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The genetic structure of a marine teleost, Chrysophrys auratus, in a large, heterogeneous marine embayment

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Abstract

There is considerable interest in the processes that generate genetic divergence in marine species and the spatial and temporal scales over which these processes operate. Shark Bay, a large embayment (~13,000 km2) on the arid west coast of Australia, has been described as a focal point for genetic divergence in marine species due to its heterogeneous environment. This study represents the first DNA-based analysis of the genetic structure of a marine species with pelagic early life stages (ELS) in this region. Twelve microsatellite loci were used to compare the genetic composition of the teleost Chrysophrys auratus from five areas within Shark Bay, and from near-by shelf waters approximately 250 km to the south. The results suggest that the microsatellite composition of C. auratus is homogeneous across most of Shark Bay and near-by shelf waters. This genetic homogeneity is probably maintained via small amounts of contemporary gene flow, which may reduce the potential for C. auratus to locally adapt to the Shark Bay environment. A weakly differentiated assemblage in Freycinet Estuary in the Western Gulf of Shark Bay provided an important exception to the otherwise homogeneous microsatellite composition of C. auratus in the study area. This weak differentiation probably reflects restrictions to gene flow into and/or out of this site due to the temporal isolation of breeding adults, selective mortality of immigrants and/or the presence of hydrological barriers to larval transport. Each of these factors can be linked to environmental heterogeneity in Shark Bay.

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Acknowledgements

This research was funded by the Western Australian Marine Science Institute (WAMSI), under Node 4: Fisheries Ecosystems, Project 4.4: Captured Species Assessments, and Murdoch University. M. Gardner was supported by an Australian Postgraduate Award while conducting the research. We thank staff of the Department of Primary Industries and Regional Development, Fisheries WA, particularly Jeffrey Norriss, for sample collection. We also thank Frances Brigg (SABC, Murdoch University) for advice about fragment analysis and operating the ABI3730. The authors declare that they have no conflict of interest. All samples were obtained according to Australian legislation and all required ethical permissions were obtained. We thank several reviewers for constructive comments on earlier versions of the manuscript.

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  1. Centre for Fish and Fisheries Research, Murdoch University, 90 South St, Murdoch, WA, 6150, Australia

    M. J. Gardner, J. A. Chaplin, I. Potter & D. V. Fairclough

  2. Department of Primary Industries and Regional Development, Fisheries Division , Hillarys, WA, 6025, Australia

    D. V. Fairclough & G. Jackson

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  1. M. J. Gardner
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Correspondence to M. J. Gardner.

Appendix

Appendix

Table 4 Number of individuals scored (N), number of alleles detected (A), number of alleles standardised to the smallest sample size (A S), expected heterozygosity (He), observed heterozygosity (Ho), and the probability of incorrectly rejecting the null hypothesis (no difference between the observed genotype numbers and those expected under Hardy-Weinberg equilibrium conditions) (P), for 12 microsatellite loci for samples of Chrysophrys auratus from five locations within Shark Bay and Kalbarri
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Gardner, M.J., Chaplin, J.A., Potter, I. et al. The genetic structure of a marine teleost, Chrysophrys auratus, in a large, heterogeneous marine embayment. Environ Biol Fish 100, 1411–1425 (2017). https://doi.org/10.1007/s10641-017-0652-8

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