Murky waters: searching for structure in genetically depauperate blue threadfin populations of Western Australia

Horne, John B., Momigliano, Paolo, van Herwerden, Lynne, and Newman, Stephen J. (2013) Murky waters: searching for structure in genetically depauperate blue threadfin populations of Western Australia. Fisheries Research, 146. pp. 1-6.

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Abstract

The blue threadfin (Eleutheronema tetradactylum) is an exploited fishery species in southeast Asia and Australia. Demographic studies have revealed fine-scale stock structure throughout the Australian coastline, with demographically isolated populations separated by only tens of km. Similarly, population genetic analysis revealed fine-scale structure across most of its Australian range with important implications for fisheries management. However, in northern Western Australia, genetic stock structure analysis showed a contradictory lack of structure. In the present study, one mtDNA marker and a suite of five microsatellite loci were used to further investigate the stock structure of Western Australian blue threadfin populations. By increasing sample sizes from previously investigated areas: Roebuck Bay (n = 93 adults) and Eighty-mile Beach (n = 92 adults and 163 recruits from two settlement cohorts), we were able to detect subtle genetic differentiation that was previously obscured by low levels of genetic polymorphism. Therefore, the same fine-scale stock structure that has been observed elsewhere in this species also appears to exist in Western Australia. This has clear ramifications for a revised management strategy that incorporates the fine scale structuring of northwest Western Australian stocks of the blue threadfin.

Item ID: 28415
Item Type: Article (Research - C1)
ISSN: 1872-6763
Keywords: Polynemidae, population genetics, self-recruitment, recruitment cohorts, fisheries management, West Australian thread fin, increased sample sizes, subtle genetic differentiation, revised management strategy
Date Deposited: 15 Aug 2013 06:09
FoR Codes: 06 BIOLOGICAL SCIENCES > 0604 Genetics > 060411 Population, Ecological and Evolutionary Genetics @ 50%
07 AGRICULTURAL AND VETERINARY SCIENCES > 0704 Fisheries Sciences > 070403 Fisheries Management @ 50%
SEO Codes: 96 ENVIRONMENT > 9608 Flora, Fauna and Biodiversity > 960808 Marine Flora, Fauna and Biodiversity @ 50%
96 ENVIRONMENT > 9608 Flora, Fauna and Biodiversity > 960802 Coastal and Estuarine Flora, Fauna and Biodiversity @ 50%
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