Variability of northeast Arctic cod (Gadus morhua) distribution on the main spawning grounds in relation to biophysical factors
Early life stages may on average gain a survival benefit from the regular return of parent fish to the same spawning grounds. Such areas may have a considerable spatial extent, occupation of which varies between spawning seasons. Northeast Arctic cod (Gadus morhua) is an ideal candidate to pinpoint...
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Language: | English |
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Oxford University Press (OUP)
2014
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Online Access: | http://dx.doi.org/10.1093/icesjms/fsu126 http://academic.oup.com/icesjms/article-pdf/71/6/1317/29147860/fsu126.pdf |
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croxfordunivpr:10.1093/icesjms/fsu126 2024-09-15T17:52:27+00:00 Variability of northeast Arctic cod (Gadus morhua) distribution on the main spawning grounds in relation to biophysical factors Höffle, H. Solemdal, P. Korsbrekke, K. Johannessen, M. Bakkeplass, K. Kjesbu, O. S. 2014 http://dx.doi.org/10.1093/icesjms/fsu126 http://academic.oup.com/icesjms/article-pdf/71/6/1317/29147860/fsu126.pdf en eng Oxford University Press (OUP) ICES Journal of Marine Science volume 71, issue 6, page 1317-1331 ISSN 1054-3139 1095-9289 journal-article 2014 croxfordunivpr https://doi.org/10.1093/icesjms/fsu126 2024-07-22T04:23:18Z Early life stages may on average gain a survival benefit from the regular return of parent fish to the same spawning grounds. Such areas may have a considerable spatial extent, occupation of which varies between spawning seasons. Northeast Arctic cod (Gadus morhua) is an ideal candidate to pinpoint the most influential biophysical factors in these respects due to its data richness and apparently strong “homing” behaviour. Their main spawning grounds, off northern Norway, are split in two by the Lofoten archipelago, and in the previous decade strong spawning activity was observed on the seaward continental shelf (Yttersida), while in recent years spawning activity in the wide fjord (Vestfjorden), that separates the islands from the Norwegian mainland, has again increased. Time-series of egg distribution were available from the 1980s, 1990s, and 2004–2012. We used several fixed and random factors to construct a statistical model for the distribution of recently spawned eggs, and hence, spawning adults in either area. We show that the most relevant covariates for the spatial distribution of eggs in Vestfjorden are local temperature and bathymetry, while at Yttersida influence affecting the whole stock, like regional ocean climate and age structure appear more important. Therefore, spawning inside the fjord may be constrained by suboptimal environmental conditions. Yttersida may be occupied by fish which have been displaced out of Vestfjorden when preferred conditions there are of limited extent. Article in Journal/Newspaper Arctic cod Gadus morhua Lofoten Northeast Arctic cod Northern Norway Vestfjorden Oxford University Press ICES Journal of Marine Science 71 6 1317 1331 |
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Open Polar |
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Oxford University Press |
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croxfordunivpr |
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English |
description |
Early life stages may on average gain a survival benefit from the regular return of parent fish to the same spawning grounds. Such areas may have a considerable spatial extent, occupation of which varies between spawning seasons. Northeast Arctic cod (Gadus morhua) is an ideal candidate to pinpoint the most influential biophysical factors in these respects due to its data richness and apparently strong “homing” behaviour. Their main spawning grounds, off northern Norway, are split in two by the Lofoten archipelago, and in the previous decade strong spawning activity was observed on the seaward continental shelf (Yttersida), while in recent years spawning activity in the wide fjord (Vestfjorden), that separates the islands from the Norwegian mainland, has again increased. Time-series of egg distribution were available from the 1980s, 1990s, and 2004–2012. We used several fixed and random factors to construct a statistical model for the distribution of recently spawned eggs, and hence, spawning adults in either area. We show that the most relevant covariates for the spatial distribution of eggs in Vestfjorden are local temperature and bathymetry, while at Yttersida influence affecting the whole stock, like regional ocean climate and age structure appear more important. Therefore, spawning inside the fjord may be constrained by suboptimal environmental conditions. Yttersida may be occupied by fish which have been displaced out of Vestfjorden when preferred conditions there are of limited extent. |
format |
Article in Journal/Newspaper |
author |
Höffle, H. Solemdal, P. Korsbrekke, K. Johannessen, M. Bakkeplass, K. Kjesbu, O. S. |
spellingShingle |
Höffle, H. Solemdal, P. Korsbrekke, K. Johannessen, M. Bakkeplass, K. Kjesbu, O. S. Variability of northeast Arctic cod (Gadus morhua) distribution on the main spawning grounds in relation to biophysical factors |
author_facet |
Höffle, H. Solemdal, P. Korsbrekke, K. Johannessen, M. Bakkeplass, K. Kjesbu, O. S. |
author_sort |
Höffle, H. |
title |
Variability of northeast Arctic cod (Gadus morhua) distribution on the main spawning grounds in relation to biophysical factors |
title_short |
Variability of northeast Arctic cod (Gadus morhua) distribution on the main spawning grounds in relation to biophysical factors |
title_full |
Variability of northeast Arctic cod (Gadus morhua) distribution on the main spawning grounds in relation to biophysical factors |
title_fullStr |
Variability of northeast Arctic cod (Gadus morhua) distribution on the main spawning grounds in relation to biophysical factors |
title_full_unstemmed |
Variability of northeast Arctic cod (Gadus morhua) distribution on the main spawning grounds in relation to biophysical factors |
title_sort |
variability of northeast arctic cod (gadus morhua) distribution on the main spawning grounds in relation to biophysical factors |
publisher |
Oxford University Press (OUP) |
publishDate |
2014 |
url |
http://dx.doi.org/10.1093/icesjms/fsu126 http://academic.oup.com/icesjms/article-pdf/71/6/1317/29147860/fsu126.pdf |
genre |
Arctic cod Gadus morhua Lofoten Northeast Arctic cod Northern Norway Vestfjorden |
genre_facet |
Arctic cod Gadus morhua Lofoten Northeast Arctic cod Northern Norway Vestfjorden |
op_source |
ICES Journal of Marine Science volume 71, issue 6, page 1317-1331 ISSN 1054-3139 1095-9289 |
op_doi |
https://doi.org/10.1093/icesjms/fsu126 |
container_title |
ICES Journal of Marine Science |
container_volume |
71 |
container_issue |
6 |
container_start_page |
1317 |
op_container_end_page |
1331 |
_version_ |
1810294477553664000 |