Population structure in a wide-ranging coastal teleost (Argyrosomus japonicus, Sciaenidae) reflects marine biogeography across southern Australia
Thomas C. Barnes A G , Claudia Junge A , Steven A. Myers A , Mathew D. Taylor B C , Paul J. Rogers D , Greg J. Ferguson D , Jason A. Lieschke E , Stephen C. Donnellan F and Bronwyn M. Gillanders A
+ Author Affiliations
- Author Affiliations
A Southern Seas Ecology Laboratories, Darling Building, School of Biological Sciences and Environment Institute, University of Adelaide, SA 5005, Australia.
B School of Biological, Earth and Environmental Science, University of New South Wales, Sydney, NSW 2052, Australia.
C Port Stephens Fisheries Institute, New South Wales Department of Primary Industries, Taylors Beach, NSW 2316, Australia.
D South Australian Research and Development Institute (Aquatic Sciences), PO Box 120, Henley Beach, SA 5024, Australia.
E Arthur Rylah Institute for Environmental Research, Department of Environment, Land, Water and Planning, 123 Brown Street, Heidelberg, Vic. 3084, Australia.
F South Australian Museum, North Terrace, Adelaide, SA 5000, Australia.
G Corresponding author. Email: thomas.barnes@adelaide.edu.au
Marine and Freshwater Research 67(8) 1103-1113 https://doi.org/10.1071/MF15044
Submitted: 3 February 2015 Accepted: 6 June 2015 Published: 10 September 2015
Abstract
Population structure in marine teleosts is often investigated to aid conservation and fisheries management (e.g. to assess population structure to inform restocking programs). We assessed genetic population structure of the important estuary-associated marine fish, mulloway (Argyrosomus japonicus), within Australian waters and between Australia and South Africa. Genetic variation was investigated at 13 polymorphic microsatellite markers. FST values and Bayesian estimates in STRUCTURE suggested population differentiation of mulloway within Australia and confirm strong differentiation between South Africa and Australia. The 12 Australian sample sets fell into one of four spatially separated genetic clusters. Initially, a significant signal of isolation-by-distance (IBD) was evident among Australian populations. However, further investigation by decomposed-pairwise-regression (DPR) suggested five sample sets were influenced more by genetic-drift, rather than gene-flow and drift equilibrium, as expected in strong IBD cases. Cryptic oceanographic and topographical influences may isolate mulloway populations from south-western Australia. The results demonstrate that DPR is suitable to assess population structure of coastal marine species where barriers to gene flow may be less obvious than in freshwater systems. Information on the relative strengths of gene flow and genetic drift facilitates a more comprehensive understanding of the evolutionary forces that lead to population structure, which in turn informs fisheries and assists conservation management. Large-bodied predatory scale-fish may be under increasing pressure on a global scale, owing to a variety of anthropogenic reasons. In southern Australia, the iconic sciaenid A. japonicus (mulloway, jewfish or kob) is no exception. Despite the species supporting important fisheries, much of its ecology is poorly understood. It is possible that a greater understanding of their genetic population structure can help ensure a sustainable future for the only southern Australian sciaenid.
Additional keywords: jewfish, kob, population genetics.
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