Genetic divergence between sympatric Arctic charr Salvelinus alpinus morphs in Gander Lake, Newfoundland: roles of migration, mutation and unequal effective population sizes
A suite of 10 microsatellite loci was used to examine genetic divergence between two sympatric morphs of Arctic charr Salvelinus alpinus (‘dark’ and ‘pale’) inhabiting Gander Lake, Newfoundland. Results can be summarized as follows: (1) the morphs are strongly reproductively isolated – gene flow–mig...
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crwiley:10.1111/j.1095-8649.2008.02048.x 2024-06-23T07:48:55+00:00 Genetic divergence between sympatric Arctic charr Salvelinus alpinus morphs in Gander Lake, Newfoundland: roles of migration, mutation and unequal effective population sizes Gomez‐Uchida, D. Dunphy, K. P. O’Connell, M. F. Ruzzante, D. E. 2008 http://dx.doi.org/10.1111/j.1095-8649.2008.02048.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1095-8649.2008.02048.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1095-8649.2008.02048.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Fish Biology volume 73, issue 8, page 2040-2057 ISSN 0022-1112 1095-8649 journal-article 2008 crwiley https://doi.org/10.1111/j.1095-8649.2008.02048.x 2024-06-11T04:45:17Z A suite of 10 microsatellite loci was used to examine genetic divergence between two sympatric morphs of Arctic charr Salvelinus alpinus (‘dark’ and ‘pale’) inhabiting Gander Lake, Newfoundland. Results can be summarized as follows: (1) the morphs are strongly reproductively isolated – gene flow–migration estimates were consistently low in long and short‐term evolutionary timescales of analysis; (2) intermorph divergence based on allele size ( R ST ) was significantly larger than those based on allele state ( θ ) implying a cumulative effect of stepwise‐like mutations; (3) historical (coalescent) and current (linkage disequilibrium) point estimates of effective population size ( N e ) were consistently higher for dark than for pale S. alpinus . The first and second findings lend support to the hypothesis that divergence between forms may have preceded the last glacial period (ending c. 12 000 years bp ). The third finding argues for significant differences in habitat quantity and quality between morphs, which were emphasized in a previous study. Overall, these analyses underscore the importance of genetic assessment and monitoring in the conservation of fish diversity, with emphasis on ‘rare’ or under‐represented forms among temperate species pairs. Article in Journal/Newspaper Arctic charr Arctic Newfoundland Salvelinus alpinus Wiley Online Library Arctic Journal of Fish Biology 73 8 2040 2057 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
A suite of 10 microsatellite loci was used to examine genetic divergence between two sympatric morphs of Arctic charr Salvelinus alpinus (‘dark’ and ‘pale’) inhabiting Gander Lake, Newfoundland. Results can be summarized as follows: (1) the morphs are strongly reproductively isolated – gene flow–migration estimates were consistently low in long and short‐term evolutionary timescales of analysis; (2) intermorph divergence based on allele size ( R ST ) was significantly larger than those based on allele state ( θ ) implying a cumulative effect of stepwise‐like mutations; (3) historical (coalescent) and current (linkage disequilibrium) point estimates of effective population size ( N e ) were consistently higher for dark than for pale S. alpinus . The first and second findings lend support to the hypothesis that divergence between forms may have preceded the last glacial period (ending c. 12 000 years bp ). The third finding argues for significant differences in habitat quantity and quality between morphs, which were emphasized in a previous study. Overall, these analyses underscore the importance of genetic assessment and monitoring in the conservation of fish diversity, with emphasis on ‘rare’ or under‐represented forms among temperate species pairs. |
format |
Article in Journal/Newspaper |
author |
Gomez‐Uchida, D. Dunphy, K. P. O’Connell, M. F. Ruzzante, D. E. |
spellingShingle |
Gomez‐Uchida, D. Dunphy, K. P. O’Connell, M. F. Ruzzante, D. E. Genetic divergence between sympatric Arctic charr Salvelinus alpinus morphs in Gander Lake, Newfoundland: roles of migration, mutation and unequal effective population sizes |
author_facet |
Gomez‐Uchida, D. Dunphy, K. P. O’Connell, M. F. Ruzzante, D. E. |
author_sort |
Gomez‐Uchida, D. |
title |
Genetic divergence between sympatric Arctic charr Salvelinus alpinus morphs in Gander Lake, Newfoundland: roles of migration, mutation and unequal effective population sizes |
title_short |
Genetic divergence between sympatric Arctic charr Salvelinus alpinus morphs in Gander Lake, Newfoundland: roles of migration, mutation and unequal effective population sizes |
title_full |
Genetic divergence between sympatric Arctic charr Salvelinus alpinus morphs in Gander Lake, Newfoundland: roles of migration, mutation and unequal effective population sizes |
title_fullStr |
Genetic divergence between sympatric Arctic charr Salvelinus alpinus morphs in Gander Lake, Newfoundland: roles of migration, mutation and unequal effective population sizes |
title_full_unstemmed |
Genetic divergence between sympatric Arctic charr Salvelinus alpinus morphs in Gander Lake, Newfoundland: roles of migration, mutation and unequal effective population sizes |
title_sort |
genetic divergence between sympatric arctic charr salvelinus alpinus morphs in gander lake, newfoundland: roles of migration, mutation and unequal effective population sizes |
publisher |
Wiley |
publishDate |
2008 |
url |
http://dx.doi.org/10.1111/j.1095-8649.2008.02048.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1095-8649.2008.02048.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1095-8649.2008.02048.x |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic charr Arctic Newfoundland Salvelinus alpinus |
genre_facet |
Arctic charr Arctic Newfoundland Salvelinus alpinus |
op_source |
Journal of Fish Biology volume 73, issue 8, page 2040-2057 ISSN 0022-1112 1095-8649 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1095-8649.2008.02048.x |
container_title |
Journal of Fish Biology |
container_volume |
73 |
container_issue |
8 |
container_start_page |
2040 |
op_container_end_page |
2057 |
_version_ |
1802639225087066112 |