Preliminary observations of population genetics and relatedness of the broadnose sevengill shark, Notorynchus cepedianus, in two northeast Pacific estuaries

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Larson, S., Farrer, D., Lowry, D., & Ebert, D. A. (2015). Preliminary observations of population genetics and relatedness of the broadnose sevengill shark, Notorynchus cepedianus, in two northeast Pacific estuaries. PLoS ONE, 10(6). doi:10.1371/journal.pone.0129278
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TitlePreliminary observations of population genetics and relatedness of the broadnose sevengill shark, Notorynchus cepedianus, in two northeast Pacific estuaries
AuthorsS. Larson, D. Farrer, D. Lowry, D. Ebert
AbstractThe broadnose sevengill shark, Notorynchus cepedianus, a common coastal species in the eastern North Pacific, was sampled during routine capture and tagging operations conducted from 2005-2012. One hundred and thirty three biopsy samples were taken during these research operations in Willapa Bay, Washington and in San Francisco Bay, California. Genotypic data from seven polymorphic microsatellites (derived from the related sixgill shark, Hexanchus griseus) were used to describe N. cepedianus genetic diversity, population structure and relatedness. Diversity within N. cepedianus was found to be low to moderate with an average observed heterozygosity of 0.41, expected heterozygosity of 0.53, and an average of 5.1 alleles per microsatellite locus. There was no evidence of a recent population bottleneck based on genetic data. Analyses of genetic differences between the two sampled estuaries suggest two distinct populations with some genetic mixing of sharks sampled during 2005-2006. Relatedness within sampled populations was high, with percent relatedness among sharks caught in the same area indicating 42.30% first-order relative relationships (full or half siblings). Estuary-specific familial relationships suggest that management of N. cepedianus on the U.S. West Coast should incorporate stock-specific management goals to conserve this ecologically important predator. © 2015 Larson et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
JournalPLoS ONE
Date2015
Volume10
Issue6
ISSN1932-6203
NoteExport Date: 24 July 2015

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