A parallel population genomic and hydrodynamic approach to fishery management of highly-dispersive marine invertebrates: the case of the Fijian Black-Lip Pearl Oyster Pinctada margaritifera

Lal, Monal M., Southgate, Paul C., Jerry, Dean R., Bosserelle, Cyprien, and Zenger, Kyall R. (2016) A parallel population genomic and hydrodynamic approach to fishery management of highly-dispersive marine invertebrates: the case of the Fijian Black-Lip Pearl Oyster Pinctada margaritifera. PLoS One, 11 (8). e0161390. pp. 1-26.

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Abstract

Fishery management and conservation of marine species increasingly relies on genetic data to delineate biologically relevant stock boundaries. Unfortunately for high gene flow species which may display low, but statistically significant population structure, there is no clear consensus on the level of differentiation required to resolve distinct stocks. The use of fine-scale neutral and adaptive variation, considered together with environmental data can offer additional insights to this problem. Genome-wide genetic data (4,123 SNPs), together with an independent hydrodynamic particle dispersal model were used to inform farm and fishery management in the Fijian black-lip pearl oyster Pinctada margaritifera, where comprehensive fishery management is lacking, and the sustainability of exploitation uncertain. Weak fine-scale patterns of population structure were detected, indicative of broad-scale panmixia among wild oysters, while a hatchery-sourced farmed population exhibited a higher degree of genetic divergence (F-st = 0.0850-0.102). This hatchery-produced population had also experienced a bottleneck (N-eLD = 5.1; 95% C.I. = [5.1-5.3]); compared to infinite NeLD estimates for all wild oysters. Simulation of larval transport pathways confirmed the existence of broad-scale mixture by surface ocean currents, correlating well with fine-scale patterns of population structuring. F-st outlier tests failed to detect large numbers of loci supportive of selection, with 2-5 directional outlier SNPs identified (average F-st = 0.116). The lack of biologically significant population genetic structure, absence of evidence for local adaptation and larval dispersal simulation, all indicate the existence of a single genetic stock of P. margaritifera in the Fiji Islands. This approach using independent genomic and oceanographic tools has allowed fundamental insights into stock structure in this species,with transferability to other highly-dispersive marine taxa for their conservation and management.

Item ID: 46402
Item Type: Article (Research - C1)
ISSN: 1932-6203
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Copyright: © 2016 Lal et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

A version of this publication was included as Chapter 2 of the following PhD thesis: Lal, Monal M. (2016) Genetic structure, population connectivity and taxonomic identity of the black-lip pearl oyster Pinctada margaritifera (Bivalvia: Pteriidae), across its Indo-Pacific distribution. PhD thesis, James Cook University, which is available Open Access in ResearchOnline@JCU. Please see the Related URLs for access.

Funders: Australian Centre for International Agricultural Research (ACIAR)
Projects and Grants: ACIAR FIS/2009/057
Date Deposited: 09 Nov 2016 07:41
FoR Codes: 07 AGRICULTURAL AND VETERINARY SCIENCES > 0704 Fisheries Sciences > 070401 Aquaculture @ 70%
07 AGRICULTURAL AND VETERINARY SCIENCES > 0704 Fisheries Sciences > 070405 Fish Physiology and Genetics @ 30%
SEO Codes: 83 ANIMAL PRODUCTION AND ANIMAL PRIMARY PRODUCTS > 8301 Fisheries - Aquaculture > 830104 Aquaculture Oysters @ 100%
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