Seasonal dynamics of growth and mortality suggest contrasting population structure and ecology for cod, pollack, and saithe in a Norwegian fjord
We study the dynamics of Atlantic cod (Gadus morhua L.), pollack (Pollachius pollachius L.), and saite (Pollachius virens L.) in Masfjorden, a small fjord in western Norway. Annually, cohorts of pollack and cod grow in size and decline in abundance, as expected of closed populations, whereas saithe...
Published in: | ICES Journal of Marine Science |
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Format: | Article in Journal/Newspaper |
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Oxford University Press
2012
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Online Access: | https://pure.iiasa.ac.at/id/eprint/9969/ https://doi.org/10.1093/icesjms/fss043 |
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ftiiasalaxenburg:oai:pure.iiasa.ac.at:9969 2023-05-15T15:27:36+02:00 Seasonal dynamics of growth and mortality suggest contrasting population structure and ecology for cod, pollack, and saithe in a Norwegian fjord Heino, M. Svasand, T. Nordeide, J.T. Ottera, H. 2012-05 https://pure.iiasa.ac.at/id/eprint/9969/ https://doi.org/10.1093/icesjms/fss043 unknown Oxford University Press Heino, M. <https://pure.iiasa.ac.at/view/iiasa/122.html> orcid:0000-0003-2928-3940 , Svasand, T., Nordeide, J.T., & Ottera, H. (2012). Seasonal dynamics of growth and mortality suggest contrasting population structure and ecology for cod, pollack, and saithe in a Norwegian fjord. ICES Journal of Marine Science 69 (4) 537-546. 10.1093/icesjms/fss043 <https://doi.org/10.1093/icesjms%2Ffss043>. doi:10.1093/icesjms/fss043 Article PeerReviewed 2012 ftiiasalaxenburg https://doi.org/10.1093/icesjms/fss043 2023-04-07T14:49:32Z We study the dynamics of Atlantic cod (Gadus morhua L.), pollack (Pollachius pollachius L.), and saite (Pollachius virens L.) in Masfjorden, a small fjord in western Norway. Annually, cohorts of pollack and cod grow in size and decline in abundance, as expected of closed populations, whereas saithe virtually disappear before maturity. Seasonally, in contrast, the dynamics of cod and pollack differ. Pollack shows a regular growth pattern, with most of the growth taking place in summer. Its abundance-at-age shows strong seasonal variations, with a marked increase from spring to summer followed by a decline through autumn and winter. These patterns relate partly to seasonal changes in depth distribution and catchability. Combined with the observation that spawning-stage pollack are abundant in spring, we interpret these patterns to suggest that pollack in Masfjorden represent a dynamically independent unit. Seasonal changes in abundance are less marked for cod, and seasonal changes in depth distribution seem insignificant. However, cod shows an unusual pattern in length at age, with no apparent growth in summer and fast growth in autumn. These patterns suggest that the population structure of cod may be more open than that of pollack and may involve mixing of more than one population component. Article in Journal/Newspaper atlantic cod Gadus morhua IIASA PURE (International Institute of Applied Systems Analysis: PUblications REpository) Norway ICES Journal of Marine Science 69 4 537 546 |
institution |
Open Polar |
collection |
IIASA PURE (International Institute of Applied Systems Analysis: PUblications REpository) |
op_collection_id |
ftiiasalaxenburg |
language |
unknown |
description |
We study the dynamics of Atlantic cod (Gadus morhua L.), pollack (Pollachius pollachius L.), and saite (Pollachius virens L.) in Masfjorden, a small fjord in western Norway. Annually, cohorts of pollack and cod grow in size and decline in abundance, as expected of closed populations, whereas saithe virtually disappear before maturity. Seasonally, in contrast, the dynamics of cod and pollack differ. Pollack shows a regular growth pattern, with most of the growth taking place in summer. Its abundance-at-age shows strong seasonal variations, with a marked increase from spring to summer followed by a decline through autumn and winter. These patterns relate partly to seasonal changes in depth distribution and catchability. Combined with the observation that spawning-stage pollack are abundant in spring, we interpret these patterns to suggest that pollack in Masfjorden represent a dynamically independent unit. Seasonal changes in abundance are less marked for cod, and seasonal changes in depth distribution seem insignificant. However, cod shows an unusual pattern in length at age, with no apparent growth in summer and fast growth in autumn. These patterns suggest that the population structure of cod may be more open than that of pollack and may involve mixing of more than one population component. |
format |
Article in Journal/Newspaper |
author |
Heino, M. Svasand, T. Nordeide, J.T. Ottera, H. |
spellingShingle |
Heino, M. Svasand, T. Nordeide, J.T. Ottera, H. Seasonal dynamics of growth and mortality suggest contrasting population structure and ecology for cod, pollack, and saithe in a Norwegian fjord |
author_facet |
Heino, M. Svasand, T. Nordeide, J.T. Ottera, H. |
author_sort |
Heino, M. |
title |
Seasonal dynamics of growth and mortality suggest contrasting population structure and ecology for cod, pollack, and saithe in a Norwegian fjord |
title_short |
Seasonal dynamics of growth and mortality suggest contrasting population structure and ecology for cod, pollack, and saithe in a Norwegian fjord |
title_full |
Seasonal dynamics of growth and mortality suggest contrasting population structure and ecology for cod, pollack, and saithe in a Norwegian fjord |
title_fullStr |
Seasonal dynamics of growth and mortality suggest contrasting population structure and ecology for cod, pollack, and saithe in a Norwegian fjord |
title_full_unstemmed |
Seasonal dynamics of growth and mortality suggest contrasting population structure and ecology for cod, pollack, and saithe in a Norwegian fjord |
title_sort |
seasonal dynamics of growth and mortality suggest contrasting population structure and ecology for cod, pollack, and saithe in a norwegian fjord |
publisher |
Oxford University Press |
publishDate |
2012 |
url |
https://pure.iiasa.ac.at/id/eprint/9969/ https://doi.org/10.1093/icesjms/fss043 |
geographic |
Norway |
geographic_facet |
Norway |
genre |
atlantic cod Gadus morhua |
genre_facet |
atlantic cod Gadus morhua |
op_relation |
Heino, M. <https://pure.iiasa.ac.at/view/iiasa/122.html> orcid:0000-0003-2928-3940 , Svasand, T., Nordeide, J.T., & Ottera, H. (2012). Seasonal dynamics of growth and mortality suggest contrasting population structure and ecology for cod, pollack, and saithe in a Norwegian fjord. ICES Journal of Marine Science 69 (4) 537-546. 10.1093/icesjms/fss043 <https://doi.org/10.1093/icesjms%2Ffss043>. doi:10.1093/icesjms/fss043 |
op_doi |
https://doi.org/10.1093/icesjms/fss043 |
container_title |
ICES Journal of Marine Science |
container_volume |
69 |
container_issue |
4 |
container_start_page |
537 |
op_container_end_page |
546 |
_version_ |
1766358022234308608 |