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Research Article

Dating the late prehistoric dispersal of Polynesians to New Zealand using the commensal Pacific rat

Janet M. Wilmshurst, Atholl J. Anderson, Thomas F. G. Higham, and Trevor H. Worthy
  1. *Landcare Research, P.O. Box 40, Lincoln 7640, New Zealand;
  2. ‡Department of Archaeology and Natural History, Research School of Pacific and Asian Studies, Australian National University, Canberra ACT 0200, Australia;
  3. §Oxford Radiocarbon Accelerator Unit, Research Laboratory for Archaeology and the History of Art, Dyson Perrins Building, South Parks Road, University of Oxford, Oxford OX1 3QY, United Kingdom; and
  4. ¶School of Earth and Environmental Sciences, University of Adelaide, South Australia 5005, Australia

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PNAS June 3, 2008 105 (22) 7676-7680; https://doi.org/10.1073/pnas.0801507105
Janet M. Wilmshurst
*Landcare Research, P.O. Box 40, Lincoln 7640, New Zealand;
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  • For correspondence: wilmshurstj@landcareresearch.co.nz
Atholl J. Anderson
‡Department of Archaeology and Natural History, Research School of Pacific and Asian Studies, Australian National University, Canberra ACT 0200, Australia;
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Thomas F. G. Higham
§Oxford Radiocarbon Accelerator Unit, Research Laboratory for Archaeology and the History of Art, Dyson Perrins Building, South Parks Road, University of Oxford, Oxford OX1 3QY, United Kingdom; and
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Trevor H. Worthy
¶School of Earth and Environmental Sciences, University of Adelaide, South Australia 5005, Australia
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  1. Edited by Patrick V. Kirch, University of California, Berkeley, CA, and approved April 7, 2008 (received for review February 14, 2008)

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    Fig. 1.

    Calibrated age ranges of rat bone dates from New Zealand. New calibrated age ranges of AMS dates on R. exulans from Earthquakes #1, Predator Cave, and seven other South Island laughing owl sites from which the original 1995–1996 rat bone dates were derived (20, 21). Blue circles, our reexcavations; red circles, museum collections (see Table S1 for stratigraphic and other details). R. exulans ages from previous studies (20, 21) also shown in their laboratory processing order (1995–1996 and 1997–1998) (40): open diamonds, archaeological sites (36); black diamonds, laughing owl sites (21), showing unusual bimodal distribution (36). Symbols, median age; bars, upper and lower limits of 2σ age range. Vertical dashed lines, 1σ age range of oldest archaeological site in New Zealand (1280–1382 A.D.) (25).

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    Fig. 2.

    Locations of laughing owl bone sites, seed deposits, and seed test pits in New Zealand. Symbols show location of redated laughing owl bone sites (20, 21) (blue), seed deposits (red) mentioned in text, and test pits (black) examined during the search for seed sites, but which did not contain preserved seeds.

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    Fig. 3.

    Calibrated age ranges of seeds, earliest archaeological evidence, and our oldest rat bones from New Zealand. Horizontal bars represent 1σ calibrated age ranges for seeds (from the oldest to the youngest seed dates) at South Island (this study) and North Island sites (22), including sites with rat-gnawed seeds present and sites with only intact or bird-cracked seeds present. Red circle is the pooled mean age of oldest rat-gnawed seeds from three sites (1σ range with median). Vertical dashed lines represent the 1σ calibrated age range of the oldest archaeological evidence from New Zealand (1280–1382 A.D.) (25). Vertical red bar is the 1σ calibrated age range of our oldest rat bone (OxA 14472), and n, number of dates within each range limit (see Table S2 for details). (Inset) Typical rat-gnawed endocarp (Elaeocarpus dentatus) showing distinctive incisor bite marks (length 8 mm).

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Dating the late prehistoric dispersal of Polynesians to New Zealand using the commensal Pacific rat
Janet M. Wilmshurst, Atholl J. Anderson, Thomas F. G. Higham, Trevor H. Worthy
Proceedings of the National Academy of Sciences Jun 2008, 105 (22) 7676-7680; DOI: 10.1073/pnas.0801507105

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Dating the late prehistoric dispersal of Polynesians to New Zealand using the commensal Pacific rat
Janet M. Wilmshurst, Atholl J. Anderson, Thomas F. G. Higham, Trevor H. Worthy
Proceedings of the National Academy of Sciences Jun 2008, 105 (22) 7676-7680; DOI: 10.1073/pnas.0801507105
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Proceedings of the National Academy of Sciences: 105 (22)
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