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Accounting for kin sampling reveals genetic connectivity in Tasmanian and New Zealand school sharks, Galeorhinus galeus

Citation

Devloo-Delva, F and Maes, GE and Hernandez, SI and McAllister, JD and Gunasekera, RM and Grewe, PM and Thomson, RB and Feutry, P, Accounting for kin sampling reveals genetic connectivity in Tasmanian and New Zealand school sharks, Galeorhinus galeus, Ecology and Evolution, 9, (8) pp. 4465-4472. ISSN 2045-7758 (2019) [Refereed Article]


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Copyright 2019 the authors. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/

DOI: doi:10.1002/ece3.5012

Abstract

Fishing represents a major problem for conservation of chondrichthyans, with a quarter of all species being overexploited. School sharks, Galeorhinus galeus, are targeted by commercial fisheries in Australia and New Zealand. The Australian stock has been depleted to below 20% of its virgin biomass, and the species is recorded as Conservation Dependent within Australia. Individuals are known to move between both countries, but it is disputed whether the stocks are reproductively linked. Accurate and unbiased determination of stock and population connectivity is crucial to inform effective management. In this study, we assess the genetic composition and population connectivity between Australian and New Zealand school sharks using genome‐wide SNPs, while accounting for non‐random kin sampling. Between 2009 and 2013, 88 neonate and juvenile individuals from Tasmanian and New Zealand nurseries were collected and genotyped. Neutral loci were analyzed to detect fine‐scale signals of reproductive connectivity. Seven full‐sibling groups were identified and removed for unbiased analysis. Based on 6,587 neutral SNPs, pairwise genetic differentiation from Tasmanian and New Zealand neonates was non‐significant (FST=0.0003, CI95=[−0.0002, 0.0009], p=0.1163; Dest=0.00060.0002). This pattern was supported by clustering results. In conclusion, we show a significant effect of non‐random sampling of kin and identify fine‐scale reproductive connectivity between Australian and New Zealand school sharks.

Item Details

Item Type:Refereed Article
Keywords:close kin, genetic structure assessment, population genomics, sampling bias, shark fisheries, single nucleotide polymorphisms
Research Division:Agricultural and Veterinary Sciences
Research Group:Fisheries Sciences
Research Field:Fish Physiology and Genetics
Objective Division:Animal Production and Animal Primary Products
Objective Group:Fisheries - Wild Caught
Objective Field:Fisheries - Wild Caught not elsewhere classified
UTAS Author:Devloo-Delva, F (Mr Floriaan Devloo-delva)
UTAS Author:McAllister, JD (Dr Jaime McAllister)
ID Code:132757
Year Published:2019
Web of Science® Times Cited:1
Deposited By:Fisheries and Aquaculture
Deposited On:2019-05-20
Last Modified:2020-01-14
Downloads:5 View Download Statistics

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