Outlier SNPs detect weak regional structure against a background of genetic homogeneity in the Eastern Rock Lobster, Sagmariasus verreauxi

Woodings, Laura N., Murphy, Nicholas P., Doyle, Stephen R., Hall, Nathan E., Robinson, Andrew J., Liggins, Geoffrey W., Green, Bridget S., Cooke, Ira R., Bell, James J., and Strugnell, Jan M. (2018) Outlier SNPs detect weak regional structure against a background of genetic homogeneity in the Eastern Rock Lobster, Sagmariasus verreauxi. Marine Biology, 165 (12). 185.

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Genetic differentiation is characteristically weak in marine species making assessments of population connectivity and structure difficult. However, the advent of genomic methods has increased genetic resolution, enabling studies to detect weak, but significant population differentiation within marine species. With an increasing number of studies employing high resolution genome-wide techniques, we are realising that the connectivity of marine populations is often complex and quantifying this complexity can provide an understanding of the processes shaping marine species genetic structure and to inform long-term, sustainable management strategies. This study aims to assess the genetic structure, connectivity, and local adaptation of the Eastern Rock Lobster (Sagmariasus verreauxi), which has a maximum pelagic larval duration of 12 months and inhabits both subtropical and temperate environments. We used 645 neutral and 15 outlier SNPs to genotype lobsters collected from the only two known breeding populations and a third episodic population—encompassing S. verreauxi's known range. Through examination of the neutral SNP panel, we detected genetic homogeneity across the three regions, which extended across the Tasman Sea encompassing both Australian and New Zealand populations. We discuss differences in neutral genetic signature of S. verreauxi and a closely related, co-distributed rock lobster, Jasus edwardsii, determining a regional pattern of genetic disparity between the species, which have largely similar life histories. Examination of the outlier SNP panel detected weak genetic differentiation between the three regions. Outlier SNPs showed promise in assigning individuals to their sampling origin and may prove useful as a management tool for species exhibiting genetic homogeneity.

Item ID: 56515
Item Type: Article (Research - C1)
ISSN: 1432-1793
Copyright Information: © Springer-Verlag GmbH Germany, part of Springer Nature 2018. The Accepted Manuscript version of this paper is available Open Access under a Creative Commons Non Commercial No-Derivative works license.
Funders: Australian Research Council (ARC), La Trobe University, Holsworth Wildlife Research Endowment, Institute for Marine and Antarctic Studies (IMAS), NSW Department of Primary Industries
Projects and Grants: ARC DP 150101491, La Trobe University Securing Food, Water and Environment Grant
Date Deposited: 05 Dec 2018 07:53
FoR Codes: 30 AGRICULTURAL, VETERINARY AND FOOD SCIENCES > 3005 Fisheries sciences > 300502 Aquaculture and fisheries stock assessment @ 50%
31 BIOLOGICAL SCIENCES > 3105 Genetics > 310599 Genetics not elsewhere classified @ 50%
SEO Codes: 83 ANIMAL PRODUCTION AND ANIMAL PRIMARY PRODUCTS > 8302 Fisheries - Wild Caught > 830202 Wild Caught Crustaceans (excl. Rock Lobster and Prawns) @ 50%
96 ENVIRONMENT > 9608 Flora, Fauna and Biodiversity > 960808 Marine Flora, Fauna and Biodiversity @ 50%
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