Frequent skipped spawning in the world’s largest cod population
Life-history theory suggests that animals may skip reproductive events after initial maturation to maximize lifetime fitness. In iteroparous teleosts, verifying past spawning history is particularly difficult; the degree of skipped spawning at the population level therefore remains unknown. We unequ...
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Online Access: | http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3384173 http://www.ncbi.nlm.nih.gov/pubmed/22615381 https://doi.org/10.1073/pnas.1200223109 |
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ftpubmed:oai:pubmedcentral.nih.gov:3384173 2023-05-15T14:30:28+02:00 Frequent skipped spawning in the world’s largest cod population Skjæraasen, Jon Egil Nash, Richard D. M. Korsbrekke, Knut Fonn, Merete Nilsen, Trygve Kennedy, James Nedreaas, Kjell H. Thorsen, Anders Witthames, Peter R. Geffen, Audrey J. Høie, Hans Kjesbu, Olav Sigurd 2012-06-05 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3384173 http://www.ncbi.nlm.nih.gov/pubmed/22615381 https://doi.org/10.1073/pnas.1200223109 en eng National Academy of Sciences http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3384173 http://www.ncbi.nlm.nih.gov/pubmed/22615381 http://dx.doi.org/10.1073/pnas.1200223109 Freely available online through the PNAS open access option. Biological Sciences Text 2012 ftpubmed https://doi.org/10.1073/pnas.1200223109 2013-09-04T09:18:32Z Life-history theory suggests that animals may skip reproductive events after initial maturation to maximize lifetime fitness. In iteroparous teleosts, verifying past spawning history is particularly difficult; the degree of skipped spawning at the population level therefore remains unknown. We unequivocally show frequent skipped spawning in Northeast Arctic cod (NEAC) in a massive field and laboratory effort from 2006 to 2008. This was verified by postovulatory follicles in temporarily arrested ovaries close to the putative spawning period. At the population level, “skippers” were estimated to be approximately equally abundant as spawning females in 2008, constituting ∼24% of the females 60–100 cm. These females never truly started vitellogenesis and principally remained on the feeding grounds when spawners migrated southward, avoiding any migration costs. The proximate cause of skipping seems to be insufficient energy to initiate oocyte development, indicating that skipped spawning may partly be a density-dependent response important in population regulation. Our data also indicate more skipping among smaller females and potential tradeoffs between current and future reproductive effort. We propose that skipped spawning is an integral life-history component for NEAC, likely varying annually, and it could therefore be an underlying factor causing some of the currently unexplained large NEAC recruitment variation. The same may hold for other teleosts. Text Arctic cod Arctic Northeast Arctic cod PubMed Central (PMC) Arctic Proceedings of the National Academy of Sciences 109 23 8995 8999 |
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English |
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Biological Sciences |
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Biological Sciences Skjæraasen, Jon Egil Nash, Richard D. M. Korsbrekke, Knut Fonn, Merete Nilsen, Trygve Kennedy, James Nedreaas, Kjell H. Thorsen, Anders Witthames, Peter R. Geffen, Audrey J. Høie, Hans Kjesbu, Olav Sigurd Frequent skipped spawning in the world’s largest cod population |
topic_facet |
Biological Sciences |
description |
Life-history theory suggests that animals may skip reproductive events after initial maturation to maximize lifetime fitness. In iteroparous teleosts, verifying past spawning history is particularly difficult; the degree of skipped spawning at the population level therefore remains unknown. We unequivocally show frequent skipped spawning in Northeast Arctic cod (NEAC) in a massive field and laboratory effort from 2006 to 2008. This was verified by postovulatory follicles in temporarily arrested ovaries close to the putative spawning period. At the population level, “skippers” were estimated to be approximately equally abundant as spawning females in 2008, constituting ∼24% of the females 60–100 cm. These females never truly started vitellogenesis and principally remained on the feeding grounds when spawners migrated southward, avoiding any migration costs. The proximate cause of skipping seems to be insufficient energy to initiate oocyte development, indicating that skipped spawning may partly be a density-dependent response important in population regulation. Our data also indicate more skipping among smaller females and potential tradeoffs between current and future reproductive effort. We propose that skipped spawning is an integral life-history component for NEAC, likely varying annually, and it could therefore be an underlying factor causing some of the currently unexplained large NEAC recruitment variation. The same may hold for other teleosts. |
format |
Text |
author |
Skjæraasen, Jon Egil Nash, Richard D. M. Korsbrekke, Knut Fonn, Merete Nilsen, Trygve Kennedy, James Nedreaas, Kjell H. Thorsen, Anders Witthames, Peter R. Geffen, Audrey J. Høie, Hans Kjesbu, Olav Sigurd |
author_facet |
Skjæraasen, Jon Egil Nash, Richard D. M. Korsbrekke, Knut Fonn, Merete Nilsen, Trygve Kennedy, James Nedreaas, Kjell H. Thorsen, Anders Witthames, Peter R. Geffen, Audrey J. Høie, Hans Kjesbu, Olav Sigurd |
author_sort |
Skjæraasen, Jon Egil |
title |
Frequent skipped spawning in the world’s largest cod population |
title_short |
Frequent skipped spawning in the world’s largest cod population |
title_full |
Frequent skipped spawning in the world’s largest cod population |
title_fullStr |
Frequent skipped spawning in the world’s largest cod population |
title_full_unstemmed |
Frequent skipped spawning in the world’s largest cod population |
title_sort |
frequent skipped spawning in the world’s largest cod population |
publisher |
National Academy of Sciences |
publishDate |
2012 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3384173 http://www.ncbi.nlm.nih.gov/pubmed/22615381 https://doi.org/10.1073/pnas.1200223109 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic cod Arctic Northeast Arctic cod |
genre_facet |
Arctic cod Arctic Northeast Arctic cod |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3384173 http://www.ncbi.nlm.nih.gov/pubmed/22615381 http://dx.doi.org/10.1073/pnas.1200223109 |
op_rights |
Freely available online through the PNAS open access option. |
op_doi |
https://doi.org/10.1073/pnas.1200223109 |
container_title |
Proceedings of the National Academy of Sciences |
container_volume |
109 |
container_issue |
23 |
container_start_page |
8995 |
op_container_end_page |
8999 |
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1766304310434463744 |