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Type: Journal article
Title: Exceptional among-lineage variation in diversification rates during the radiation of Australia's most diverse vertebrate clade
Author: Rabosky, D.
Donnellan, S.
Talaba, A.
Lovette, I.
Citation: Proceedings of the Royal Society B: Biological Sciences, 2007; 274(1628):2915-2923
Publisher: Royal Soc London
Issue Date: 2007
ISSN: 0962-8452
Statement of
Daniel L. Rabosky, Stephen C. Donnellan, Amanda L. Talaba and Irby J. Lovette
Abstract: The disparity in species richness among groups of organisms is one of the most pervasive features of life on earth. A number of studies have addressed this pattern across higher taxa (e.g. ‘beetles’), but we know much less about the generality and causal basis of the variation in diversity within evolutionary radiations at lower taxonomic scales. Here, we address the causes of variation in species richness among major lineages of Australia's most diverse vertebrate radiation, a clade of at least 232 species of scincid lizards. We use new mitochondrial and nuclear intron DNA sequences to test the extent of diversification rate variation in this group. We present an improved likelihood-based method for estimating per-lineage diversification rates from combined phylogenetic and taxonomic (species richness) data, and use the method in a hypothesis-testing framework to localize diversification rate shifts on phylogenetic trees. We soundly reject homogeneity of diversification rates among members of this radiation, and find evidence for a dramatic rate increase in the common ancestor of the genera Ctenotus and Lerista. Our results suggest that the evolution of traits associated with climate tolerance may have had a role in shaping patterns of diversity in this group.
Keywords: Animals
DNA, Mitochondrial
DNA, Intergenic
Likelihood Functions
Bayes Theorem
Sequence Analysis, DNA
Species Specificity
Rights: Copyright © 2007 The Royal Society
DOI: 10.1098/rspb.2007.0924
Published version:
Appears in Collections:Aurora harvest
Earth and Environmental Sciences publications
Environment Institute publications

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