World phylogeography and male-mediated gene flow in the sandbar shark, Carcharhinus plumbeus

The sandbar shark, Carcharhinus plumbeus, is a large, cosmopolitan, coastal species. Females are thought to show philopatry to nursery grounds while males potentially migrate long distances, creating an opportunity for male‐mediated gene flow that may lead to discordance in patterns revealed by mito...

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Vydáno v:	Molecular ecology Ročník 19; číslo 10; s. 1994 - 2010
Hlavní autoři:	PORTNOY, DAVID S., MCDOWELL, JAN R., HEIST, EDWARD J., MUSICK, JOHN A., GRAVES, JOHN E.
Médium:	Journal Article
Jazyk:	angličtina
Vydáno:	Oxford, UK Blackwell Publishing Ltd 01.05.2010
Témata:	Animals Bayes Theorem Carcharhinus Carcharhinus plumbeus classification Cluster Analysis contemporary gene flow Deoxyribonucleic acid dispersal potential DNA DNA, Mitochondrial DNA, Mitochondrial - genetics elasmobranch Elasmobranchii Evolution, Molecular Female females Fish populations Gene Flow Genes Genetic Variation genetics Genetics, Population Geography Hawaii historical biogeography Male males Marine Microsatellite Repeats Mitochondrial DNA Nursery grounds philopatry Phylogeny phylogeography Sand bars secondary contact Sequence Analysis, DNA Sharks Sharks - classification Sharks - genetics Taiwan Hawaii Taiwan ISE, USA, Hawaii ISEW, Taiwan ISW, Australia, Western Australia
ISSN:	0962-1083, 1365-294X, 1365-294X
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Shrnutí:	The sandbar shark, Carcharhinus plumbeus, is a large, cosmopolitan, coastal species. Females are thought to show philopatry to nursery grounds while males potentially migrate long distances, creating an opportunity for male‐mediated gene flow that may lead to discordance in patterns revealed by mitochondrial DNA (mtDNA) and nuclear markers. While this dynamic has been investigated in elasmobranchs over small spatial scales, it has not been examined at a global level. We examined patterns of historical phylogeography and contemporary gene flow by genotyping 329 individuals from nine locations throughout the species’ range at eight nuclear microsatellite markers and sequencing the complete mtDNA control region. Pairwise comparisons often resulted in fixation indices and divergence estimates of greater magnitude using mtDNA sequence data than microsatellite data. In addition, multiple methods of estimation suggested fewer populations based on microsatellite loci than on mtDNA sequence data. Coalescent analyses suggest divergence and restricted migration among Hawaii, Taiwan, eastern and western Australia using mtDNA sequence data and no divergence and high migration rates, between Taiwan and both Australian sites using microsatellite data. Evidence of secondary contact was detected between several localities and appears to be discreet in time rather than continuous. Collectively, these data suggest complex spatial/temporal relationships between shark populations that may feature pulses of female dispersal and more continuous male‐mediated gene flow.
Bibliografie:	istex:B849432A081072D8D1B760C63BBF774D8F3FAB42 ark:/67375/WNG-GT5DHRG8-6 ArticleID:MEC4626 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 14 ObjectType-Article-1 ObjectType-Feature-2 content type line 23
ISSN:	0962-1083 1365-294X 1365-294X
DOI:	10.1111/j.1365-294X.2010.04626.x