Population expansion and genetic structure in Carcharhinus brevipinna in the southern Indo-Pacific
| Autor: | Jane E. Williamson, Sabine P. Wintner, William G. Macbeth, Alastair V. Harry, Jennifer R. Ovenden, Michael R. Gillings, Pascal T. Geraghty |
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| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
Conservation of Natural Resources
Science Molecular Sequence Data Population Dynamics Population Population genetics South Africa Animals education Indian Ocean Phylogeny DNA Primers Likelihood Functions education.field_of_study Genetic diversity Pacific Ocean Multidisciplinary Base Sequence Models Genetic biology Ecology Australia Genetic Variation NADH Dehydrogenase Sequence Analysis DNA biology.organism_classification Genetic divergence Phylogeography Genetics Population Genetic structure Sharks Medicine Carcharhinus brevipinna Sequence Alignment Indo-Pacific Research Article |
| Zdroj: | PLoS ONE, Vol 8, Iss 9, p e75169 (2013) PLoS ONE |
| ISSN: | 1932-6203 |
| Popis: | BackgroundQuantifying 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 findingsSequencing 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 F ST) 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 F ST 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).ConclusionsThe 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. |
| Databáze: | OpenAIRE |
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