title: Phylogenetic relationships of rock-wallabies, Petrogale (Marsupialia: Macropodidae) and their biogeographic history within Australia.
abstract: The rock-wallaby genus Petrogale comprises a group of habitat-specialist macropodids endemic to Australia. Their restriction to rocky outcrops, with infrequent interpopulation dispersal, has been suggested as the cause of their recent and rapid diversification. Molecular phylogenetic relationships within and among species of Petrogale were analysed using mitochondrial (cytochrome oxidase c subunit 1, cytochrome b, NADH dehydrogenase subunit 2) and nuclear (omega-globin intron, breast and ovarian cancer susceptibility gene) sequence data with representatives that encompassed the morphological and chromosomal variation within the genus, including for the first time both Petrogale concinna and Petrogale purpureicollis. Four distinct lineages were identified, (1) the brachyotis group, (2) Petrogale persephone, (3) Petrogalexanthopus and (4) the lateralis-penicillata group. Three of these lineages include taxa with the ancestral karyotype (2n=22). Paraphyletic relationships within the brachyotis group indicate the need for a focused phylogeographic study. There was support for P. purpureicollis being reinstated as a full species and P. concinna being placed within Petrogale rather than in the monotypic genus Peradorcas. Bayesian analyses of divergence times suggest that episodes of diversification commenced in the late Miocene-Pliocene and continued throughout the Pleistocene. Ancestral state reconstructions suggest that Petrogale originated in a mesic environment and dispersed into more arid environments, events that correlate with the timing of radiations in other arid zone vertebrate taxa across Australia.
authors: School of Earth & Environmental Science and Australian Centre for Evolutionary Biology and Biodiversity, University of Adelaide, SA 5005, Australia. Sally.Potter@austmus.gov.au
authors: Sally
authors: S
authors: Potter
authors: Steven J B
authors: SJ
authors: Cooper
authors: Cushla J
authors: CJ
authors: Metcalfe
authors: David A
authors: DA
authors: Taggart
authors: Mark D B
authors: MD
authors: Eldridge
mesh_terms: D000818:Animals; D001315:Australia; D001499:Bayes Theorem; D005075:Biological Evolution; D002467:Cell Nucleus / Q000235:genetics; D045303:Cytochromes b / Q000235:genetics*; D004272:DNA, Mitochondrial / Q000145:classification / Q000235:genetics*; D003576:Electron Transport Complex IV / Q000235:genetics*; D049810:Genetic Speciation; D014644:Genetic Variation; D007621:Karyotyping; D007614:Macropodidae / Q000145:classification / Q000235:genetics*; D009245:NADH Dehydrogenase / Q000235:genetics*; D010802:Phylogeny; D058974:Phylogeography; D017422:Sequence Analysis, DNA
chemical_list: D004272:DNA, Mitochondrial; D045303:Cytochromes b; C088908:NADH dehydrogenase II; D009245:NADH Dehydrogenase; D003576:Electron Transport Complex IV