Micro geographical population structure of cod Gadus morhua in the North Sea and west of Scotland: the role of sampling loci and individuals
We investigated potential microgeographical population structure among spatial and temporal samples of cod Gadus morhua L., collected in the northern North Sea and around Scotland, using microsatellite genetic markers. Results were highly dependent on the samples and microsatellite loci included. An...
Published in: | Marine Ecology Progress Series |
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Language: | English |
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2009
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ftdtupubl:oai:pure.atira.dk:publications/13ec7be3-63e8-45af-afcc-79df6fdf67e1 2024-09-15T18:07:16+00:00 Micro geographical population structure of cod Gadus morhua in the North Sea and west of Scotland: the role of sampling loci and individuals Eg Nielsen, Einar Wright, Peter John Hansen, Jakob Hemmer Poulsen, Nina Aagaard Gibb, Lain Monroe Meldrup, Dorte 2009 https://orbit.dtu.dk/en/publications/13ec7be3-63e8-45af-afcc-79df6fdf67e1 https://doi.org/10.3354/meps07798 eng eng https://orbit.dtu.dk/en/publications/13ec7be3-63e8-45af-afcc-79df6fdf67e1 info:eu-repo/semantics/restrictedAccess Eg Nielsen , E , Wright , P J , Hansen , J H , Poulsen , N A , Gibb , L M & Meldrup , D 2009 , ' Micro geographical population structure of cod Gadus morhua in the North Sea and west of Scotland: the role of sampling loci and individuals ' , Marine Ecology Progress Series , vol. 376 , pp. 213-225 . https://doi.org/10.3354/meps07798 article 2009 ftdtupubl https://doi.org/10.3354/meps07798 2024-07-01T23:52:53Z We investigated potential microgeographical population structure among spatial and temporal samples of cod Gadus morhua L., collected in the northern North Sea and around Scotland, using microsatellite genetic markers. Results were highly dependent on the samples and microsatellite loci included. Analysis of molecular variance (AMOVA) revealed significant spatial (p = 0.04) and temporal (p = 0.02) variance when including samples of juveniles and the microsatellite Gmo 132, which is known to be subject to selection. However, neither spatial nor temporal variance components were significant (p = 0.15 and 0.23, respectively) after exclusion of juvenile samples and Gmo 132. Patterns of genetic differentiation showed a similar sensitivity to the sampling of loci. No apparent pattern was identified when only using suspected neutral microsatellites. In contrast, analysis of Gmo132 alone revealed a clear isolation of 2 samples collected at Viking and pairwise grouping of temporal adult samples from the same location. On a northeast Atlantic regional scale, inferences on local populations and patterns of population structuring were more robust to the inclusion of the microsatellite under selection. Our results demonstrate that, without cautious consideration of biased samples of individuals and loci, apparent microgeographical patterns of spatial genetic differentiation could be caused by sampling non-randomly distributed individuals of hitch-hiking selection at presumed neutral marker loci. However, while loci subject to selection may provide biased results in relation to identifying populations based on an evolutionary paradigm, they may prove valuable for separating populations on ecological time scales Article in Journal/Newspaper Gadus morhua Northeast Atlantic Technical University of Denmark: DTU Orbit Marine Ecology Progress Series 376 213 225 |
institution |
Open Polar |
collection |
Technical University of Denmark: DTU Orbit |
op_collection_id |
ftdtupubl |
language |
English |
description |
We investigated potential microgeographical population structure among spatial and temporal samples of cod Gadus morhua L., collected in the northern North Sea and around Scotland, using microsatellite genetic markers. Results were highly dependent on the samples and microsatellite loci included. Analysis of molecular variance (AMOVA) revealed significant spatial (p = 0.04) and temporal (p = 0.02) variance when including samples of juveniles and the microsatellite Gmo 132, which is known to be subject to selection. However, neither spatial nor temporal variance components were significant (p = 0.15 and 0.23, respectively) after exclusion of juvenile samples and Gmo 132. Patterns of genetic differentiation showed a similar sensitivity to the sampling of loci. No apparent pattern was identified when only using suspected neutral microsatellites. In contrast, analysis of Gmo132 alone revealed a clear isolation of 2 samples collected at Viking and pairwise grouping of temporal adult samples from the same location. On a northeast Atlantic regional scale, inferences on local populations and patterns of population structuring were more robust to the inclusion of the microsatellite under selection. Our results demonstrate that, without cautious consideration of biased samples of individuals and loci, apparent microgeographical patterns of spatial genetic differentiation could be caused by sampling non-randomly distributed individuals of hitch-hiking selection at presumed neutral marker loci. However, while loci subject to selection may provide biased results in relation to identifying populations based on an evolutionary paradigm, they may prove valuable for separating populations on ecological time scales |
format |
Article in Journal/Newspaper |
author |
Eg Nielsen, Einar Wright, Peter John Hansen, Jakob Hemmer Poulsen, Nina Aagaard Gibb, Lain Monroe Meldrup, Dorte |
spellingShingle |
Eg Nielsen, Einar Wright, Peter John Hansen, Jakob Hemmer Poulsen, Nina Aagaard Gibb, Lain Monroe Meldrup, Dorte Micro geographical population structure of cod Gadus morhua in the North Sea and west of Scotland: the role of sampling loci and individuals |
author_facet |
Eg Nielsen, Einar Wright, Peter John Hansen, Jakob Hemmer Poulsen, Nina Aagaard Gibb, Lain Monroe Meldrup, Dorte |
author_sort |
Eg Nielsen, Einar |
title |
Micro geographical population structure of cod Gadus morhua in the North Sea and west of Scotland: the role of sampling loci and individuals |
title_short |
Micro geographical population structure of cod Gadus morhua in the North Sea and west of Scotland: the role of sampling loci and individuals |
title_full |
Micro geographical population structure of cod Gadus morhua in the North Sea and west of Scotland: the role of sampling loci and individuals |
title_fullStr |
Micro geographical population structure of cod Gadus morhua in the North Sea and west of Scotland: the role of sampling loci and individuals |
title_full_unstemmed |
Micro geographical population structure of cod Gadus morhua in the North Sea and west of Scotland: the role of sampling loci and individuals |
title_sort |
micro geographical population structure of cod gadus morhua in the north sea and west of scotland: the role of sampling loci and individuals |
publishDate |
2009 |
url |
https://orbit.dtu.dk/en/publications/13ec7be3-63e8-45af-afcc-79df6fdf67e1 https://doi.org/10.3354/meps07798 |
genre |
Gadus morhua Northeast Atlantic |
genre_facet |
Gadus morhua Northeast Atlantic |
op_source |
Eg Nielsen , E , Wright , P J , Hansen , J H , Poulsen , N A , Gibb , L M & Meldrup , D 2009 , ' Micro geographical population structure of cod Gadus morhua in the North Sea and west of Scotland: the role of sampling loci and individuals ' , Marine Ecology Progress Series , vol. 376 , pp. 213-225 . https://doi.org/10.3354/meps07798 |
op_relation |
https://orbit.dtu.dk/en/publications/13ec7be3-63e8-45af-afcc-79df6fdf67e1 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.3354/meps07798 |
container_title |
Marine Ecology Progress Series |
container_volume |
376 |
container_start_page |
213 |
op_container_end_page |
225 |
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1810444655464022016 |