Historical analysis of Pan I in Atlantic cod (Gadus morhua): temporal stability of allele frequencies in the southeastern part of the species distribution

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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.

Nous étudions la différenciation génétique au locus Pan I chez quatre populations de morues franche (Gadus morhua) du sud-est de l’aire de répartition de l’espèce, soit celles de la Baltique, de la Mer du Nord, du plateau de Féroé et du banc de Féroé. Des collections historiques d’otolithes ont permis d’analyser la variation de la fréquence des allèles sur des périodes pouvant atteindre 69 ans à l’aide d’amorces Pan I spécialement conçues pour l’ADN partiellement dégradé. Nous observons des changements temporels faibles et non significatifs dans la fréquence des allèles de Pan I dans les quatre populations. Des analyses simultanées des microsatellites montrent aussi une stabilité génétique temporelle, les valeurs temporelles de FST variant de 0–0,006, ce qui indique de faibles changements démographiques. La température de surface de la mer, qu’on a suggéré comme principal facteur explicatif de la répartition géographique des allèles de Pan I chez la morue, ne montre aucune tendance à long terme, bien que la température ait augmenté depuis le milieu des années 1990. Notre étude démontre que les populations du sud-est de l’aire de répartition de l’espèce sont caractérisées depuis plusieurs décennies par de hautes fréquences de l’allèle Pan IA; c’est pourquoi Pan I peut servir de marqueur fiable de l’identification génétique des stocks à l’échelle macrogéographique.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: October 1, 2007

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  • Published continuously since 1901 (under various titles), this monthly journal is the primary publishing vehicle for the multidisciplinary field of aquatic sciences. It publishes perspectives (syntheses, critiques, and re-evaluations), discussions (comments and replies), articles, and rapid communications, relating to current research on cells, organisms, populations, ecosystems, or processes that affect aquatic systems. The journal seeks to amplify, modify, question, or redirect accumulated knowledge in the field of fisheries and aquatic science. Occasional supplements are dedicated to single topics or to proceedings of international symposia.
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