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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ftangliruskinfig:oai:figshare.com:article/23773743 2023-11-12T04:08:21+01:00 Otolith chemistry indicates population structuring by the Antarctic Circumpolar Current Julian R. Ashford Cynthia M. Jones Eileen E. Hofmann Inigo Everson Carlos A. Moreno Guy Duhamel Richard Williams 2008-02-01T00:00:00Z https://figshare.com/articles/journal_contribution/Otolith_chemistry_indicates_population_structuring_by_the_Antarctic_Circumpolar_Current/23773743 unknown 10779/aru.23773743.v1 https://figshare.com/articles/journal_contribution/Otolith_chemistry_indicates_population_structuring_by_the_Antarctic_Circumpolar_Current/23773743 CC BY 4.0 research Text Journal contribution 2008 ftangliruskinfig 2023-10-13T12:23:13Z 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 Anglia Ruskin University: Figshare Antarctic Southern Ocean The Antarctic |
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Anglia Ruskin University: Figshare |
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research Julian R. Ashford Cynthia M. Jones Eileen E. Hofmann Inigo Everson Carlos A. Moreno Guy Duhamel Richard Williams Otolith chemistry indicates population structuring by the Antarctic Circumpolar Current |
topic_facet |
research |
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 |
Julian R. Ashford Cynthia M. Jones Eileen E. Hofmann Inigo Everson Carlos A. Moreno Guy Duhamel Richard Williams |
author_facet |
Julian R. Ashford Cynthia M. Jones Eileen E. Hofmann Inigo Everson Carlos A. Moreno Guy Duhamel Richard Williams |
author_sort |
Julian R. Ashford |
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 |
publishDate |
2008 |
url |
https://figshare.com/articles/journal_contribution/Otolith_chemistry_indicates_population_structuring_by_the_Antarctic_Circumpolar_Current/23773743 |
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_relation |
10779/aru.23773743.v1 https://figshare.com/articles/journal_contribution/Otolith_chemistry_indicates_population_structuring_by_the_Antarctic_Circumpolar_Current/23773743 |
op_rights |
CC BY 4.0 |
_version_ |
1782328671772606464 |