Genetic homogeneity of weathervane scallops ( Patinopecten caurinus ) in the northeastern Pacific

We assessed genetic differentiation among populations of weathervane scallop ( Patinopecten caurinus ) in the northeastern Pacific, extending over 2500 km in the Gulf of Alaska and southeastern Bering Sea. Variability was surveyed at nuclear loci with allozyme, microsatellite, and single nucleotide...

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Bibliographic Details
Published in:Canadian Journal of Fisheries and Aquatic Sciences
Main Authors: Gaffney, Patrick M., Pascal, Carita M., Barnhart, Jeffery, Grant, W. Stewart, Seeb, James E.
Other Authors: Vasemagi, Anti
Format: Article in Journal/Newspaper
Language:English
Published: Canadian Science Publishing 2010
Subjects:
Aquatic Science
Ecology, Evolution, Behavior and Systematics
Bering Sea
Gulf of Alaska
Pacific
Alaska
Online Access:http://dx.doi.org/10.1139/f10-096
http://www.nrcresearchpress.com/doi/full-xml/10.1139/F10-096
http://www.nrcresearchpress.com/doi/pdf/10.1139/F10-096
Description
Summary:We assessed genetic differentiation among populations of weathervane scallop ( Patinopecten caurinus ) in the northeastern Pacific, extending over 2500 km in the Gulf of Alaska and southeastern Bering Sea. Variability was surveyed at nuclear loci with allozyme, microsatellite, and single nucleotide polymorphism (SNP) methods, and at mitochondrial (mt)DNA loci with SNPs and nucleotide sequencing. High levels of gene diversity were detected for allozymes (H = 0.080), microsatellites (H = 0.734), and mtDNA (h = 0.781). Genotypes at nuclear loci generally fit Hardy–Weinberg proportions, except for some microsatellite loci, for which null-allele frequencies of 0.02 to 0.34 were estimated. No allele-frequency differences were detected among samples, except for the allozyme loci Gpi and Pep-4. Overall levels of differentiation ranged from F ST = 0.0004 for allozymes, F ST = 0.0008 for mtDNA to F ST = 0.0004 for microsatellites. No isolation by distance was found for any of the markers. A unimodal mtDNA mismatch distribution and significant excesses of low-frequency variants for allozymes, microsatellites, and mtDNA may reflect a post-glacial population expansion. The lack of genetic differentiation measured by neutral markers does not preclude the existence of locally adapted, self-sustaining populations that are important in the harvest management of this species.

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