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Pest fruit fly (Diptera: Tephritidae) in northwestern Australia: one species or two?

Published online by Cambridge University Press:  14 July 2009

E.C. Cameron ,
J.A. Sved  and
A.S. Gilchrist
E.C. Cameron*
Affiliation:
School of Biological Sciences, Macleay Building A12, University of Sydney, NSW2006, Australia
J.A. Sved
Affiliation:
School of Biological Sciences, Macleay Building A12, University of Sydney, NSW2006, Australia
A.S. Gilchrist
Affiliation:
School of Biological Sciences, Macleay Building A12, University of Sydney, NSW2006, Australia
*
*Author for correspondence Fax: 1 932 732 9257 E-mail: [email protected]
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Abstract

Since 1985, a new and serious fruit fly pest has been reported in northwestern Australia. It has been unclear whether this pest was the supposedly benign endemic species, Bactrocera aquilonis, or a recent introduction of the morphologically near-identical Queensland fruit fly, B. tryoni. B. tryoni is a major pest throughout eastern Australia but is isolated from the northwest region by an arid zone. In the present study, we sought to clarify the species status of these new pests using an extensive DNA microsatellite survey across the entire northwest region of Australia. Population differentiation tests and clustering analyses revealed a high degree of homogeneity within the northwest samples, suggesting that just one species is present in the region. That northwestern population showed minimal genetic differentiation from B. tryoni from Queensland (FST=0.015). Since 2000, new outbreaks of this pest fruit fly have occurred to the west of the region, and clustering analysis suggested recurrent migration from the northwest region rather than Queensland. Mitochondrial DNA sequencing also showed no evidence for the existence of a distinct species in the northwest region. We conclude that the new pest fruit fly in the northwest is the endemic population of B. aquilonis but that there is no genetic evidence supporting the separation of B. aquilonis and B. tryoni as distinct species.

Keywords

Fruit flyBactrocera aquilonisBactrocera tryonipopulation differentiationallopatrytephritid
Type
Research Paper
Information
Bulletin of Entomological Research , Volume 100 , Issue 2 , April 2010 , pp. 197 - 206
Copyright
Copyright © Cambridge University Press 2009

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