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The spatiotemporal dynamics of Tribolium castaneum (Herbst): adult flight and gene flow.

Ridley, A.W. and Hereward, J.P. and Daglish, G.J. and Raghu, S. and Collins , P.J. and Walter, G.H. (2011) The spatiotemporal dynamics of Tribolium castaneum (Herbst): adult flight and gene flow. Molecular Ecology, 20 (8). pp. 1635-1646.

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Article Link(s): http://dx.doi.org/10.1111/j.1365-294X.2011.05049.x

Publisher URL: http://onlinelibrary.wiley.com

Abstract

Tribolium castaneum (Herbst) has been used as a model organism to develop and test important ecological and evolutionary concepts and is also a major pest of grain and grain products globally. This beetle species is assumed to be a good colonizer of grain storages through anthropogenic movement of grain, and active dispersal by flight is considered unlikely. Studies using T. castaneum have therefore used confined or walking insects. We combine an ecological study of dispersal with an analysis of gene flow using microsatellites to investigate the spatiotemporal dynamics and adult flight of T. castaneum in an ecological landscape in eastern Australia. Flying beetles were caught in traps at grain storages and in fields at least 1 km from the nearest stored grain at regular intervals for an entire year. Significantly more beetles were trapped at storages than in fields, and almost no beetles were caught in native vegetation reserves many kilometres from the nearest stored grain. Genetic differentiation between beetles caught at storages and in fields was low, indicating that although T. castaneum is predominantly aggregated around grain storages, active dispersal takes place to the extent that significant gene flow occurs between them, mitigating founder effects and genetic drift. By combining ecological and molecular techniques, we reveal much higher levels of active dispersal through adult flight in T. castaneum than previously thought. We conclude that the implications of adult flight to previous and future studies on this model organism warrant consideration.

Item Type:Article
Corporate Creators:Department of Employment, Economic Development and Innovation (DEEDI), Agri-Science, Crop and Food Science, Queensland University of Technology, Cooperative Reserach Centre for National Plant Biosecurity
Business groups:Agri-Science, Crop and Food Science
Additional Information:© 2011 State of Queensland, Department of Employment, Economic Development and Innovation.
Keywords:Dispersal; flight; gene flow; genetic markers; insect pests; microsatellites; spatial variation; stored products; temporal variation; pest insects; Tribolium castaneum; Australia.
Subjects:Plant pests and diseases > Economic entomology
Plant culture > Field crops
Deposited On:08 Sep 2011 04:49
Last Modified:26 Oct 2011 00:19

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