Oceanic and coastal populations of a harvested macroinvertebrate Rochia nilotica in north-western Australia are isolated and may be locally adapted
Oliver Berry
A D H I , Zoe Richards B C D , Glenn Moore C D , Udhi Hernawan D E , Mike Travers F and Bernd Gruber G
+ Author Affiliations
- Author Affiliations
A CSIRO Oceans and Atmosphere, Indian Ocean Marine Research Centre, The University of Western Australia, Crawley, WA 6009, Australia.
B Trace and Environmental DNA Laboratory, School of Molecular and Life Sciences, Curtin University, Bentley, WA 6102, Australia.
C Department of Aquatic Zoology, Western Australian Museum, Locked Bag 49 Welshpool DC, WA 6986, Australia.
D Western Australian Marine Science Institution. Indian Ocean Marine Research Centre, The University of Western Australia, Crawley, WA 6009, Australia.
E Centre for Marine Ecosystems Research, Edith Cowan University, 270 Joondalup Drive, Joondalup, WA 6027, Australia.
F Fisheries Division, Department of Primary Industries and Regional Development, 39 Northside Drive, Hillarys, WA 6025, Australia.
G Institute for Applied Ecology, Faculty of Applied Science, University of Canberra, ACT 2601, Australia.
H Present address: CSIRO Environomics Future Science Platform, The University of Western Australia, Crawley, WA 6009, Australia.
I Corresponding author. Email: oliver.berry@csiro.au
Marine and Freshwater Research 71(7) 782-793 https://doi.org/10.1071/MF19172
Submitted: 14 May 2019 Accepted: 12 August 2019 Published: 28 October 2019
Abstract
Marine macroinvertebrates support important fisheries throughout the Indo-Pacific, but stocks of species such as trochus (Rochia nilotica) are easily overharvested. In north-western Australia, trochus are taken from inshore reefs by Indigenous Australians and oceanic reefs by artisanal Indonesian fishers. The management of these environmentally distinct regions relies on understanding their spatial interdependencies, yet connectivity between them has not been evaluated empirically. Here, we used genotype-by-sequencing analysis of 514 trochus samples collected from 17 locations (15 in the inshore Kimberley, 2 offshore oceanic sites). Analysis of 5428 polymorphic single nucleotide polymorphism loci revealed significant genetic subdivision between the oceanic and coastal sites, and a subset of loci exhibited significantly higher subdivision, suggesting they are subject to directional selection. Population differentiation was also evident between the two oceanic sites, but not between coastal sites. Trochus populations from the coastal Kimberley and oceanic reefs represent two genetically and demographically independent units, with preliminary evidence for local adaptation to these distinctive environments. Management strategies for R. nilotica reflect these divisions, but the limited connectivity among oceanic populations indicates that they are vulnerable to overexploitation. Furthermore, their potential adaptive distinctiveness indicates that coastal stocks may be unsuitable for replenishing oceanic stocks.
Additional keywords: fisheries management, genomic, population connectivity, Tectus, trochus.
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