Association between Growth and Pan I* Genotype within Atlantic Cod Full-Sibling Families
DOI: 10.1577/T05-130.1
Title: Association between Growth and Pan I* Genotype within Atlantic Cod Full-Sibling Families
Journal Title: Transactions of the American Fisheries Society
Volume: Volume 135
Issue: Issue 1
Publication Date: January 2006
Start Page: 241
End Page: 250
Published online: 9 Jan 2011
ISSN: 0002-8487
a Molecular Ecology and Fisheries Genetics Laboratory, Department of Biological Sciences , University of Hull , Hull, HU6 7RX, UK
b School of Aquatic and Fishery Sciences, University of Washington , Seattle, Washington, 98195-5020, USA
c Leibnitz Institute of Marine Sciences, University of Kiel (IFM-GEOMAR) , Düsternbrooker Weg 20, D-24105, Kiel, Germany
d Institute of Marine Research , Post Office Box 1870 Nordnes, N-5817, Bergen, Norway
e Institute of Marine Research, Fl?devigen Research Station , N-4817, His, Norway
f Danish Institute for Fisheries Research , Post Office Box 101, DK-9850, Hirtshals, Denmark
Abstract: Studies of the pantophysin (Pan I*) locus in Atlantic cod Gadus morhua and other marine gadoids indicate that the locus is under positive selection; in Atlantic cod, genotypic variation at this locus has been linked to differences in Growth. Here, we present preliminary data comparing the Growth and condition of different Atlantic cod Pan I* genotypes within families held under seminatural mesocosm conditions. Larvae from three full-sibling families carrying Pan I*bb or Pan I*ab genotypes were reared for 10 weeks in two mesocosms. Multivariate analysis of variance indicated that larvae carrying the Pan I*ab genotype exhibited significantly higher standard length, dry weight, and RNA: DNA ratio (condition factor) than did larvae that carried the Pan I*bb genotype, potentially indicating selection. The influence of linked loci cannot be excluded; indeed, the absence of a significant correlation between genotype and Growth in one family may substantiate this. The lack of differences in survival among genotypes indicates that moderate selective effects are acting primarily through size-specific mortality and fecundity. The proposed putative fitness effects, together with documented marked geographic differentiation in the wild, have implications for Atlantic cod population structure, effective migration rates, recruitment, and local adaptation, which are of particular relevance in a species threatened by continuing exploitation and rising sea temperatures.
Accepted: 23 Aug 2005

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