Seasonal dynamics of growth and mortality suggest contrasting population structure and ecology for cod, pollack, and saithe in a Norwegian fjord
<qd> Heino, M., Svåsand, T., Nordeide, J. T., Otterå, H. 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, doi:10.1093/icesjms/fss043. </qd>We study the dynam...
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fthighwire:oai:open-archive.highwire.org:icesjms:fss043v1 2023-05-15T15:27:43+02:00 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 2012-03-13 06:32:53.0 text/html http://icesjms.oxfordjournals.org/cgi/content/short/fss043v1 https://doi.org/10.1093/icesjms/fss043 en eng Oxford University Press http://icesjms.oxfordjournals.org/cgi/content/short/fss043v1 http://dx.doi.org/10.1093/icesjms/fss043 Copyright (C) 2012, International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer Article TEXT 2012 fthighwire https://doi.org/10.1093/icesjms/fss043 2013-05-26T22:47:31Z <qd> Heino, M., Svåsand, T., Nordeide, J. T., Otterå, H. 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, doi:10.1093/icesjms/fss043. </qd>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. Text atlantic cod Gadus morhua HighWire Press (Stanford University) Norway Otterå ENVELOPE(16.589,16.589,68.536,68.536) ICES Journal of Marine Science 69 4 537 546 |
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HighWire Press (Stanford University) |
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English |
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Article 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 |
Article |
description |
<qd> Heino, M., Svåsand, T., Nordeide, J. T., Otterå, H. 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, doi:10.1093/icesjms/fss043. </qd>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 |
Text |
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 |
publishDate |
2012 |
url |
http://icesjms.oxfordjournals.org/cgi/content/short/fss043v1 https://doi.org/10.1093/icesjms/fss043 |
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_relation |
http://icesjms.oxfordjournals.org/cgi/content/short/fss043v1 http://dx.doi.org/10.1093/icesjms/fss043 |
op_rights |
Copyright (C) 2012, International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer |
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_ |
1766358130797576192 |