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Ancient hybridization and an Irish origin for the modern polar bear matriline.
MedLine Citation:
PMID:  21737280     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
BACKGROUND: Polar bears (Ursus maritimus) are among those species most susceptible to the rapidly changing arctic climate, and their survival is of global concern. Despite this, little is known about polar bear species history. Future conservation strategies would significantly benefit from an understanding of basic evolutionary information, such as the timing and conditions of their initial divergence from brown bears (U. arctos) or their response to previous environmental change.
RESULTS: We used a spatially explicit phylogeographic model to estimate the dynamics of 242 brown bear and polar bear matrilines sampled throughout the last 120,000 years and across their present and past geographic ranges. Our results show that the present distribution of these matrilines was shaped by a combination of regional stability and rapid, long-distance dispersal from ice-age refugia. In addition, hybridization between polar bears and brown bears may have occurred multiple times throughout the Late Pleistocene.
CONCLUSIONS: The reconstructed matrilineal history of brown and polar bears has two striking features. First, it is punctuated by dramatic and discrete climate-driven dispersal events. Second, opportunistic mating between these two species as their ranges overlapped has left a strong genetic imprint. In particular, a likely genetic exchange with extinct Irish brown bears forms the origin of the modern polar bear matriline. This suggests that interspecific hybridization not only may be more common than previously considered but may be a mechanism by which species deal with marginal habitats during periods of environmental deterioration.
Authors:
Ceiridwen J Edwards; Marc A Suchard; Philippe Lemey; John J Welch; Ian Barnes; Tara L Fulton; Ross Barnett; Tamsin C O'Connell; Peter Coxon; Nigel Monaghan; Cristina E Valdiosera; Eline D Lorenzen; Eske Willerslev; Gennady F Baryshnikov; Andrew Rambaut; Mark G Thomas; Daniel G Bradley; Beth Shapiro
Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2011-07-07
Journal Detail:
Title:  Current biology : CB     Volume:  21     ISSN:  1879-0445     ISO Abbreviation:  Curr. Biol.     Publication Date:  2011 Aug 
Date Detail:
Created Date:  2011-08-08     Completed Date:  2011-12-21     Revised Date:  2014-02-20    
Medline Journal Info:
Nlm Unique ID:  9107782     Medline TA:  Curr Biol     Country:  England    
Other Details:
Languages:  eng     Pagination:  1251-8     Citation Subset:  IM    
Copyright Information:
Copyright © 2011 Elsevier Ltd. All rights reserved.
Data Bank Information
Bank Name/Acc. No.:
GENBANK/JF900098;  JF900099;  JF900100;  JF900101;  JF900102;  JF900103;  JF900104;  JF900105;  JF900106;  JF900107;  JF900108;  JF900109;  JF900110;  JF900111;  JF900112;  JF900113;  JF900114;  JF900115;  JF900116;  JF900117;  JF900118;  JF900119;  JF900120;  JF900121;  JF900122;  JF900123;  JF900124;  JF900125;  JF900126;  JF900127;  JF900128;  JF900129;  JF900130;  JF900131;  JF900132;  JF900133;  JF900134;  JF900135;  JF900136;  JF900137;  JF900138;  JF900139;  JF900140;  JF900141;  JF900142;  JF900143;  JF900144;  JF900145;  JF900146;  JF900147;  JF900148;  JF900149;  JF900150;  JF900151;  JF900152;  JF900153;  JF900154;  JF900155;  JF900156;  JF900157;  JF900158;  JF900159;  JF900160;  JF900161;  JF900162;  JF900163;  JF900164;  JF900165;  JF900166;  JF900167;  JF900168;  JF900169;  JF900170;  JF900171;  JF900172;  JF900173;  JF900174;  JF900175
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MeSH Terms
Descriptor/Qualifier:
Animals
Molecular Sequence Data
Nucleic Acid Hybridization*
Phylogeny
Ursidae*
Grant Support
ID/Acronym/Agency:
260864//European Research Council; R01 GM083603-01/GM/NIGMS NIH HHS; R01 GM086887/GM/NIGMS NIH HHS

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