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Evolutionary, molecular and comparative zoology
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RESEARCH ARTICLE
Contents Vol 54(2)

Variation in population structure across the ecological range of the Queensland fruit fly, Bactrocera tryoni

A. S. Gilchrist A D , B. Dominiak B , P. S. Gillespie C and J. A. Sved A
+ Author Affiliations
- Author Affiliations

A Fruit Fly Research Centre, School of Biological Sciences A12, University of Sydney, NSW 2006, Australia.

B NSW Department of Primary Industries, 161 Kite Street, Orange, NSW 2800, Australia.

C NSW Department of Primary Industries, Forest Road, Orange, NSW 2800, Australia.

D Corresponding author. Email: stuartg@bio.usyd.edu.au

Australian Journal of Zoology 54(2) 87-95 https://doi.org/10.1071/ZO05020
Submitted: 16 April 2005  Accepted: 8 March 2006   Published: 11 May 2006

Abstract

We sampled a pest fruit fly species, the Queensland fruit fly, Bactrocera tryoni, across its entire ecological range in eastern Australia, from ancestral high-density populations in tropical regions through to isolated outbreak populations in marginal arid areas. Using DNA microsatellite markers, we found that in ancestral areas, population differentiation was low and populations were genetically homogeneous over large distances. In more temperate areas, populations were far more genetically differentiated but there was no pattern of isolation-by-distance (no drift/migration equilibrium). Genetic drift appeared to be the major influence on population differentiation. The transition between these extremes was abrupt and unexpectedly far from the species border. Limited geographic structuring among the non-equilibrium populations was apparent from patterns of genetic differentiation, patterns of allelic richness and an ordination analysis. Our results also suggested that there might be recurring migration of flies into a neighbouring quarantine area.


Acknowledgments

We are grateful to Matthew Kerr, Xiu Mei Liang and Sasha Curthoys for their assistance in this study. The work was supported by grants from Woolworths Supermarkets, the Australian Research Council, and Horticulture Australia.


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