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LIBRIS Formathandbok  (Information om MARC21)
FältnamnIndikatorerMetadata
00003570naa a2200517 4500
001oai:DiVA.org:uu-158165
003SwePub
008110901s2011 | |||||||||||000 ||eng|
0247 a https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-1581652 URI
0247 a https://doi.org/10.1016/j.cub.2011.05.0582 DOI
040 a (SwePub)uu
041 a engb eng
042 9 SwePub
072 7a ref2 swepub-contenttype
072 7a art2 swepub-publicationtype
1001 a Edwards, Ceiridwen J.4 aut
2451 0a Ancient Hybridization and an Irish Origin for the Modern Polar Bear Matriline
264 1b Elsevier BV,c 2011
338 a print2 rdacarrier
520 a 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.
650 7a NATURVETENSKAPx Biologi0 (SwePub)1062 hsv//swe
650 7a NATURAL SCIENCESx Biological Sciences0 (SwePub)1062 hsv//eng
653 a Biology
653 a Biologi
7001 a Suchard, Marc A.4 aut
7001 a Lemey, Philippe4 aut
7001 a Welch, John J.4 aut
7001 a Barnes, Ian4 aut
7001 a Fulton, Tara L.4 aut
7001 a Barnett, Ross4 aut
7001 a O'Connell, Tamsin C.4 aut
7001 a Coxon, Peter4 aut
7001 a Monaghan, Nigel4 aut
7001 a Valdiosera, Cristina E.4 aut
7001 a Lorenzen, Eline D.4 aut
7001 a Willerslev, Eske4 aut
7001 a Baryshnikov, Gennady F.4 aut
7001 a Rambaut, Andrew4 aut
7001 a Thomas, Mark G.u Uppsala universitet,Evolutionsbiologi4 aut0 (Swepub:uu)marth133
7001 a Bradley, Daniel G.4 aut
7001 a Shapiro, Beth4 aut
7102 a Uppsala universitetb Evolutionsbiologi4 org
7730 t Current Biologyd : Elsevier BVg 21:15, s. 1251-1258q 21:15<1251-1258x 0960-9822x 1879-0445
8564 u http://www.cell.com/article/S0960982211006452/pdf
8564 8u https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-158165
8564 8u https://doi.org/10.1016/j.cub.2011.05.058

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