Genetic divergence, speciation and biogeography of Mustelus (sharks) in the central Indo-Pacific and Australasia.
The shark genus Mustelus is speciose, commercially important and systematically troublesome. We use a molecular approach combining inter and intra-specific data to investigate Mustelus species in the central Indo-Pacific and Australasia. Our analysis supports two Mustelus clades, one comprising species with no white spots and a placental reproductive mode and a second clade of white spotted, aplacental species. Levels of genetic divergence are low, especially among species in the white spotted, aplacental clade and this should be taken into account when employing molecular data to delineate species. Our data support the hypothesis of a radiation following dispersal from a northern hemisphere ancestor. Molecular dating suggests that localised speciation in Australasia may have occurred during the Pleistocene. We propose that some of the difficulties associated with Mustelus systematics relate to a recent radiation, particularly in the Australasian region.
Department of Biological Sciences, Macquarie University, NSW 2109, Australia. jessica.boomer@mq.edu.au
Jessica J
JJ
Boomer
Robert G
RG
Harcourt
Malcolm P
MP
Francis
Adam J
AJ
Stow
D000818:Animals; D044362:Australasia; D002467:Cell Nucleus / Q000235:genetics; D004272:DNA, Mitochondrial / Q000235:genetics; D049810:Genetic Speciation; D016013:Likelihood Functions; D010140:Pacific Ocean; D010802:Phylogeny; D058974:Phylogeography; D017422:Sequence Analysis, DNA; D012754:Sharks / Q000145:classification* / Q000235:genetics
D004272:DNA, Mitochondrial