carbon deviating from atmospheric values is believed to be derived from the essential amino acids in the protein-rich foods of the rat diet.

Present evidence suggests that the depletion required to affect 14C ages limits the possibility that diet introduces dramatic offsets from true ages. Marine diets, for example, would have a variable effect on ages for terrestrial omnivores, contraindicating the application of a standard marine correction for such specimens. We suggest that to identify the extent to which diet may influence the 14C age in a given specimen of terrestrial omnivore, the separation and dating of essential amino acids vs. a nonessential amino, such as glycine, be applied.

Type
Part 2: Applications
Information
Radiocarbon , Volume 40 , Issue 2: 16th International Radiocarbon Conference June 16-20, 1997 Part 2: Applications, Conference Editors: Willem G. Mook Johannes van der Plicht , 1997 , pp. 601 - 613
Copyright
Copyright © The American Journal of Science 

References

Ambrose, S. H. and Norr, L. 1993 Experimental evidence for the relationship of the carbon isotope ratios of whole diet and dietary protein to those of bone collagen and carbonate. In Mabert, J. B. and Grape, G., eds., Prehistoric Human Bone: Archaeology at the Molecular Level Berlin, Springer-Verlag: 1–38.Google Scholar
Anderson, A., Allingham, B. and Higham, T. 1996 Radiocarbon chronology. In Anderson, A., Allingham, B. and Smith, I., eds., Shag River Mouth: The Archaeology of an Early Southern Maori Village. Canberra, ANH Publications, The Australian National University: 294 p.Google Scholar
Booth, A. M., Minot, E. O., Fordham, R. A. and Innes, J. G. 1996 Kiore (Rattus exulans) predation on the eggs of the Little Shearwater (Puffinus assimilis baurakiensis). Notornis 43: 147–153.Google Scholar
Bulmer, S. 1989 Gardens in the South: Diversity and change in prehistoric Maori agriculture. In Harris, D. R. and Hillman, G. C. eds., Foraging and Farming: The Evolution of Plant Exploitation. London, Unwin Hyman: 688–705.Google Scholar
Bunn, T. J. and Craig, J. L. 1989 Population cycles of Rattus exulans: Population changes, diet, and food availability. New Zealand Journal of Zoology 16: 409–418.Google Scholar
Chisholm, B. S., Nelson, D. E. and Schwartz, H. P. 1982 Stable-carbon isotope ratios as a measure of marine vs. terrestrial protein in ancient diets. Science 216: 1131–1132.Google Scholar
Chisholm, B. S., Nelson, D. E., Hobson, K. A., Schwartz, H. P. and Knyf, M. 1983 Carbon isotope measurement techniques for bone collagen: Notes for the archaeologist. Journal of Archaeological Sciences 10: 355–360.CrossRefGoogle Scholar
Davidson, J. M. 1984 The Prehistory of New Zealand. Auckland, Longman Paul: 270 p.Google Scholar
DeNiro, M. J. 1987 Stable isotopy and archaeology. American Scientist 75: 182–191.Google Scholar
Druffel, E. R. M. and Griffin, S. 1995 Radiocarbon in tropospheric CO2 and organic materials from selected Northern Hemisphere sites. Radiocarbon 37(3): 883–888.Google Scholar
Elliot, M. B., Striewski, B., Flenley, J. R. and Sutton, D. G. 1995 Palynological and sedimentological evidence for a radiocarbon chronology of environmental change and Polynesian deforestation from Lake Taumatawhana, Northland, New Zealand. Radiocarbon 37(3): 899–916.Google Scholar
Fuller, S. A. 1994 Biological indexing on Kapiti Island, a preliminary assessment, March – June 1994. Wellington Conservancy, Department of Conservation, Wellington, New Zealand.Google Scholar
Groube, L. M. 1968 Research in New Zealand since 1956. In Yawata, I. and Sinoto, Y. H., eds., Prehistoric Culture in Oceania: A Symposium. Honolulu, Bishop Museum Press: 141–149.Google Scholar
Hare, P. E. and Estep, M. L. F. 1983 Carbon and nitrogen isotopic composition of amino acids in modern and fossil collagens. Annual Report of the Director, Geophysical Laboratory, Carnegie Institution of Washington , 1981–1982: 410–414.Google Scholar
Holdaway, R. N. 1996 Arrival of rats in New Zealand. Nature 384: 225–226.Google Scholar
Imber, M. J. 1984 Exploitation by rats of eggs neglected by Gadfly Petrels. Cormorant 12: 82–93.Google Scholar
Kirch, P. V. 1986 Re-thinking East Polynesian prehistory. Journal of Polynesian Society 95: 9–40.Google Scholar
Krueger, H. W. and Sullivan, C. H. 1984 Models for carbon isotope fractionation between diet and bone. In Turnland, J. R. and Johnson, P. E., eds., Stable Isotopes in Nutrition. ACS Symposium Series 258. Washington, D.C., American Chemical Society: 205–220.Google Scholar
Long, A., Hendershott, R. B. and Martin, P. S. 1983. Radiocarbon dating of fossil eggshell. In Stuiver, M. and Kra, R. S., eds., Proceedings of the 11th International 14C Conference. Radiocarbon 25(2): 533–539.Google Scholar
Lovegrove, T. G. 1996. A comparison of the effects of predation by Norway (Rattus norvegicus) and Polynesian rats (R. exulans) on the Saddleback (Philesturnus carunculatus) . Notornis 43: 91–112.Google Scholar
Macko, S. A., Estep, M. L. F., Hare, P. E. and Hoering, T. C. 1983 Stable nitrogen and carbon isotopic composition of individual amino acids isolated from cultured microorganisms. Annual Report of the Director, Geophysical Laboratory, Carnegie Institution of Washington , 1981–1982: 404–410.Google Scholar
McGlone, M. S., Mark, A. F. and Bell, D. 1995 Late Pleistocene and Holocene vegetation history, Central Otago, South Island, New Zealand. Journal of the Royal Society of New Zealand 25(1): 1–22.Google Scholar
Mildenhall, D. C. 1979 Holocene pollen diagrams from Pauatahanui Inlet, Porirua, New Zealand. New Zealand Journal of Geology and Geophysics 22: 585–591.Google Scholar
Miskelly, C. (ms.) 1992 Kapiti Island Rat Index Lines. Internal document for Wellington Conservancy Region, Kapiti Island conservation program.Google Scholar
Negro, A., Garbisa, S., Gotte, L. and Spina, M. 1987 The use of reverse phase High Performance Liquid Chromatography and precolumn derivitization with dansyl chloride for quantitation of specific amino acids in collagen and elastin. Analytical Biochemistry 160: 39–46.Google Scholar
Nydal, R. 1963 Increase in radiocarbon from the most recent series of thermonuclear tests. Nature 200(4903): 212–214.CrossRefGoogle Scholar
O'Brien, B. J. and Stout, J. D. 1978 Movement and turnover of soil organic matter as indicated by carbon isotope measurements. Soil Biology and Biochemistry 10: 309–317.Google Scholar
Radin, N. S. 1981 Extraction of tissue lipids with a solvent of low toxicity. Methods in Enzymology 27: 5–7.Google Scholar
Riggs, A. C. 1984 Major carbon-14 deficiency in modern snail shells from southern Nevada springs. Science 224: 58–61.Google Scholar
Schoeninger, M. J. and DeNiro, M. J. 1984 Nitrogen and carbon isotopic composition of bone collagen from marine and terrestrial animals. Geochimica et Cosmochimica Acta 48: 625–639.Google Scholar
Schoeninger, M. J. and Moore, K. 1992 Bone stable isotope studies in archaeology. Journal of World Prehistory 6(2): 247–296.Google Scholar
Speed, H. (ms.) 1986 Demography and diet of Kiore (Rattus exulans) on Little Barrier Island. MSc. thesis, Department of Zoology, University of Auckland.Google Scholar
Steele, W. K. and Hockey, P. A. R. 1990 The human influence on Kelp Gull diet assessed using stable carbon isotope analysis of bone collagen. South African Journal of Science 87: 273–275.Google Scholar
Stuiver, M. and Polach, H. A. 1977 Discussion: Reporting of 14C data. Radiocarbon 19(3): 355–363.Google Scholar
Sutton, D. G. 1987 A paradigm shift in Polynesian prehistory: Implications for New Zealand. New Zealand Journal of Archaeology 9: 135–55.Google Scholar
Tauber, H. 1967 Copenhagen Radiocarbon Measurements VIII, Geographic variations in atmospheric C-14 activity. Radiocarbon 9: 246–256.Google Scholar
von Schirnding, Y., van der Merwe, N. J. and Vogel, J. C. 1982 The influence of diet and age on carbon isotope ratios in ostrich eggshell. Archaeometry 24(1): 3–20.Google Scholar
Williams, J. M. 1975 The ecology of Rattus exulans (Peale). Pacific Science 27(2): 120–127.Google Scholar