Historical Changes in Genotypic Frequencies at the Pantophysin Locus in Atlantic Cod (Gadus Morhua) in Icelandic Waters: Evidence of Fisheries-induced Selection?

Overview

Journal Evol Appl

Specialty Biology

Date 2015 Jan 9

PMID 25568005

Citations 16

Authors

Klara B Jakobsdottir

Heidi Pardoe

Arni Magnusson

Hoskuldur Bjornsson

Christophe Pampoulie

Daniel E Ruzzante

Gudrun Marteinsdottir

Affiliations

Soon will be listed here.

Abstract

The intense fishing mortality imposed on Atlantic cod in Icelandic waters during recent decades has resulted in marked changes in stock abundance, as well as in age and size composition. Using a molecular marker known to be under selection (Pan I) along with a suite of six neutral microsatellite loci, we analysed an archived data set and revealed evidence of distinct temporal changes in the frequencies of genotypes at the Pan I locus among spawning Icelandic cod, collected between 1948 and 2002, a period characterized by high fishing pressure. Concurrently, temporal stability in the composition of the microsatellite loci was established within the same data set. The frequency of the Pan I(BB) genotype decreased over a period of six decades, concomitant with considerable spatial and technical changes in fishing effort that resulted in the disappearance of older individuals from the fishable stock. Consequently, these changes have likely led to a change in the genotype frequencies at this locus in the spawning stock of Icelandic cod. The study highlights the value of molecular genetic approaches that combine functional and neutral markers examined in the same set of individuals for investigations of the selective effects of harvesting and reiterates the need for an evolutionary dimension to fisheries management.

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