Population differences in antifreeze production cycles of juvenile Atlantic cod ( Gadus morhua ) reflect adaptations to overwintering environment
Four groups of juvenile Atlantic cod (Gadus morhua) were collected in summer (1992) from four coastal sites of northeast Newfoundland. They were held together at seasonally ambient temperature and photoperiod and monitored over one winter for variation in a biochemical phenotype, antifreeze producti...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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crcansciencepubl:10.1139/f99-122 2023-12-17T10:27:01+01:00 Population differences in antifreeze production cycles of juvenile Atlantic cod ( Gadus morhua ) reflect adaptations to overwintering environment Goddard, Sally V Kao, Ming H Fletcher, Garth L 1999 http://dx.doi.org/10.1139/f99-122 http://www.nrcresearchpress.com/doi/pdf/10.1139/f99-122 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 56, issue 11, page 1991-1999 ISSN 0706-652X 1205-7533 Aquatic Science Ecology, Evolution, Behavior and Systematics journal-article 1999 crcansciencepubl https://doi.org/10.1139/f99-122 2023-11-19T13:38:36Z Four groups of juvenile Atlantic cod (Gadus morhua) were collected in summer (1992) from four coastal sites of northeast Newfoundland. They were held together at seasonally ambient temperature and photoperiod and monitored over one winter for variation in a biochemical phenotype, antifreeze production capacity. Our results show that population differences in antifreeze production capacity reflect the severity of overwintering conditions faced. Cod from three bays along the northeast coast (49.5°-47.5° N) exhibited very similar patterns of antifreeze production, suggesting that these environments demand from their cod inhabitants approximately the same high level of freeze resistance. However, cod from the most exposed northerly site at the tip of the Great Northern Peninsula (51.5° N) developed antifreeze levels about 50% higher than those of the other three groups, confirming that the more extreme high-latitude environment demands even greater freeze protection for survival. Since 34% of Great Northern Peninsula cod produced antifreeze levels outside the range of all other juveniles, we suggest that the physiological distinctness of this population has evolved by genetic amplification of antifreeze production capacity rather than by selective mortality. The existence of physiological population structure should be factored into strategies for sustainable fishing of this species in northern waters. Article in Journal/Newspaper atlantic cod Gadus morhua Newfoundland Canadian Science Publishing (via Crossref) Canadian Journal of Fisheries and Aquatic Sciences 56 11 1991 1999 |
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Open Polar |
collection |
Canadian Science Publishing (via Crossref) |
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crcansciencepubl |
language |
English |
topic |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Aquatic Science Ecology, Evolution, Behavior and Systematics Goddard, Sally V Kao, Ming H Fletcher, Garth L Population differences in antifreeze production cycles of juvenile Atlantic cod ( Gadus morhua ) reflect adaptations to overwintering environment |
topic_facet |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
description |
Four groups of juvenile Atlantic cod (Gadus morhua) were collected in summer (1992) from four coastal sites of northeast Newfoundland. They were held together at seasonally ambient temperature and photoperiod and monitored over one winter for variation in a biochemical phenotype, antifreeze production capacity. Our results show that population differences in antifreeze production capacity reflect the severity of overwintering conditions faced. Cod from three bays along the northeast coast (49.5°-47.5° N) exhibited very similar patterns of antifreeze production, suggesting that these environments demand from their cod inhabitants approximately the same high level of freeze resistance. However, cod from the most exposed northerly site at the tip of the Great Northern Peninsula (51.5° N) developed antifreeze levels about 50% higher than those of the other three groups, confirming that the more extreme high-latitude environment demands even greater freeze protection for survival. Since 34% of Great Northern Peninsula cod produced antifreeze levels outside the range of all other juveniles, we suggest that the physiological distinctness of this population has evolved by genetic amplification of antifreeze production capacity rather than by selective mortality. The existence of physiological population structure should be factored into strategies for sustainable fishing of this species in northern waters. |
format |
Article in Journal/Newspaper |
author |
Goddard, Sally V Kao, Ming H Fletcher, Garth L |
author_facet |
Goddard, Sally V Kao, Ming H Fletcher, Garth L |
author_sort |
Goddard, Sally V |
title |
Population differences in antifreeze production cycles of juvenile Atlantic cod ( Gadus morhua ) reflect adaptations to overwintering environment |
title_short |
Population differences in antifreeze production cycles of juvenile Atlantic cod ( Gadus morhua ) reflect adaptations to overwintering environment |
title_full |
Population differences in antifreeze production cycles of juvenile Atlantic cod ( Gadus morhua ) reflect adaptations to overwintering environment |
title_fullStr |
Population differences in antifreeze production cycles of juvenile Atlantic cod ( Gadus morhua ) reflect adaptations to overwintering environment |
title_full_unstemmed |
Population differences in antifreeze production cycles of juvenile Atlantic cod ( Gadus morhua ) reflect adaptations to overwintering environment |
title_sort |
population differences in antifreeze production cycles of juvenile atlantic cod ( gadus morhua ) reflect adaptations to overwintering environment |
publisher |
Canadian Science Publishing |
publishDate |
1999 |
url |
http://dx.doi.org/10.1139/f99-122 http://www.nrcresearchpress.com/doi/pdf/10.1139/f99-122 |
genre |
atlantic cod Gadus morhua Newfoundland |
genre_facet |
atlantic cod Gadus morhua Newfoundland |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 56, issue 11, page 1991-1999 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f99-122 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
56 |
container_issue |
11 |
container_start_page |
1991 |
op_container_end_page |
1999 |
_version_ |
1785578781153427456 |