Seasonal variation in the habitat associations of Atlantic cod ( Gadus morhua) and American plaice ( Hippoglossoides platessoides) from the southern Gulf of St. Lawrence
We compared habitat associations of southern Gulf of St. Lawrence Atlantic cod (Gadus morhua) and American plaice (Hippoglossoides platessoides) between the summer feeding season on the Magdalen Shallows and the overwintering period in the Cabot Strait. Data were from bottom trawl surveys conducted...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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Language: | English |
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Canadian Science Publishing
1998
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Online Access: | http://dx.doi.org/10.1139/f98-122 http://www.nrcresearchpress.com/doi/pdf/10.1139/f98-122 |
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crcansciencepubl:10.1139/f98-122 2024-06-23T07:51:04+00:00 Seasonal variation in the habitat associations of Atlantic cod ( Gadus morhua) and American plaice ( Hippoglossoides platessoides) from the southern Gulf of St. Lawrence Swain, D P Chouinard, G A Morin, R Drinkwater, K F 1998 http://dx.doi.org/10.1139/f98-122 http://www.nrcresearchpress.com/doi/pdf/10.1139/f98-122 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 55, issue 12, page 2548-2561 ISSN 0706-652X 1205-7533 journal-article 1998 crcansciencepubl https://doi.org/10.1139/f98-122 2024-06-06T04:11:15Z We compared habitat associations of southern Gulf of St. Lawrence Atlantic cod (Gadus morhua) and American plaice (Hippoglossoides platessoides) between the summer feeding season on the Magdalen Shallows and the overwintering period in the Cabot Strait. Data were from bottom trawl surveys conducted in September 1993, 1994, and 1995 and January 1994, 1995, and 1996. Both species occupied much deeper, warmer water in winter than in summer. The effect of cod age on temperature distribution reversed between the two seasons, with younger cod occupying warmer water than older cod in summer and colder water in winter. Selection of both depth and temperature by cod tended to be more significant in September than in January. The reduced statistical significance of habitat selection by cod in winter was associated with a more aggregated distribution in this season. The contrast between seasons in habitat associations was particularly strong for plaice. The median habitats occupied by plaice were 58-67 m and -0.1 to 0.3°C in September and 374-426 m and 5.2-5.4°C in January. Habitat selection by plaice was significant in both seasons, but significance tended to be greater in January. Degree of aggregation in plaice distribution was similar between the two seasons. Female plaice occupied significantly warmer water than males in September but not in January. The ecological and practical implications of this striking seasonal variation in habitat associations are discussed. Article in Journal/Newspaper atlantic cod Gadus morhua Canadian Science Publishing Cabot ENVELOPE(-54.600,-54.600,-63.383,-63.383) Magdalen ENVELOPE(17.098,17.098,69.017,69.017) Canadian Journal of Fisheries and Aquatic Sciences 55 12 2548 2561 |
institution |
Open Polar |
collection |
Canadian Science Publishing |
op_collection_id |
crcansciencepubl |
language |
English |
description |
We compared habitat associations of southern Gulf of St. Lawrence Atlantic cod (Gadus morhua) and American plaice (Hippoglossoides platessoides) between the summer feeding season on the Magdalen Shallows and the overwintering period in the Cabot Strait. Data were from bottom trawl surveys conducted in September 1993, 1994, and 1995 and January 1994, 1995, and 1996. Both species occupied much deeper, warmer water in winter than in summer. The effect of cod age on temperature distribution reversed between the two seasons, with younger cod occupying warmer water than older cod in summer and colder water in winter. Selection of both depth and temperature by cod tended to be more significant in September than in January. The reduced statistical significance of habitat selection by cod in winter was associated with a more aggregated distribution in this season. The contrast between seasons in habitat associations was particularly strong for plaice. The median habitats occupied by plaice were 58-67 m and -0.1 to 0.3°C in September and 374-426 m and 5.2-5.4°C in January. Habitat selection by plaice was significant in both seasons, but significance tended to be greater in January. Degree of aggregation in plaice distribution was similar between the two seasons. Female plaice occupied significantly warmer water than males in September but not in January. The ecological and practical implications of this striking seasonal variation in habitat associations are discussed. |
format |
Article in Journal/Newspaper |
author |
Swain, D P Chouinard, G A Morin, R Drinkwater, K F |
spellingShingle |
Swain, D P Chouinard, G A Morin, R Drinkwater, K F Seasonal variation in the habitat associations of Atlantic cod ( Gadus morhua) and American plaice ( Hippoglossoides platessoides) from the southern Gulf of St. Lawrence |
author_facet |
Swain, D P Chouinard, G A Morin, R Drinkwater, K F |
author_sort |
Swain, D P |
title |
Seasonal variation in the habitat associations of Atlantic cod ( Gadus morhua) and American plaice ( Hippoglossoides platessoides) from the southern Gulf of St. Lawrence |
title_short |
Seasonal variation in the habitat associations of Atlantic cod ( Gadus morhua) and American plaice ( Hippoglossoides platessoides) from the southern Gulf of St. Lawrence |
title_full |
Seasonal variation in the habitat associations of Atlantic cod ( Gadus morhua) and American plaice ( Hippoglossoides platessoides) from the southern Gulf of St. Lawrence |
title_fullStr |
Seasonal variation in the habitat associations of Atlantic cod ( Gadus morhua) and American plaice ( Hippoglossoides platessoides) from the southern Gulf of St. Lawrence |
title_full_unstemmed |
Seasonal variation in the habitat associations of Atlantic cod ( Gadus morhua) and American plaice ( Hippoglossoides platessoides) from the southern Gulf of St. Lawrence |
title_sort |
seasonal variation in the habitat associations of atlantic cod ( gadus morhua) and american plaice ( hippoglossoides platessoides) from the southern gulf of st. lawrence |
publisher |
Canadian Science Publishing |
publishDate |
1998 |
url |
http://dx.doi.org/10.1139/f98-122 http://www.nrcresearchpress.com/doi/pdf/10.1139/f98-122 |
long_lat |
ENVELOPE(-54.600,-54.600,-63.383,-63.383) ENVELOPE(17.098,17.098,69.017,69.017) |
geographic |
Cabot Magdalen |
geographic_facet |
Cabot Magdalen |
genre |
atlantic cod Gadus morhua |
genre_facet |
atlantic cod Gadus morhua |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 55, issue 12, page 2548-2561 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f98-122 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
55 |
container_issue |
12 |
container_start_page |
2548 |
op_container_end_page |
2561 |
_version_ |
1802642062435155968 |