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Biogeographic problem-solving reveals the Late Pleistocene translocation of a short-faced bear to the California Channel Islands

Authors
  • Mychajliw, Alexis M.1, 1, 2
  • Rick, Torben C.3
  • Dagtas, Nihan D.1, 1
  • Erlandson, Jon M.4, 4
  • Culleton, Brendan J.5
  • Kennett, Douglas J.6
  • Buckley, Michael7
  • Hofman, Courtney A.1, 1, 3
  • 1 University of Oklahoma, Norman, OK, USA , Norman (United States)
  • 2 La Brea Tar Pits and Museum, Los Angeles, CA, USA , Los Angeles (United States)
  • 3 National Museum of Natural History, Smithsonian Institution, Washington, DC, USA , Washington (United States)
  • 4 University of Oregon, Eugene, OR, USA , Eugene (United States)
  • 5 The Pennsylvania State University, University Park, PA, USA , University Park (United States)
  • 6 University of California, Santa Barbara, CA, USA , Santa Barbara (United States)
  • 7 University of Manchester, Manchester, M1 7DN, UK , Manchester (United Kingdom)
Type
Published Article
Journal
Scientific Reports
Publisher
Springer Nature
Publication Date
Sep 16, 2020
Volume
10
Issue
1
Identifiers
DOI: 10.1038/s41598-020-71572-z
Source
Springer Nature
License
Green

Abstract

An accurate understanding of biodiversity of the past is critical for contextualizing biodiversity patterns and trends in the present. Emerging techniques are refining our ability to decipher otherwise cryptic human-mediated species translocations across the Quaternary, yet these techniques are often used in isolation, rather than part of an interdisciplinary hypothesis-testing toolkit, limiting their scope and application. Here we illustrate the use of such an integrative approach and report the occurrence of North America’s largest terrestrial mammalian carnivore, the short-faced bear, Arctodus simus, from Daisy Cave (CA-SMI-261), an important early human occupation site on the California Channel Islands. We identified the specimen by corroborating morphological, protein, and mitogenomic lines of evidence, and evaluated the potential natural and anthropogenic mechanisms of its transport and deposition. While representing just a single specimen, our combination of techniques opened a window into the behavior of an enigmatic species, suggesting that A. simus was a wide-ranging scavenger utilizing terrestrial and marine carcasses. This discovery highlights the utility of bridging archaeological and paleontological datasets to disentangle complex biogeographic scenarios and reveal unexpected biodiversity for island systems worldwide.

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