Macoma balthica in the White and Barents Seas: properties of a widespread marine hybrid swarm (Mollusca: Bivalvia)
Abstract A main molecular subdivision in the circumpolar Macoma balthica complex has been described between Atlantic and Pacific taxa. In NE Europe, the clams of the White and Barents Seas, however, show deviant genetic structures. Using allozyme and mitochondrial DNA data, we explore the hypothesis...
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crwiley:10.1111/j.1365-294x.2007.03463.x 2024-06-23T07:51:38+00:00 Macoma balthica in the White and Barents Seas: properties of a widespread marine hybrid swarm (Mollusca: Bivalvia) STRELKOV, PETR NIKULA, RAISA VÄINÖLÄ, RISTO 2007 http://dx.doi.org/10.1111/j.1365-294x.2007.03463.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1365-294X.2007.03463.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1365-294X.2007.03463.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor http://doi.wiley.com/10.1002/tdm_license_1 http://onlinelibrary.wiley.com/termsAndConditions Molecular Ecology volume 16, issue 19, page 4110-4127 ISSN 0962-1083 1365-294X journal-article 2007 crwiley https://doi.org/10.1111/j.1365-294x.2007.03463.x 2024-05-31T08:15:09Z Abstract A main molecular subdivision in the circumpolar Macoma balthica complex has been described between Atlantic and Pacific taxa. In NE Europe, the clams of the White and Barents Seas, however, show deviant genetic structures. Using allozyme and mitochondrial DNA data, we explore the hypothesis that these deviations result from hybridization between an Atlantic ( M. b. rubra ) and an invading Pacific ( M. b. balthica ) lineage. A practically pure Atlantic Macoma extends from France north to the Varanger Peninsula (NE Norway), whereas populations farther east have genetic compositions intermediate between true Atlantic and true Pacific. Admixture estimates range from 32 to 90% Pacific contribution, with a notable deviation in a nearly pure Atlantic outpost in the Mezen Bay (NE White Sea). The pattern of variation is not one of a simple collinear mixing however. Different characters exhibit different degrees of introgression, and the relative introgression varies regionally. Yet, there are practically no interlocus genotypic disequilibria between the diverged loci, which brings out the White Sea–Barents Sea M. balthica as the best‐documented marine animal hybrid swarms so far, arisen through amalgamation of genomes previously isolated since pre‐Pleistocene times. On top of the main admixture pattern, strong geographical structuring is also seen in characters unrelated to the principal systematic distinction. The persistence of the regional patterns indicates restricted gene flow at the present time, despite the high dispersal potential of the species. The causes of this structuring could be in a complex history of colonization events and features of local hydrography enhancing isolation and divergence of populations. Article in Journal/Newspaper Barents Sea Mezen Bay Varanger White Sea Wiley Online Library Barents Sea Norway Pacific White Sea Molecular Ecology 16 19 4110 4127 |
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Wiley Online Library |
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crwiley |
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English |
description |
Abstract A main molecular subdivision in the circumpolar Macoma balthica complex has been described between Atlantic and Pacific taxa. In NE Europe, the clams of the White and Barents Seas, however, show deviant genetic structures. Using allozyme and mitochondrial DNA data, we explore the hypothesis that these deviations result from hybridization between an Atlantic ( M. b. rubra ) and an invading Pacific ( M. b. balthica ) lineage. A practically pure Atlantic Macoma extends from France north to the Varanger Peninsula (NE Norway), whereas populations farther east have genetic compositions intermediate between true Atlantic and true Pacific. Admixture estimates range from 32 to 90% Pacific contribution, with a notable deviation in a nearly pure Atlantic outpost in the Mezen Bay (NE White Sea). The pattern of variation is not one of a simple collinear mixing however. Different characters exhibit different degrees of introgression, and the relative introgression varies regionally. Yet, there are practically no interlocus genotypic disequilibria between the diverged loci, which brings out the White Sea–Barents Sea M. balthica as the best‐documented marine animal hybrid swarms so far, arisen through amalgamation of genomes previously isolated since pre‐Pleistocene times. On top of the main admixture pattern, strong geographical structuring is also seen in characters unrelated to the principal systematic distinction. The persistence of the regional patterns indicates restricted gene flow at the present time, despite the high dispersal potential of the species. The causes of this structuring could be in a complex history of colonization events and features of local hydrography enhancing isolation and divergence of populations. |
format |
Article in Journal/Newspaper |
author |
STRELKOV, PETR NIKULA, RAISA VÄINÖLÄ, RISTO |
spellingShingle |
STRELKOV, PETR NIKULA, RAISA VÄINÖLÄ, RISTO Macoma balthica in the White and Barents Seas: properties of a widespread marine hybrid swarm (Mollusca: Bivalvia) |
author_facet |
STRELKOV, PETR NIKULA, RAISA VÄINÖLÄ, RISTO |
author_sort |
STRELKOV, PETR |
title |
Macoma balthica in the White and Barents Seas: properties of a widespread marine hybrid swarm (Mollusca: Bivalvia) |
title_short |
Macoma balthica in the White and Barents Seas: properties of a widespread marine hybrid swarm (Mollusca: Bivalvia) |
title_full |
Macoma balthica in the White and Barents Seas: properties of a widespread marine hybrid swarm (Mollusca: Bivalvia) |
title_fullStr |
Macoma balthica in the White and Barents Seas: properties of a widespread marine hybrid swarm (Mollusca: Bivalvia) |
title_full_unstemmed |
Macoma balthica in the White and Barents Seas: properties of a widespread marine hybrid swarm (Mollusca: Bivalvia) |
title_sort |
macoma balthica in the white and barents seas: properties of a widespread marine hybrid swarm (mollusca: bivalvia) |
publisher |
Wiley |
publishDate |
2007 |
url |
http://dx.doi.org/10.1111/j.1365-294x.2007.03463.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1365-294X.2007.03463.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1365-294X.2007.03463.x |
geographic |
Barents Sea Norway Pacific White Sea |
geographic_facet |
Barents Sea Norway Pacific White Sea |
genre |
Barents Sea Mezen Bay Varanger White Sea |
genre_facet |
Barents Sea Mezen Bay Varanger White Sea |
op_source |
Molecular Ecology volume 16, issue 19, page 4110-4127 ISSN 0962-1083 1365-294X |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor http://doi.wiley.com/10.1002/tdm_license_1 http://onlinelibrary.wiley.com/termsAndConditions |
op_doi |
https://doi.org/10.1111/j.1365-294x.2007.03463.x |
container_title |
Molecular Ecology |
container_volume |
16 |
container_issue |
19 |
container_start_page |
4110 |
op_container_end_page |
4127 |
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1802642761332031488 |