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Evolutionary, molecular and comparative zoology
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RESEARCH ARTICLE
Contents Vol 54(4)

A molecular phylogeny of the Australian monitor lizards (Squamata : Varanidae) inferred from mitochondrial DNA sequences

A. J. Fitch A B C , A. E. Goodman A and S. C. Donnellan B
+ Author Affiliations
- Author Affiliations

A School of Biological Sciences, Flinders University, GPO Box 2100, SA 5001, Australia.

B Evolutionary Biology Unit and Centre for Evolutionary Biology and Biodiversity, South Australian Museum, North Terrace, Adelaide, SA 5000, Australia.

C Corresponding author. Email: alison.fitch@flinders.edu.au

Australian Journal of Zoology 54(4) 253-269 https://doi.org/10.1071/ZO05038
Submitted: 11 July 2005  Accepted: 9 May 2006   Published: 11 August 2006

Abstract

To date no complete phylogeny of all of the currently recognised Indo-Australian varanid species and subspecies has been published. This paper presents a comprehensive mitochondrial gene phylogeny of these lizards. A portion of the mitochondrial genome comprising part of the ND4 gene and three adjacent tRNA genes (hereafter referred to as ND4) was analysed alone and, for a subset of the taxa, combined with previously published mitochondrial data. Similar tree topologies were produced by both datasets although combining the data helped resolve some of the unresolved or weakly supported nodes in the ND4 analyses. The monophyly of the Indo-Australian group was strongly supported in all analyses. This group comprised three major lineages: the gouldii group, the Odatria group and the varius group. Mitochondrial ND4 nucleotide sequences were successfully amplified from all of the Indo-Australian monitor species and subspecies currently recognised and, as such, is the first comprehensive phylogenetic study of the Australian monitor lizards published. Analysis of the tempo of diversification and evolution of preferred habitat use identified six episodes of increased net speciation rate, with two closely adjacent episodes showing the highest rates of diversification and correlating with the appearance of all preferred habitat types. The comprehensive molecular phylogenetic framework will also be useful for the identification of varanid species and traded products derived from monitors and, as such, has important applications for wildlife management and conservation.


Acknowledgments

We thank G. Armstrong, J. Armstrong, M. Bonnett, P. Canty, A. de Chambrier, T. Chesser, R. Foster, C. Grant, D. Holland, P. Horner, R. How, M. Hutchinson, R. Leys, B. Maryan, T. Reardon, S. Richards, R. Sadlier, A. Skinner, S. Smith and S. Sweet for kindly collecting and/or donating tissues. Additionally, we thank A. Skinner and two anonymous referees for comments on the manuscript. This work was funded in part by a South Australian Department for Environment and Heritage Wildlife Conservation Fund grant and the Flinders University. AJF was supported by a Flinders University Research award.


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