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

Söffker, Marta ORCID: https://orcid.org/0000-0002-7131-5486, Hollyman, Philip, Collins, Martin A., Hogg, Oliver, Riley, Ainsley, Laptikhovsky, Vladimir V., Earl, Timothy, Roberts, Jim, MacLeod, Eleanor, Belchier, Mark and 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. ISSN 0967-0645

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Abstract

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:	Article
Uncontrolled Keywords:	patagonian toothfish,antarctic toothfish,dissostichus,south sandwich islands,life history,range edge distribution,sdg 14 - life below water ,/dk/atira/pure/sustainabledevelopmentgoals/life_below_water
Faculty \ School:	Faculty of Science > School of Environmental Sciences
UEA Research Groups:	Faculty of Science > Research Groups > Collaborative Centre for Sustainable Use of the Seas
Depositing User:	LivePure Connector
Date Deposited:	13 Oct 2022 14:31
Last Modified:	07 Oct 2023 01:14
URI:	https://ueaeprints.uea.ac.uk/id/eprint/89058
DOI:	10.1016/j.dsr2.2022.105098

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