Contrasting life-history traits of two toothfish (Dissostichus spp.) species at their range edge around the South Sandwich Islands

Soeffker, Marta; Hollyman, Philip R. ORCID: https://orcid.org/0000-0003-2665-5075; Collins, Martin A. ORCID: https://orcid.org/0000-0001-7132-8650; Hogg, Oliver T.; Riley, Ainsley; Laptikhovsky, Vladimir; Earl, Timothy; Roberts, Jim; MacLeod, Eleanor; Belchier, Mark; Darby, Chris. 2022 Contrasting life-history traits of two toothfish (Dissostichus spp.) species at their range edge around the South Sandwich Islands. Deep Sea Research Part II: Topical Studies in Oceanography, 201, 105098. https://doi.org/10.1016/j.dsr2.2022.105098

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Official URL: http://dx.doi.org/10.1016/j.dsr2.2022.105098

Abstract/Summary

The South Sandwich Islands (SSI), a chain of volcanic islands in the Atlantic sector of the Southern Ocean, are home to two large notothenoid species: the Patagonian toothfish Dissostichus eleginoides and the Antarctic toothfish Dissostichus mawsoni. Both species support valuable fisheries throughout the Southern Ocean under management of the Commission for the Conservation of Antarctic Marine Living Resources (CCAMLR). The SSI region, which is located south of the Southern Antarctic Circumpolar Current Front, has a diverse and distinct biodiversity and it represents a range edge for the distribution of both toothfish species. In this paper we have updated and expanded previous biological analyses with recent data, explored the stock hypotheses and links of these species to other regions, and investigated the role of the SSI archipelago in the life cycles of both toothfish species, where they overlap in their distribution. We conclude that Patagonian toothfish around the SSI are linked to the adjacent South Georgia population, but have some unique characteristics, including faster growth and better somatic condition, possibly reflecting ‘Bergmann's rule’ which states that body size increases with decreasing temperature and increasing latitude. By comparison, the Antarctic toothfish at the SSI appear to be the northern extent of a larger stock connecting further south towards the Antarctic continent. Finally, we consider the relative importance of the SSI in the life cycle of both species, including in the context of climatic changes to this region.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.1016/j.dsr2.2022.105098
ISSN:	09670645
Additional Keywords:	Patagonian toothfish, Antarctic toothfish, Dissostichus spp. South Sandwich Islands, Life history, Range edge distribution
Date made live:	13 Jul 2022 12:38 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/532903

Item Type:

Publication - Article

Digital Object Identifier (DOI):

https://doi.org/10.1016/j.dsr2.2022.105098

ISSN:

09670645

Additional Keywords:

Patagonian toothfish, Antarctic toothfish, Dissostichus spp. South Sandwich Islands, Life history, Range edge distribution

Date made live:

13 Jul 2022 12:38 +0 (UTC)

URI:

https://nora.nerc.ac.uk/id/eprint/532903