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Genetic delineation of sibling species of the pest fruit fly Bactocera (Diptera: Tephritidae) using microsatellites

Published online by Cambridge University Press:  09 March 2007

Y. Wang ,
H. Yu ,
K. Raphael  and
A.S. Gilchrist
Y. Wang
Affiliation:
Fruit Fly Research Centre, School of Biological Sciences A12, University of Sydney, New South Wales 2006, Australia
H. Yu
Affiliation:
Fruit Fly Research Centre, School of Biological Sciences A12, University of Sydney, New South Wales 2006, Australia
K. Raphael
Affiliation:
Fruit Fly Research Centre, School of Biological Sciences A12, University of Sydney, New South Wales 2006, Australia
A.S. Gilchrist*
Affiliation:
Fruit Fly Research Centre, School of Biological Sciences A12, University of Sydney, New South Wales 2006, Australia
*
*Fax: 61 2 9351 4771 E-mail: stuartg@bio.usyd.edu.au
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Abstract

Using a large set of microsatellites, the genetic relationships between three closely related Australian fruit fly species, Bactrocera tryoni (Froggatt), B. neohumeralis (Hardy) and B. aquilonis(May) were investigated. Bactrocera tryoni and B. neohumeralis are sympatric, while B. aquilonis is allopatric to both. The sympatric species, B. tryoni and B. neohumeralis, were found to be genetically distinct. It is likely that despite differences in mating time between these two species, some gene flow still occurs. In contrast, the sibling species B. tryoni and B. aquilonis were found to be closely related, despite allopatry. The level of genetic divergence was similar to that found within eastern Australian populations of B. tryoni. Consideration of all available genetic data suggests that this similarity is not due to recent (i.e. within the last 30 years) displacement of B. aquilonis by B. tryoni from the B. aquilonis region (north-western Australia). Instead the data suggests that, at least in the areas sampled, asymmetrical hybridization may have occurred over a longer timescale.

Type
Review Article
Information
Bulletin of Entomological Research , Volume 93 , Issue 4 , July 2003 , pp. 351 - 360
Copyright
Copyright © Cambridge University Press 2003

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