Comments on local cod (Gadus morhua) revealed by egg surveys and population genetic analysis after longstanding depletion on the Swedish Skagerrak Coast by Svedäng et al

Cardinale, M ORCID: https://orcid.org/0000-0003-1870-3882, Mariani, S ORCID: https://orcid.org/0000-0002-5329-0553 and Hjelm, J 2019, 'Comments on local cod (Gadus morhua) revealed by egg surveys and population genetic analysis after longstanding depletion on the Swedish Skagerrak Coast by Svedäng et al' , ICES Journal of Marine Science, 76 (4) , pp. 1209-1211.

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Abstract

Abstract Svedäng et al. (2018) concluded that “the occurrence of locally spawned cod eggs suggests that spawning on the Swedish Skagerrak coast takes place, which belong to either a coastal subpopulation that is a remnant stock of a once much larger cod population, or a newly formed subpopulation that is now successfully inhabiting the coastal ecosystems along the Swedish Skagerrak coast”. However, after carefully reviewing the results and the data presented by the authors, we were no longer convinced that the information presented provided enough evidence for a local, distinct, coastal cod population in the Swedish Skagerrak. Thus, we requested the original genotype data, which the authors kindly provided to us. This allowed us to explore the substructure of these samples further using STRUCTURE 2.3.2. Re-analysis of the data consistently rejects the existence of an independent coastal Swedish stock in contrast with Svedäng et al. (2018) conclusions. We acknowledge the observation of cod spawning in the area but, based on re-analysis of the original genetic data of Svedäng et al. (2018), we currently lack the scientific basis to assume the existence of established local stocks, and even less the demographic expansion of an older, relict population in the area.

Item Type: Article
Additional Information: ** Article version: VoR ** From Crossref via Jisc Publications Router **Journal IDs: pissn 1054-3139; eissn 1095-9289 **History: published 01-07-2019; issued 03-06-2019; published_online 03-06-2019 **License for this article: starting on 03-06-2019, , https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model
Uncontrolled Keywords: Ecology, Aquatic Science, Ecology, Evolution, Behavior and Systematics, Oceanography
Schools: Schools > School of Environment and Life Sciences
Journal or Publication Title: ICES Journal of Marine Science
Publisher: Oxford University Press (OUP)
ISSN: 1054-3139
Related URLs:
SWORD Depositor: Publications Router
Depositing User: Publications Router
Date Deposited: 16 Dec 2019 09:20
Last Modified: 16 Dec 2019 09:20
URI: http://usir.salford.ac.uk/id/eprint/56036

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