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RESEARCH ARTICLE (Open Access)

Genomic analyses suggest strong population connectivity over large spatial scales of the commercially important baitworm, Australonuphis teres (Onuphidae)

Amanda Padovan https://orcid.org/0000-0002-8118-9137 A B I , Rowan C. Chick C , Victoria J. Cole C , Ludovic Dutoit D , Patricia A. Hutchings E F , Cameron Jack G and Ceridwen I. Fraser A H
+ Author Affiliations
- Author Affiliations

A Fenner School of Environment and Society, Building 44, Australian National University, Canberra, ACT 2601, Australia.

B CSIRO, Black Mountain Science and Innovation Park, Clunies Ross Street, Canberra, ACT 2601, Australia.

C New South Wales Department of Primary Industries, Port Stephens Fisheries Institute, Taylors Beach, NSW 2316, Australia.

D Department of Zoology, University of Otago, 340 Great King Street, Dunedin, 9016, New Zealand.

E Australian Museum Research Institute, Australian Museum, 1 William Street, Sydney, NSW 2010, Australia.

F Department of Biological Sciences, Macquarie University, North Ryde, NSW 2109, Australia.

G ANU Bioinformatics Consultancy, John Curtin School of Medical Research, Australian National University, Acton, ACT 2601, Australia.

H Department of Marine Science, University of Otago, PO Box 56, Dunedin, 9054, New Zealand.

I Corresponding author. Email: amanda.padovan@csiro.au

Marine and Freshwater Research 71(11) 1549-1556 https://doi.org/10.1071/MF20044
Submitted: 11 February 2020  Accepted: 27 April 2020   Published: 21 May 2020

Journal Compilation © CSIRO 2020 Open Access CC BY

Abstract

Barriers to dispersal can disrupt gene flow between populations, resulting in genetically distinct populations. Although many marine animals have potential for long-distance dispersal via a planktonic stage, gene flow among populations separated by large geographic distances is not always evident. Polychaetes are ecologically important and have been used as biological surrogates for marine biodiversity. Some polychaete species are used as bait for recreational fisheries, with this demand supporting commercial fisheries for polychaetes to service the retail bait market. However, despite their ecological and economic importance, very little is known about the life history or population dynamics of polychaetes, and few studies have used genetic or genomic approaches to understand polychaete population connectivity. Here, we investigate the population structure of one commonly collected beachworm species used for bait on the eastern coast of Australia, namely, Australonuphis teres, by using genome-wide single-nucleotide polymorphism data. We sampled A. teres from hierarchical nested spatial scales along 900 km of the coast in New South Wales. We identified six genetic groups, but there was no clear geographic pattern of distribution. Our results suggest that there is considerable gene flow among the sampled populations. These high-resolution genomic data support the findings of previous studies, and we infer that oceanographic processes promote genetic exchange among polychaete populations in south-eastern Australia.

Additional keywords: admixture, fisheries, genotype-by-sequencing, management, polychaete, population structure, SNP.


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