Ecological and genetic impact of Atlantic cod larval drift in the Skagerrak

Nils Chr Stenseth; Per Erik Jorde; Kung-Sik Chan; Elizabeth Hansen; Halvor Knutsen; Carl André; Morten D Skogen; Kyrre Lekve

doi:10.1098/rspb.2005.3290

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Ecological and genetic impact of Atlantic cod larval drift in the Skagerrak

Journal article

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Ecological and genetic impact of Atlantic cod larval drift in the Skagerrak

Nils Chr Stenseth, Per Erik Jorde, Kung-Sik Chan, Elizabeth Hansen, Halvor Knutsen, Carl André, Morten D Skogen and Kyrre Lekve

Proceedings of the Royal Society. B, Biological sciences, Vol.273(1590), pp.1085-1092

05/07/2006

DOI: 10.1098/rspb.2005.3290

PMCID: PMC1560253

PMID: 16600885

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Abstract

We evaluate the hypothesis that Atlantic cod larvae are passively transported by sea currents from off-shore spawning areas to settle in coastal waters, a hypothesis which has recently gained support from genetic analysis of cod in the North Sea-Skagerrak area. Such larval transport has been suggested to be an important mechanism behind the commonly observed low spatial genetic differentiation in many marine organisms. Here, we apply an ARMAX(2,2) model for juvenile abundance and use long-term monitoring data from the Skagerrak coast, constituting 54 continuous annual series from 1945 to 1997. Analysing the model, we find that the product of the size of the North Sea breeding stock and the strength of the net inflow of North Sea waters had a significant, positive effect on the abundance of coastal juvenile cod. The peak effect occurs during the month of March, just after spawning, when eggs and larvae remain pelagic and sensitive to currents. In contrast, we find no evidence of any direct effect of the North Sea spawning stock alone. Our analyses indicate that 15-20 000 0-group larvae from the North Sea reach each fjord per year, on average. This corresponds to about 1-10% of the total 0-group population in each fjord on average. These findings clearly demonstrate a direct link between larval drift and gene flow in the marine environment.

Atlantic cod (Gadus morhua)

ecological dynamics

genetic differentiation

larval drift

time series modelling

Details

Title: Subtitle: Ecological and genetic impact of Atlantic cod larval drift in the Skagerrak
Creators: Nils Chr Stenseth - University of Oslo
Per Erik Jorde - University of Oslo
Kung-Sik Chan - University of Iowa
Elizabeth Hansen - University of Iowa
Halvor Knutsen - University of Oslo
Carl André - Marine Biological Laboratory
Morten D Skogen - Institute of Marine Research
Kyrre Lekve - University of Oslo
Resource Type: Journal article
Publication Details: Proceedings of the Royal Society. B, Biological sciences, Vol.273(1590), pp.1085-1092
DOI: 10.1098/rspb.2005.3290
PMID: 16600885
PMCID: PMC1560253
NLM abbreviation: Proc Biol Sci
ISSN: 0962-8452
eISSN: 1471-2954
Publisher: The Royal Society
Language: English
Date published: 05/07/2006
Academic Unit: Statistics and Actuarial Science; Radiology
Record Identifier: 9984257737702771

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