Detection of interspecies hybridisation in Chondrichthyes: Hybrids and hybrid offspring between Australian (Carcharhinus tilstoni) and common (C. limbatus) blacktip shark found in an Australian fishery

Morgan, Jess A. T., Harry, Alastair V., Welch, David J., Street, Raewyn, White, Jimmy, Geraghty, Pascal T., Macbeth, William G., Tobin, Andrew, Simpfendorfer, Colin A. and Ovenden, Jennifer R. (2012) Detection of interspecies hybridisation in Chondrichthyes: Hybrids and hybrid offspring between Australian (Carcharhinus tilstoni) and common (C. limbatus) blacktip shark found in an Australian fishery. Conservation Genetics, 13 2: 455-463. doi:10.1007/s10592-011-0298-6

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Author Morgan, Jess A. T.
Harry, Alastair V.
Welch, David J.
Street, Raewyn
White, Jimmy
Geraghty, Pascal T.
Macbeth, William G.
Tobin, Andrew
Simpfendorfer, Colin A.
Ovenden, Jennifer R.
Title Detection of interspecies hybridisation in Chondrichthyes: Hybrids and hybrid offspring between Australian (Carcharhinus tilstoni) and common (C. limbatus) blacktip shark found in an Australian fishery
Formatted title Detection of interspecies hybridisation in Chondrichthyes: Hybrids and hybrid offspring between Australian (Carcharhinus tilstoni) and common (C. limbatus) blacktip shark found in an Australian fishery
Journal name Conservation Genetics   Check publisher's open access policy
ISSN 1566-0621
1572-9737
Publication date 2012-04
Year available 2011
Sub-type Article (original research)
DOI 10.1007/s10592-011-0298-6
Volume 13
Issue 2
Start page 455
End page 463
Total pages 9
Place of publication Dordrecht, Netherlands
Publisher Springer
Collection year 2012
Language eng
Formatted abstract Interspecies hybridisation in nature is a well-studied phenomenon, but it has not been analysed using genetic markers in the class Chondrichthyes (sharks, rays and chimeras). Two black-tip whaler shark species (Australian, Carcharhinus tilstoni; Common, C. limbatus) have overlapping distributions in Australia, distinct mitochondrial DNA sequence (ND4, COI, control region) and distinct morphological features such as length at sexual maturity, length at birth and number of vertebrae. A mismatch was observed between species identification using mtDNA sequence and species identification using morphological characters. To test whether hybridisation between the two species was responsible, a nuclear gene with species-specific mutations was sequenced. Extensive interspecies hybridisation was found to be occurring. Hybrids were found from five locations on the eastern Australian coastline, spanning 2,000 km. If hybrid fitness is low and hybrids are common, then fisheries recruitment may be overestimated and the productivity of the black-tip shark fishery may be well below that required to support commercial exploitation. To guard against identification errors, the likelihood of hybridisation and subsequent introgression should be assessed prior to using mtDNA (e.g. barcoding) to identify shark species. The C. limbatusC. tilstoni species complex provides a unique opportunity to investigate the ability of sharks to adapt to environmental change, in particular, the impact of hybridization on species distributions which favour C. tilstoni along the north and C. limbatus along the south eastern Australian coastline.
Keyword Introgression
Hybrid fitness
Chondrichthyes
Barcoding
Mitochondrial DNA
Nuclear DNA
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Published online: 17 December 2011. Authors prepress title: "Detection of interspecies hybridisation in Chondrichthyes: First generation hybrids (and offspring of hybrids) between Australian (Carcharhinus tilstoni) and Common blacktip shark (C. limbatus) found in an Australian fishery".

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2012 Collection
Queensland Alliance for Agriculture and Food Innovation
 
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Created: Tue, 07 Feb 2012, 17:21:08 EST by Dr Jessica Morgan on behalf of Qld Alliance for Agriculture and Food Innovation