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- Title
Historical analysis of Pan I in Atlantic cod (Gadus morhua): temporal stability of allele frequencies in the southeastern part of the species distribution.
- Authors
Nielsen, Einar Eg; MacKenzie, Brian R; Magnussen, Eydfinn; Meldrup, Dorte
- Abstract
We investigated temporal genetic differentiation at the pantophysin (Pan I) locus in four Atlantic cod (Gadus morhua) populations from the southeastern part of the species distribution: the Baltic Sea, the North Sea, the Faroe Plateau, and the Faroe Bank. Historical otolith collections enabled investigation of allele frequency variation over time periods up to 69 years employing Pan I primers specifically designed for partially degraded DNA. Small and nonsignificant temporal changes in Pan I allele frequencies were observed in the four populations. Simultaneous microsatellite analysis revealed similar temporal genetic stability with temporal FST values ranging from 0 to 0.006, suggesting limited demographic changes. Sea surface temperature, which has been suggested as the primary driver for the geographical distribution of Pan I alleles in cod, showed no long-term trend although temperature has increased since the mid-1990s. Our study demonstrates that populations in the southeastern part of the species range has been characterized by very high frequencies of the Pan IA allele for many decades, and accordingly, Pan I serves as a reliable marker for genetic stock identification on a macrogeographical scale.
- Subjects
NORTH Sea; BALTIC Sea; ATLANTIC cod; FISH populations; GENETIC stock identification of fishes; FISH genetics; PHYSIOLOGICAL effects of water temperature
- Publication
Canadian Journal of Fisheries & Aquatic Sciences, 2007, Vol 64, Issue 10, p1448
- ISSN
0706-652X
- Publication type
Article
- DOI
10.1139/f07-104