Otolith chemistry indicates population structuring by the Antarctic Circumpolar Current
Large-scale transport of seawater in ocean currents may generate spatially complex population structure through the advection of life stages of marine fish species. To test this, we compared the chemistry of otolith nuclei from Patagonian toothfish (Dissostichus eleginoides), presently managed as sp...
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crcansciencepubl:10.1139/f07-158 2024-06-23T07:47:23+00:00 Otolith chemistry indicates population structuring by the Antarctic Circumpolar Current Ashford, Julian R Jones, Cynthia M Hofmann, Eileen E Everson, Inigo Moreno, Carlos A Duhamel, Guy Williams, Richard 2008 http://dx.doi.org/10.1139/f07-158 http://www.nrcresearchpress.com/doi/pdf/10.1139/f07-158 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 65, issue 2, page 135-146 ISSN 0706-652X 1205-7533 journal-article 2008 crcansciencepubl https://doi.org/10.1139/f07-158 2024-06-06T04:11:15Z Large-scale transport of seawater in ocean currents may generate spatially complex population structure through the advection of life stages of marine fish species. To test this, we compared the chemistry of otolith nuclei from Patagonian toothfish (Dissostichus eleginoides), presently managed as spatially discrete populations corresponding to fishing management areas along the Antarctic Circumpolar Current (ACC), which transports water eastward around the Southern Ocean. The chemistry of otolith nuclei, laid down during early life, differed significantly between fishing areas off South America and the Antarctic and between some Antarctic areas. However, we found significant discrepancies from expectation for a population structure corresponding to fishing areas. We also found evidence of four groups of fish with different early life chemistry: one associated with South America and three Antarctic groups showing mixing consistent with advective transport along the ACC. These results suggest that toothfish populations are structured by their physical environment; population abundance and persistence may rely on a restricted number of breeding members with access to spawning grounds, whereas fisheries may rely substantially on nonbreeding vagrants transported from fishing areas upstream. Article in Journal/Newspaper Antarc* Antarctic Patagonian Toothfish Southern Ocean Canadian Science Publishing Antarctic Southern Ocean The Antarctic Canadian Journal of Fisheries and Aquatic Sciences 65 2 135 146 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
Large-scale transport of seawater in ocean currents may generate spatially complex population structure through the advection of life stages of marine fish species. To test this, we compared the chemistry of otolith nuclei from Patagonian toothfish (Dissostichus eleginoides), presently managed as spatially discrete populations corresponding to fishing management areas along the Antarctic Circumpolar Current (ACC), which transports water eastward around the Southern Ocean. The chemistry of otolith nuclei, laid down during early life, differed significantly between fishing areas off South America and the Antarctic and between some Antarctic areas. However, we found significant discrepancies from expectation for a population structure corresponding to fishing areas. We also found evidence of four groups of fish with different early life chemistry: one associated with South America and three Antarctic groups showing mixing consistent with advective transport along the ACC. These results suggest that toothfish populations are structured by their physical environment; population abundance and persistence may rely on a restricted number of breeding members with access to spawning grounds, whereas fisheries may rely substantially on nonbreeding vagrants transported from fishing areas upstream. |
format |
Article in Journal/Newspaper |
author |
Ashford, Julian R Jones, Cynthia M Hofmann, Eileen E Everson, Inigo Moreno, Carlos A Duhamel, Guy Williams, Richard |
spellingShingle |
Ashford, Julian R Jones, Cynthia M Hofmann, Eileen E Everson, Inigo Moreno, Carlos A Duhamel, Guy Williams, Richard Otolith chemistry indicates population structuring by the Antarctic Circumpolar Current |
author_facet |
Ashford, Julian R Jones, Cynthia M Hofmann, Eileen E Everson, Inigo Moreno, Carlos A Duhamel, Guy Williams, Richard |
author_sort |
Ashford, Julian R |
title |
Otolith chemistry indicates population structuring by the Antarctic Circumpolar Current |
title_short |
Otolith chemistry indicates population structuring by the Antarctic Circumpolar Current |
title_full |
Otolith chemistry indicates population structuring by the Antarctic Circumpolar Current |
title_fullStr |
Otolith chemistry indicates population structuring by the Antarctic Circumpolar Current |
title_full_unstemmed |
Otolith chemistry indicates population structuring by the Antarctic Circumpolar Current |
title_sort |
otolith chemistry indicates population structuring by the antarctic circumpolar current |
publisher |
Canadian Science Publishing |
publishDate |
2008 |
url |
http://dx.doi.org/10.1139/f07-158 http://www.nrcresearchpress.com/doi/pdf/10.1139/f07-158 |
geographic |
Antarctic Southern Ocean The Antarctic |
geographic_facet |
Antarctic Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Patagonian Toothfish Southern Ocean |
genre_facet |
Antarc* Antarctic Patagonian Toothfish Southern Ocean |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 65, issue 2, page 135-146 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f07-158 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
65 |
container_issue |
2 |
container_start_page |
135 |
op_container_end_page |
146 |
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1802651474375737344 |