Surprising migration and population size dynamics in ancient Iberian brown bears (Ursus arctos)
The endangered brown bear populations (Ursus arctos) in Iberia have been suggested to be the last fragments of the brown bear population that served as recolonization stock for large parts of Europe during the Pleistocene. Conservation efforts are intense, and results are closely monitored. However,...
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NATL ACAD SCIENCES
2008
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ftucl:oai:eprints.ucl.ac.uk.OAI2:135201 2023-05-15T18:41:53+02:00 Surprising migration and population size dynamics in ancient Iberian brown bears (Ursus arctos) Valdiosera, CE Garcia-Garitagoitia, JL Garcia, N Doadrio, I Thomas, MG Hanni, C Arsuaga, JL Barnes, I Hofreiter, M Orlando, L Gotherstorm, A 2008-04-01 http://discovery.ucl.ac.uk/135201/ unknown NATL ACAD SCIENCES P NATL ACAD SCI USA , 105 (13) 5123 - 5128. (2008) bottleneck gene flow mitochondrial DNA ancient DNA serial coalescent simulations MITOCHONDRIAL-DNA CONSERVATION GENETICS MAXIMUM-LIKELIHOOD PHYLOGEOGRAPHY EUROPE TIME EXTRACTION INFERENCE SPELAEUS MODEL Article 2008 ftucl 2016-01-15T03:17:23Z The endangered brown bear populations (Ursus arctos) in Iberia have been suggested to be the last fragments of the brown bear population that served as recolonization stock for large parts of Europe during the Pleistocene. Conservation efforts are intense, and results are closely monitored. However, the efforts are based on the assumption that the Iberian bears are a unique unit that has evolved locally for an extended period. We have sequenced mitochondrial DNA (mtDNA) from ancient Iberian bear remains and analyzed them as a serial clataset, monitoring changes in diversity and occurrence of European haplogroups over time. Using these data, we show that the Iberian bear population has experienced a dynamic, recent evolutionary history. Not only has the population undergone mitochondrial gene flow from other European brown bears, but the effective population size also has fluctuated substantially. We conclude that the Iberian bear population has been a fluid evolutionary unit, developed by gene flow from other populations and population bottlenecks, far from being in genetic equilibrium or isolated from other brown bear populations. Thus, the current situation is highly unusual and the population may in fact be isolated for the first time in its history. Article in Journal/Newspaper Ursus arctos University College London: UCL Discovery |
institution |
Open Polar |
collection |
University College London: UCL Discovery |
op_collection_id |
ftucl |
language |
unknown |
topic |
bottleneck gene flow mitochondrial DNA ancient DNA serial coalescent simulations MITOCHONDRIAL-DNA CONSERVATION GENETICS MAXIMUM-LIKELIHOOD PHYLOGEOGRAPHY EUROPE TIME EXTRACTION INFERENCE SPELAEUS MODEL |
spellingShingle |
bottleneck gene flow mitochondrial DNA ancient DNA serial coalescent simulations MITOCHONDRIAL-DNA CONSERVATION GENETICS MAXIMUM-LIKELIHOOD PHYLOGEOGRAPHY EUROPE TIME EXTRACTION INFERENCE SPELAEUS MODEL Valdiosera, CE Garcia-Garitagoitia, JL Garcia, N Doadrio, I Thomas, MG Hanni, C Arsuaga, JL Barnes, I Hofreiter, M Orlando, L Gotherstorm, A Surprising migration and population size dynamics in ancient Iberian brown bears (Ursus arctos) |
topic_facet |
bottleneck gene flow mitochondrial DNA ancient DNA serial coalescent simulations MITOCHONDRIAL-DNA CONSERVATION GENETICS MAXIMUM-LIKELIHOOD PHYLOGEOGRAPHY EUROPE TIME EXTRACTION INFERENCE SPELAEUS MODEL |
description |
The endangered brown bear populations (Ursus arctos) in Iberia have been suggested to be the last fragments of the brown bear population that served as recolonization stock for large parts of Europe during the Pleistocene. Conservation efforts are intense, and results are closely monitored. However, the efforts are based on the assumption that the Iberian bears are a unique unit that has evolved locally for an extended period. We have sequenced mitochondrial DNA (mtDNA) from ancient Iberian bear remains and analyzed them as a serial clataset, monitoring changes in diversity and occurrence of European haplogroups over time. Using these data, we show that the Iberian bear population has experienced a dynamic, recent evolutionary history. Not only has the population undergone mitochondrial gene flow from other European brown bears, but the effective population size also has fluctuated substantially. We conclude that the Iberian bear population has been a fluid evolutionary unit, developed by gene flow from other populations and population bottlenecks, far from being in genetic equilibrium or isolated from other brown bear populations. Thus, the current situation is highly unusual and the population may in fact be isolated for the first time in its history. |
format |
Article in Journal/Newspaper |
author |
Valdiosera, CE Garcia-Garitagoitia, JL Garcia, N Doadrio, I Thomas, MG Hanni, C Arsuaga, JL Barnes, I Hofreiter, M Orlando, L Gotherstorm, A |
author_facet |
Valdiosera, CE Garcia-Garitagoitia, JL Garcia, N Doadrio, I Thomas, MG Hanni, C Arsuaga, JL Barnes, I Hofreiter, M Orlando, L Gotherstorm, A |
author_sort |
Valdiosera, CE |
title |
Surprising migration and population size dynamics in ancient Iberian brown bears (Ursus arctos) |
title_short |
Surprising migration and population size dynamics in ancient Iberian brown bears (Ursus arctos) |
title_full |
Surprising migration and population size dynamics in ancient Iberian brown bears (Ursus arctos) |
title_fullStr |
Surprising migration and population size dynamics in ancient Iberian brown bears (Ursus arctos) |
title_full_unstemmed |
Surprising migration and population size dynamics in ancient Iberian brown bears (Ursus arctos) |
title_sort |
surprising migration and population size dynamics in ancient iberian brown bears (ursus arctos) |
publisher |
NATL ACAD SCIENCES |
publishDate |
2008 |
url |
http://discovery.ucl.ac.uk/135201/ |
genre |
Ursus arctos |
genre_facet |
Ursus arctos |
op_source |
P NATL ACAD SCI USA , 105 (13) 5123 - 5128. (2008) |
_version_ |
1766231447735107584 |