Seasonal dynamics of growth and mortality suggest contrasting population structure and ecology for cod, pollack, and saithe in a Norwegian fjord
Abstract Heino, M., Svåsand, T., Nordeide, J. T., Otterå, 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: 537–546. We study the dynamics of Atlantic cod (G...
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Online Access: | http://dx.doi.org/10.1093/icesjms/fss043 http://academic.oup.com/icesjms/article-pdf/69/4/537/29143493/fss043.pdf |
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croxfordunivpr:10.1093/icesjms/fss043 2024-02-04T09:58:49+01:00 Seasonal dynamics of growth and mortality suggest contrasting population structure and ecology for cod, pollack, and saithe in a Norwegian fjord Heino, Mikko Svåsand, Terje Nordeide, Jarle Tryti Otterå, Håkon 2012 http://dx.doi.org/10.1093/icesjms/fss043 http://academic.oup.com/icesjms/article-pdf/69/4/537/29143493/fss043.pdf en eng Oxford University Press (OUP) ICES Journal of Marine Science volume 69, issue 4, page 537-546 ISSN 1095-9289 1054-3139 Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics Oceanography journal-article 2012 croxfordunivpr https://doi.org/10.1093/icesjms/fss043 2024-01-05T09:23:08Z Abstract Heino, M., Svåsand, T., Nordeide, J. T., Otterå, 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: 537–546. We study the dynamics of Atlantic cod (Gadus morhua L.), pollack (Pollachius pollachius L.), and saithe (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 Oxford University Press (via Crossref) Norway Otterå ENVELOPE(16.589,16.589,68.536,68.536) ICES Journal of Marine Science 69 4 537 546 |
institution |
Open Polar |
collection |
Oxford University Press (via Crossref) |
op_collection_id |
croxfordunivpr |
language |
English |
topic |
Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics Oceanography |
spellingShingle |
Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics Oceanography Heino, Mikko Svåsand, Terje Nordeide, Jarle Tryti Otterå, Håkon Seasonal dynamics of growth and mortality suggest contrasting population structure and ecology for cod, pollack, and saithe in a Norwegian fjord |
topic_facet |
Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics Oceanography |
description |
Abstract Heino, M., Svåsand, T., Nordeide, J. T., Otterå, 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: 537–546. We study the dynamics of Atlantic cod (Gadus morhua L.), pollack (Pollachius pollachius L.), and saithe (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, Mikko Svåsand, Terje Nordeide, Jarle Tryti Otterå, Håkon |
author_facet |
Heino, Mikko Svåsand, Terje Nordeide, Jarle Tryti Otterå, Håkon |
author_sort |
Heino, Mikko |
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 (OUP) |
publishDate |
2012 |
url |
http://dx.doi.org/10.1093/icesjms/fss043 http://academic.oup.com/icesjms/article-pdf/69/4/537/29143493/fss043.pdf |
long_lat |
ENVELOPE(16.589,16.589,68.536,68.536) |
geographic |
Norway Otterå |
geographic_facet |
Norway Otterå |
genre |
atlantic cod Gadus morhua |
genre_facet |
atlantic cod Gadus morhua |
op_source |
ICES Journal of Marine Science volume 69, issue 4, page 537-546 ISSN 1095-9289 1054-3139 |
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_ |
1789963387651751936 |