A mitogenomic approach to the taxonomy of pollocks: Theragra chalcogrammaand T. finnmarchicarepresent one single species
Abstract Background The walleye pollock ( Theragra chalcogramma ) and Norwegian pollock ( T. finnmarchica ) are confined to the North Pacific and North Atlantic Oceans, respectively, and considered as distinct species within the family Gadidae. We have determined the complete mtDNA nucleotide sequen...
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ftbiomed:oai:biomedcentral.com:1471-2148-7-86 2023-05-15T15:27:34+02:00 A mitogenomic approach to the taxonomy of pollocks: Theragra chalcogrammaand T. finnmarchicarepresent one single species Ursvik, Anita Breines, Ragna Christiansen, Jørgen Fevolden, Svein-Erik Coucheron, Dag H Johansen, Steinar D 2007-06-07 http://www.biomedcentral.com/1471-2148/7/86 en eng BioMed Central Ltd. http://www.biomedcentral.com/1471-2148/7/86 Copyright 2007 Ursvik et al; licensee BioMed Central Ltd. Research article 2007 ftbiomed 2007-11-11T15:25:12Z Abstract Background The walleye pollock ( Theragra chalcogramma ) and Norwegian pollock ( T. finnmarchica ) are confined to the North Pacific and North Atlantic Oceans, respectively, and considered as distinct species within the family Gadidae. We have determined the complete mtDNA nucleotide sequence of two specimens of Norwegian pollock and compared the sequences to that of 10 specimens of walleye pollock representing stocks from the Sea of Japan and the Bering Sea, 2 specimens of Atlantic cod ( Gadus morhua ), and 2 specimens of haddock ( Melanogrammus aeglefinus ). Results A total number of 204 variable positions were identified among the 12 pollock specimens, but no specific substitution pattern could be identified between the walleye and Norwegian pollocks. Phylogenetic analysis using 16.500 homologous mtDNA nucleotide positions clearly identify the Norwegian pollock within the walleye pollock species cluster. Furthermore, the Norwegian pollock sequences were most similar to mitochondrial genotypes present in walleye pollock specimens from the Sea of Japan, an observation supported both by neighbor-joining, maximum parsimony, and maximum likelihood analyses. Conclusion We infer that walleye pollock and Norwegian pollock represent one single species and that Norwegian pollock has been recently introduced from the Pacific to the Atlantic Oceans. Article in Journal/Newspaper atlantic cod Bering Sea Gadus morhua North Atlantic norwegian pollock Theragra chalcogramma BioMed Central Bering Sea Pacific |
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BioMed Central |
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ftbiomed |
language |
English |
description |
Abstract Background The walleye pollock ( Theragra chalcogramma ) and Norwegian pollock ( T. finnmarchica ) are confined to the North Pacific and North Atlantic Oceans, respectively, and considered as distinct species within the family Gadidae. We have determined the complete mtDNA nucleotide sequence of two specimens of Norwegian pollock and compared the sequences to that of 10 specimens of walleye pollock representing stocks from the Sea of Japan and the Bering Sea, 2 specimens of Atlantic cod ( Gadus morhua ), and 2 specimens of haddock ( Melanogrammus aeglefinus ). Results A total number of 204 variable positions were identified among the 12 pollock specimens, but no specific substitution pattern could be identified between the walleye and Norwegian pollocks. Phylogenetic analysis using 16.500 homologous mtDNA nucleotide positions clearly identify the Norwegian pollock within the walleye pollock species cluster. Furthermore, the Norwegian pollock sequences were most similar to mitochondrial genotypes present in walleye pollock specimens from the Sea of Japan, an observation supported both by neighbor-joining, maximum parsimony, and maximum likelihood analyses. Conclusion We infer that walleye pollock and Norwegian pollock represent one single species and that Norwegian pollock has been recently introduced from the Pacific to the Atlantic Oceans. |
format |
Article in Journal/Newspaper |
author |
Ursvik, Anita Breines, Ragna Christiansen, Jørgen Fevolden, Svein-Erik Coucheron, Dag H Johansen, Steinar D |
spellingShingle |
Ursvik, Anita Breines, Ragna Christiansen, Jørgen Fevolden, Svein-Erik Coucheron, Dag H Johansen, Steinar D A mitogenomic approach to the taxonomy of pollocks: Theragra chalcogrammaand T. finnmarchicarepresent one single species |
author_facet |
Ursvik, Anita Breines, Ragna Christiansen, Jørgen Fevolden, Svein-Erik Coucheron, Dag H Johansen, Steinar D |
author_sort |
Ursvik, Anita |
title |
A mitogenomic approach to the taxonomy of pollocks: Theragra chalcogrammaand T. finnmarchicarepresent one single species |
title_short |
A mitogenomic approach to the taxonomy of pollocks: Theragra chalcogrammaand T. finnmarchicarepresent one single species |
title_full |
A mitogenomic approach to the taxonomy of pollocks: Theragra chalcogrammaand T. finnmarchicarepresent one single species |
title_fullStr |
A mitogenomic approach to the taxonomy of pollocks: Theragra chalcogrammaand T. finnmarchicarepresent one single species |
title_full_unstemmed |
A mitogenomic approach to the taxonomy of pollocks: Theragra chalcogrammaand T. finnmarchicarepresent one single species |
title_sort |
mitogenomic approach to the taxonomy of pollocks: theragra chalcogrammaand t. finnmarchicarepresent one single species |
publisher |
BioMed Central Ltd. |
publishDate |
2007 |
url |
http://www.biomedcentral.com/1471-2148/7/86 |
geographic |
Bering Sea Pacific |
geographic_facet |
Bering Sea Pacific |
genre |
atlantic cod Bering Sea Gadus morhua North Atlantic norwegian pollock Theragra chalcogramma |
genre_facet |
atlantic cod Bering Sea Gadus morhua North Atlantic norwegian pollock Theragra chalcogramma |
op_relation |
http://www.biomedcentral.com/1471-2148/7/86 |
op_rights |
Copyright 2007 Ursvik et al; licensee BioMed Central Ltd. |
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1766357991955628032 |