Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/99917
Citations
Scopus Web of Science® Altmetric
?
?
Type: Journal article
Title: Ancient mitochondrial DNA reveals convergent evolution of giant short-faced bears (Tremarctinae) in North and South America
Author: Mitchell, K.
Bray, S.
Bover, P.
Soibelzon, L.
Schubert, B.
Prevosti, F.
Prieto, A.
Martin, F.
Austin, J.
Cooper, A.
Citation: Biology letters, 2016; 12(4):20160062-1-20160062-4
Publisher: The Royal Society
Issue Date: 2016
ISSN: 1744-9561
1744-957X
Statement of
Responsibility: 
Kieren J. Mitchell, Sarah C. Bray, Pere Bover, Leopoldo Soibelzon, Blaine W. Schubert, Francisco Prevosti, Alfredo Prieto, Fabiana Martin, Jeremy J. Austin, and Alan Cooper
Abstract: The Tremarctinae are a subfamily of bears endemic to the New World, including two of the largest terrestrial mammalian carnivores that have ever lived: the giant, short-faced bears Arctodus simus from North America and Arctotherium angustidens from South America (greater than or equal to 1000 kg).Arctotherium angustidens became extinct during the Early Pleistocene, whereas Arctodus simus went extinct at the very end of the Pleistocene. The only living tremarctine is the spectacled bear (Tremarctos ornatus), a largely herbivorous bear that is today only found in South America. The relationships among the spectacled bears (Tremarctos), South American short-faced bears (Arctotherium) and North American short-faced bears (Arctodus) remain uncertain. In this study, we sequenced a mitochondrial genome from an Arctotherium femur preserved in a Chilean cave. Our molecular phylogenetic analyses revealed that the South American short-faced bears were more closely related to the extant South American spectacled bear than to the North American short-faced bears. This result suggests striking convergent evolution of giant forms in the two groups of short-faced bears (Arctodus and Arctotherium), potentially as an adaptation to dominate competition for megafaunal carcasses.
Keywords: Ursidae; great American biotic interchange; molecular dating; palaeontology
Rights: © 2016 The Author(s) Published by the Royal Society. All rights reserved.
RMID: 0030046778
DOI: 10.1098/rsbl.2016.0062
Appears in Collections:Earth and Environmental Sciences publications

Files in This Item:
There are no files associated with this item.


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.