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RESEARCH ARTICLE

Spatial genetic subdivision among populations of the highly migratory black marlin Istiompax indica within the central Indo-Pacific

Samuel M. Williams A B E , Michael B. Bennett B , Julian G. Pepperell D , Jess A. T. Morgan A D and Jennifer R. Ovenden A B
+ Author Affiliations
- Author Affiliations

A Molecular Fisheries Laboratory, The University of Queensland, St Lucia, Qld 4072, Australia.

B School of Biomedical Sciences, The University of Queensland, St Lucia, Qld 4072, Australia.

C Pepperell Research and Consulting Pty Ltd, PO Box 1475, Noosaville DC, Qld 4566, Australia.

D Queensland Alliance for Agriculture and Food Innovation, the University of Queensland, St Lucia, Qld 4069, Australia.

E Corresponding author. Email: samuel.williams5@uq.net.au

Marine and Freshwater Research 67(8) 1205-1214 https://doi.org/10.1071/MF14370
Submitted: 18 November 2014  Accepted: 20 April 2015   Published: 7 September 2015

Abstract

The black marlin Istiompax indica is a highly migratory species and as a result is expected to show little genetic population structure throughout its broad geographic range. Tissue samples from 183 I. indica were collected from three geographic regions within the central Indo-Pacific and analysed using mitochondrial and nuclear DNA markers. Nuclear genetic heterogeneity was found among populations in the south-western Pacific Ocean, eastern Indian Ocean and South China Sea (significant FST values of 0.013–0.037). Combining information from nuclear markers with published movement and reproductive data suggests that reproductive philopatry plays a role in maintaining contemporary I. indica population structure. Analyses of the mitochondrial control region did not reflect this pattern; however, it identified historical population structure. Differing patterns of genetic population structure revealed by mitochondrial and nuclear markers demonstrated that a transition must have occurred between historical and contemporary population structures. This restructuring presumably reflects a species whose populations have become genetically isolated before experiencing a period of secondary contact. The spatial subdivision evident among populations indicates that I. indica in this central Indo-Pacific region should be managed as three independent stocks, to guide the sustainability of this fisheries resource.

Additional keywords: billfish, citizen science, fisheries management, philopatry, population structure.


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