Reproductive strategy of a migratory fish stock: implications of spatial variations in natural mortality
We investigate how the reproductive strategy in a migratory marine fish may be influenced by spatial variations in mortality in early life stages. In particular, we examine how spawning time and location affect offspring survival and growth. A drift model for early life stages (eggs to age 1) of the...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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crcansciencepubl:10.1139/cjfas-2015-0321 2024-05-19T07:38:08+00:00 Reproductive strategy of a migratory fish stock: implications of spatial variations in natural mortality Langangen, Øystein Ottersen, Geir Ciannelli, Lorenzo Vikebø, Frode B. Stige, Leif Christian 2016 http://dx.doi.org/10.1139/cjfas-2015-0321 http://www.nrcresearchpress.com/doi/full-xml/10.1139/cjfas-2015-0321 http://www.nrcresearchpress.com/doi/pdf/10.1139/cjfas-2015-0321 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 73, issue 12, page 1742-1749 ISSN 0706-652X 1205-7533 journal-article 2016 crcansciencepubl https://doi.org/10.1139/cjfas-2015-0321 2024-05-02T06:51:26Z We investigate how the reproductive strategy in a migratory marine fish may be influenced by spatial variations in mortality in early life stages. In particular, we examine how spawning time and location affect offspring survival and growth. A drift model for early life stages (eggs to age 1) of the Barents Sea cod (Gadus morhua) is combined with empirical estimates of spatial variation in mortality at two different life stages. We examine seasonal and interannual differences in survival and growth in offspring originating from two spawning grounds, with the central site requiring higher migration distance, and hence cost, than the northern site. When accounting for spatially explicit mortality fields, central and northern spawned offspring have about equal survival, as do early and late spawned offspring. Furthermore, central spawned offspring grow faster and are likely to reach a larger size compared with northern spawned offspring. Our results indicate that the fitness benefit of southward migration in the Barents Sea cod is not mainly due to higher early survival of offspring, but rather due to effects of offspring acquiring a larger size. Article in Journal/Newspaper Barents Sea Gadus morhua Canadian Science Publishing Canadian Journal of Fisheries and Aquatic Sciences 73 12 1742 1749 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
We investigate how the reproductive strategy in a migratory marine fish may be influenced by spatial variations in mortality in early life stages. In particular, we examine how spawning time and location affect offspring survival and growth. A drift model for early life stages (eggs to age 1) of the Barents Sea cod (Gadus morhua) is combined with empirical estimates of spatial variation in mortality at two different life stages. We examine seasonal and interannual differences in survival and growth in offspring originating from two spawning grounds, with the central site requiring higher migration distance, and hence cost, than the northern site. When accounting for spatially explicit mortality fields, central and northern spawned offspring have about equal survival, as do early and late spawned offspring. Furthermore, central spawned offspring grow faster and are likely to reach a larger size compared with northern spawned offspring. Our results indicate that the fitness benefit of southward migration in the Barents Sea cod is not mainly due to higher early survival of offspring, but rather due to effects of offspring acquiring a larger size. |
format |
Article in Journal/Newspaper |
author |
Langangen, Øystein Ottersen, Geir Ciannelli, Lorenzo Vikebø, Frode B. Stige, Leif Christian |
spellingShingle |
Langangen, Øystein Ottersen, Geir Ciannelli, Lorenzo Vikebø, Frode B. Stige, Leif Christian Reproductive strategy of a migratory fish stock: implications of spatial variations in natural mortality |
author_facet |
Langangen, Øystein Ottersen, Geir Ciannelli, Lorenzo Vikebø, Frode B. Stige, Leif Christian |
author_sort |
Langangen, Øystein |
title |
Reproductive strategy of a migratory fish stock: implications of spatial variations in natural mortality |
title_short |
Reproductive strategy of a migratory fish stock: implications of spatial variations in natural mortality |
title_full |
Reproductive strategy of a migratory fish stock: implications of spatial variations in natural mortality |
title_fullStr |
Reproductive strategy of a migratory fish stock: implications of spatial variations in natural mortality |
title_full_unstemmed |
Reproductive strategy of a migratory fish stock: implications of spatial variations in natural mortality |
title_sort |
reproductive strategy of a migratory fish stock: implications of spatial variations in natural mortality |
publisher |
Canadian Science Publishing |
publishDate |
2016 |
url |
http://dx.doi.org/10.1139/cjfas-2015-0321 http://www.nrcresearchpress.com/doi/full-xml/10.1139/cjfas-2015-0321 http://www.nrcresearchpress.com/doi/pdf/10.1139/cjfas-2015-0321 |
genre |
Barents Sea Gadus morhua |
genre_facet |
Barents Sea Gadus morhua |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 73, issue 12, page 1742-1749 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/cjfas-2015-0321 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
73 |
container_issue |
12 |
container_start_page |
1742 |
op_container_end_page |
1749 |
_version_ |
1799477540565286912 |