Population genetic structure and demographic history of Pacific blue sharks (Prionace glauca) inferred from mitochondrial DNA analysis
Mioko Taguchi A C , Jacquelynne R. King B , Michael Wetklo B , Ruth E. Withler B and Kotaro Yokawa A
+ Author Affiliations
- Author Affiliations
A National Research Institute of Far Seas Fisheries, Shimizu, Shizuoka 424-8633, Japan.
B Pacific Biological Station, Fisheries and Oceans Canada, Nanaimo, BC, V9T 6N7, Canada.
C Corresponding author. Email: miokotaguchi@gmail.com
Marine and Freshwater Research 66(3) 267-275 https://doi.org/10.1071/MF14075
Submitted: 12 July 2013 Accepted: 13 June 2014 Published: 6 November 2014
Abstract
Cosmopolitan pelagic species often show shallow genetic divergence and weak, or no, genetic structure across a species’ range. However, there have been few such genetic studies for pelagic sharks. The pelagic blue shark (Prionace glauca) has a broad circumglobal distribution in tropical and temperate oceans. To investigate the population genetic structure and demographic history of this species, we analysed variation in the mitochondrial cytochrome b sequence for a total of 404 specimens collected from 10 locations across the Indo-Pacific region. The observed genetic diversities were comparable among sampling locations (h = 0.77–0.87; π = 0.17–0.23%). Spatial analysis of molecular variance (SAMOVA), pairwise ΦST and conventional FST estimates, and analysis of isolation with migration indicated weak or no genetic differentiation of this species across the Indo-Pacific region. The results of three phylogeographic analyses (i.e. mismatch distribution and parsimony haplotype network analyses and a neutrality test) suggested that the Pacific blue shark had historically experienced a sudden population expansion. These results, coupled with the biological properties of this species, imply that historical climate fluctuation has had only a minor effect on the genetic structuring of the blue shark.
Additional keywords: Carcharhinidae, climate change, highly mobile fishes, open ocean.
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