DNA microsatellite analysis of naturally occurring colour intermediates between Bactrocera tryoni (Froggatt) and Bactrocera neohumeralis (Hardy) (Diptera: Tephritidae)

The sympatric tephritid fruit flies Bactrocera tryoni (Froggatt) (Queensland fruit fly) and B. neohumeralis (Hardy) differ in time of mating and for the colour of the humeral callus ('shoulder pad'), which is typically entirely yellow in B. tryoni and typically entirely brown in B. neohume...

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Bibliographic Details
Published in:Australian journal of entomology 2006-05, Vol.45 (2), p.157-162
Main Authors: Gilchrist, A.Stuart, Ling, Alison E
Format: Article
Language:English
Subjects:
Bactrocera
Bactrocera neohumeralis
Bactrocera tryoni
Diptera
humeral callus
hybridisation
hybridization
mating time
ordination
Tephritidae
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Summary:The sympatric tephritid fruit flies Bactrocera tryoni (Froggatt) (Queensland fruit fly) and B. neohumeralis (Hardy) differ in time of mating and for the colour of the humeral callus ('shoulder pad'), which is typically entirely yellow in B. tryoni and typically entirely brown in B. neohumeralis. Field collections in sympatric regions usually include at least 1% of individuals whose humeral calli show mixed patches of yellow and brown ('intermediates'). Over 40 years, a number of studies have debated the possibility that these intermediates are interspecific hybrids. In the present study, we have used microsatellites to show that few if any of these intermediates are hybrids. Instead, most variation humeral callus appears to be confined to one species, B. tryoni. We discuss these results in the context of geneflow between the two species and suggest directions for future research.
ISSN:1326-6756
1440-6055
DOI:10.1111/j.1440-6055.2006.00522.x