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Marine and Freshwater Research Marine and Freshwater Research Society
Advances in the aquatic sciences
RESEARCH ARTICLE

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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