The effects of isolation and colonization history on the genetic structure of marine-relict populations of Atlantic cod ( Gadus morhua ) in the Canadian Arctic
The genetic consequences of extended periods at low population size are fundamental to the conservation of depleted species such as the Atlantic cod (Gadus morhua). We compared microsatellite genetic variability among cod populations in Canadian Arctic lakes with that of Gilbert Bay resident and ins...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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Online Access: | http://dx.doi.org/10.1139/f06-085 http://www.nrcresearchpress.com/doi/pdf/10.1139/f06-085 |
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crcansciencepubl:10.1139/f06-085 2023-12-17T10:24:05+01:00 The effects of isolation and colonization history on the genetic structure of marine-relict populations of Atlantic cod ( Gadus morhua ) in the Canadian Arctic Hardie, David C Gillett, Roxanne M Hutchings, Jeffrey A 2006 http://dx.doi.org/10.1139/f06-085 http://www.nrcresearchpress.com/doi/pdf/10.1139/f06-085 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 63, issue 8, page 1830-1839 ISSN 0706-652X 1205-7533 Aquatic Science Ecology, Evolution, Behavior and Systematics journal-article 2006 crcansciencepubl https://doi.org/10.1139/f06-085 2023-11-19T13:38:37Z The genetic consequences of extended periods at low population size are fundamental to the conservation of depleted species such as the Atlantic cod (Gadus morhua). We compared microsatellite genetic variability among cod populations in Canadian Arctic lakes with that of Gilbert Bay resident and inshore cod from eastern Canada. The Arctic populations had the lowest genetic diversity and were the most strongly genetically structured and distinct. By contrast, eastern Canadian samples expressed high allelic diversity and were not significantly genetically structured or distinct relative to each other, whereas Gilbert Bay resident cod were intermediate to the Arctic and eastern Canadian groups. Our results are consistent with the hypothesis that the Arctic populations were colonized between 8000 and 5000 years ago and have experienced little or no gene flow since that time. Despite isolation at the extreme of the species' range, the Arctic populations have retained relatively high heterozygosities and high genetic effective population sizes relative to census sizes (N e –N c ratios). Potential explanations for this include the absence of fishing pressure, allowing for the persistence of large, highly fecund individuals, as well as biotic (e.g., absence of planktivores) and abiotic (e.g., low environmental stochasticity) factors in the Arctic lakes that minimize individual variance in reproductive success. Article in Journal/Newspaper Arctic atlantic cod Gadus morhua Canadian Science Publishing (via Crossref) Arctic Canada Gilbert Bay ENVELOPE(-55.998,-55.998,52.633,52.633) Canadian Journal of Fisheries and Aquatic Sciences 63 8 1830 1839 |
institution |
Open Polar |
collection |
Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Aquatic Science Ecology, Evolution, Behavior and Systematics Hardie, David C Gillett, Roxanne M Hutchings, Jeffrey A The effects of isolation and colonization history on the genetic structure of marine-relict populations of Atlantic cod ( Gadus morhua ) in the Canadian Arctic |
topic_facet |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
description |
The genetic consequences of extended periods at low population size are fundamental to the conservation of depleted species such as the Atlantic cod (Gadus morhua). We compared microsatellite genetic variability among cod populations in Canadian Arctic lakes with that of Gilbert Bay resident and inshore cod from eastern Canada. The Arctic populations had the lowest genetic diversity and were the most strongly genetically structured and distinct. By contrast, eastern Canadian samples expressed high allelic diversity and were not significantly genetically structured or distinct relative to each other, whereas Gilbert Bay resident cod were intermediate to the Arctic and eastern Canadian groups. Our results are consistent with the hypothesis that the Arctic populations were colonized between 8000 and 5000 years ago and have experienced little or no gene flow since that time. Despite isolation at the extreme of the species' range, the Arctic populations have retained relatively high heterozygosities and high genetic effective population sizes relative to census sizes (N e –N c ratios). Potential explanations for this include the absence of fishing pressure, allowing for the persistence of large, highly fecund individuals, as well as biotic (e.g., absence of planktivores) and abiotic (e.g., low environmental stochasticity) factors in the Arctic lakes that minimize individual variance in reproductive success. |
format |
Article in Journal/Newspaper |
author |
Hardie, David C Gillett, Roxanne M Hutchings, Jeffrey A |
author_facet |
Hardie, David C Gillett, Roxanne M Hutchings, Jeffrey A |
author_sort |
Hardie, David C |
title |
The effects of isolation and colonization history on the genetic structure of marine-relict populations of Atlantic cod ( Gadus morhua ) in the Canadian Arctic |
title_short |
The effects of isolation and colonization history on the genetic structure of marine-relict populations of Atlantic cod ( Gadus morhua ) in the Canadian Arctic |
title_full |
The effects of isolation and colonization history on the genetic structure of marine-relict populations of Atlantic cod ( Gadus morhua ) in the Canadian Arctic |
title_fullStr |
The effects of isolation and colonization history on the genetic structure of marine-relict populations of Atlantic cod ( Gadus morhua ) in the Canadian Arctic |
title_full_unstemmed |
The effects of isolation and colonization history on the genetic structure of marine-relict populations of Atlantic cod ( Gadus morhua ) in the Canadian Arctic |
title_sort |
effects of isolation and colonization history on the genetic structure of marine-relict populations of atlantic cod ( gadus morhua ) in the canadian arctic |
publisher |
Canadian Science Publishing |
publishDate |
2006 |
url |
http://dx.doi.org/10.1139/f06-085 http://www.nrcresearchpress.com/doi/pdf/10.1139/f06-085 |
long_lat |
ENVELOPE(-55.998,-55.998,52.633,52.633) |
geographic |
Arctic Canada Gilbert Bay |
geographic_facet |
Arctic Canada Gilbert Bay |
genre |
Arctic atlantic cod Gadus morhua |
genre_facet |
Arctic atlantic cod Gadus morhua |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 63, issue 8, page 1830-1839 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f06-085 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
63 |
container_issue |
8 |
container_start_page |
1830 |
op_container_end_page |
1839 |
_version_ |
1785562694925942784 |