Interspecific and intraspecific mitochondrial DNA variation in North American bears ( Ursus)
We assessed mitochondrial DNA variation in North American black bears (Ursus americanus), brown bears (Ursus arctos), and polar bears (Ursus maritimus). Divergent mitochondrial DNA haplotypes (0.05 base substitutions per nucleotide) were identified in populations of black bears from Montana and Oreg...
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Canadian Science Publishing
1991
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Online Access: | http://dx.doi.org/10.1139/z91-421 http://www.nrcresearchpress.com/doi/pdf/10.1139/z91-421 |
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crcansciencepubl:10.1139/z91-421 2024-09-09T20:12:50+00:00 Interspecific and intraspecific mitochondrial DNA variation in North American bears ( Ursus) Cronin, Matthew A. Amstrup, Steven C. Garner, Gerald W. Vyse, Ernest R. 1991 http://dx.doi.org/10.1139/z91-421 http://www.nrcresearchpress.com/doi/pdf/10.1139/z91-421 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Zoology volume 69, issue 12, page 2985-2992 ISSN 0008-4301 1480-3283 journal-article 1991 crcansciencepubl https://doi.org/10.1139/z91-421 2024-08-08T04:13:39Z We assessed mitochondrial DNA variation in North American black bears (Ursus americanus), brown bears (Ursus arctos), and polar bears (Ursus maritimus). Divergent mitochondrial DNA haplotypes (0.05 base substitutions per nucleotide) were identified in populations of black bears from Montana and Oregon. In contrast, very similar haplotypes occur in black bears across North America. This discordance of haplotype phylogeny and geographic distribution indicates that there has been maintenance of polymorphism and considerable gene flow throughout the history of the species. Intraspecific mitochondrial DNA sequence divergence in brown bears and polar bears is lower than in black bears. The two morphological forms of U. arctos, grizzly and coastal brown bears, are not in distinct mtDNA lineages. Interspecific comparisons indicate that brown bears and polar bears share similar mitochondrial DNA (0.023 base substitutions per nucleotide) which is quite divergent (0.078 base substitutions per nucleotide) from that of black bears. High mitochondrial DNA divergence within black bears and paraphyletic relationships of brown and polar bear mitochondrial DNA indicate that intraspecific variation across species' ranges should be considered in phylogenetic analyses of mitochondrial DNA. Article in Journal/Newspaper Ursus arctos Ursus maritimus Canadian Science Publishing Canadian Journal of Zoology 69 12 2985 2992 |
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Open Polar |
collection |
Canadian Science Publishing |
op_collection_id |
crcansciencepubl |
language |
English |
description |
We assessed mitochondrial DNA variation in North American black bears (Ursus americanus), brown bears (Ursus arctos), and polar bears (Ursus maritimus). Divergent mitochondrial DNA haplotypes (0.05 base substitutions per nucleotide) were identified in populations of black bears from Montana and Oregon. In contrast, very similar haplotypes occur in black bears across North America. This discordance of haplotype phylogeny and geographic distribution indicates that there has been maintenance of polymorphism and considerable gene flow throughout the history of the species. Intraspecific mitochondrial DNA sequence divergence in brown bears and polar bears is lower than in black bears. The two morphological forms of U. arctos, grizzly and coastal brown bears, are not in distinct mtDNA lineages. Interspecific comparisons indicate that brown bears and polar bears share similar mitochondrial DNA (0.023 base substitutions per nucleotide) which is quite divergent (0.078 base substitutions per nucleotide) from that of black bears. High mitochondrial DNA divergence within black bears and paraphyletic relationships of brown and polar bear mitochondrial DNA indicate that intraspecific variation across species' ranges should be considered in phylogenetic analyses of mitochondrial DNA. |
format |
Article in Journal/Newspaper |
author |
Cronin, Matthew A. Amstrup, Steven C. Garner, Gerald W. Vyse, Ernest R. |
spellingShingle |
Cronin, Matthew A. Amstrup, Steven C. Garner, Gerald W. Vyse, Ernest R. Interspecific and intraspecific mitochondrial DNA variation in North American bears ( Ursus) |
author_facet |
Cronin, Matthew A. Amstrup, Steven C. Garner, Gerald W. Vyse, Ernest R. |
author_sort |
Cronin, Matthew A. |
title |
Interspecific and intraspecific mitochondrial DNA variation in North American bears ( Ursus) |
title_short |
Interspecific and intraspecific mitochondrial DNA variation in North American bears ( Ursus) |
title_full |
Interspecific and intraspecific mitochondrial DNA variation in North American bears ( Ursus) |
title_fullStr |
Interspecific and intraspecific mitochondrial DNA variation in North American bears ( Ursus) |
title_full_unstemmed |
Interspecific and intraspecific mitochondrial DNA variation in North American bears ( Ursus) |
title_sort |
interspecific and intraspecific mitochondrial dna variation in north american bears ( ursus) |
publisher |
Canadian Science Publishing |
publishDate |
1991 |
url |
http://dx.doi.org/10.1139/z91-421 http://www.nrcresearchpress.com/doi/pdf/10.1139/z91-421 |
genre |
Ursus arctos Ursus maritimus |
genre_facet |
Ursus arctos Ursus maritimus |
op_source |
Canadian Journal of Zoology volume 69, issue 12, page 2985-2992 ISSN 0008-4301 1480-3283 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/z91-421 |
container_title |
Canadian Journal of Zoology |
container_volume |
69 |
container_issue |
12 |
container_start_page |
2985 |
op_container_end_page |
2992 |
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1809947442060197888 |