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Population Expansion and Genetic Structure in Carcharhinus brevipinna in the Southern Indo-Pacific

Geraghty, Pascal T. and Williamson, Jane E. and Macbeth, William G. and Wintner, Sabine P. and Harry, Alastair V. and Ovenden, Jennifer R. and Gillings, Michael R. (2013) Population Expansion and Genetic Structure in Carcharhinus brevipinna in the Southern Indo-Pacific. PLoS ONE, 8 (9). e75169.

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Article Link(s): http://dx.doi.org/10.1371%2Fjournal.pone.0075169

Abstract

Background:Quantifying genetic diversity and metapopulation structure provides insights into the evolutionary history of a species and helps develop appropriate management strategies. We provide the first assessment of genetic structure in spinner sharks (Carcharhinus brevipinna), a large cosmopolitan carcharhinid, sampled from eastern and northern Australia and South Africa.
Methods and Findings:Sequencing of the mitochondrial DNA NADH dehydrogenase subunit 4 gene for 430 individuals revealed 37 haplotypes and moderately high haplotype diversity (h = 0.6770 ±0.025). While two metrics of genetic divergence (ΦST and FST) revealed somewhat different results, subdivision was detected between South Africa and all Australian locations (pairwise ΦST, range 0.02717–0.03508, p values ≤ 0.0013; pairwise FST South Africa vs New South Wales = 0.04056, p = 0.0008). Evidence for fine-scale genetic structuring was also detected along Australia’s east coast (pairwise ΦST = 0.01328, p < 0.015), and between south-eastern and northern locations (pairwise ΦST = 0.00669, p < 0.04).Conclusions: The Indian Ocean represents a robust barrier to contemporary gene flow in C. brevipinna between Australia and South Africa. Gene flow also appears restricted along a continuous continental margin in this species, with data tentatively suggesting the delineation of two management units within Australian waters. Further sampling, however, is required for a more robust evaluation of the latter finding. Evidence indicates that all sampled populations were shaped by a substantial demographic expansion event, with the resultant high genetic diversity being cause for optimism when considering conservation of this commercially-targeted species in the southern Indo-Pacific.

Item Type:Article
Business groups:Animal Science
Subjects:Aquaculture and Fisheries > Fisheries > Fishery research
Science > Biology > Genetics
Deposited On:01 Jul 2014 04:55
Last Modified:01 Jul 2014 04:55

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