Otolith chemistry indicates population structuring by the Antarctic Circumpolar Current

Ashford, Julian R. and Jones, Cynthia M. and Hofmann, Eileen E. and Everson, Inigo and Moreno, Carlos A. and Duhamel, Guy and Williams, Richard (2011) Otolith chemistry indicates population structuring by the Antarctic Circumpolar Current. Canadian Journal of Fisheries and Aquatic Sciences. ISSN 0706-652X

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Abstract

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.

Item Type: Journal Article
Additional Information: Citation: Ashford, J.R., Jones, C.M., Hofmann, E.E., Everson, I., Moreno, C.A., Duhamel, G. and Williams, R., 2011. Otolith chemistry indicates population structuring by the Antarctic Circumpolar Current. Canadian Journal of Fisheries and Aquatic Sciences, 65(2), pp.135-146..
Faculty: Faculty of Science & Technology
Depositing User: Mr I Walker
Date Deposited: 16 Sep 2013 15:24
Last Modified: 07 Jul 2016 12:51
URI: http://arro.anglia.ac.uk/id/eprint/301651

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