Population expansion and genetic structure in Carcharhinus brevipinna in the Southern Indo-Pacific

Geraghty, Pascal T., Williamson, Jane E., Macbeth, William G., Wintner, Sabine P., Harry, Alastair V., 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: e75169.1-e75169.17. doi:10.1371/journal.pone.0075169

Author Geraghty, Pascal T.
Williamson, Jane E.
Macbeth, William G.
Wintner, Sabine P.
Harry, Alastair V.
Ovenden, Jennifer R.
Gillings, Michael R.
Title Population expansion and genetic structure in Carcharhinus brevipinna in the Southern Indo-Pacific
Journal name PloS One   Check publisher's open access policy
ISSN 1932-6203
Publication date 2013-09-25
Year available 2013
Sub-type Article (original research)
DOI 10.1371/journal.pone.0075169
Open Access Status DOI
Volume 8
Issue 9
Start page e75169.1
End page e75169.17
Total pages 18
Place of publication San Francisco, CA United States
Publisher Public Library of Science
Language eng
Subject 1100 Agricultural and Biological Sciences
1300 Biochemistry, Genetics and Molecular Biology
2700 Medicine
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.
Keyword Pelagic larval duration
Indo Pacific
Reef fish
Teleostei Gobioidei
Northern Australia
Range expansion
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2014 Collection
School of Biomedical Sciences Publications
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