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Density-dependent processes in leaf beetles feeding on purple loosestrife: aggregative behaviour affecting individual growth rates

Published online by Cambridge University Press:  24 February 2010

P.A. Hambäck
P.A. Hambäck*
Affiliation:
Department of Botany, Stockholm University, SE-106 91Stockholm, Sweden
*
*Fax: +46-8-165525 E-mail: peter.hamback@botan.su.se
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Abstract

Aggregative responses are commonly observed in insects, including chrysomelids, affecting both individual and population growth rates. In two closely related chrysomelid beetles (Galerucella calmariensis and G. pusilla) feeding on purple loosestrife (Lythrum salicaria), recent studies suggest that male-produced pheromones may cause both inter- and intraspecific attraction. This paper further examines the causes and consequences of feeding aggregations in these species. Olfactometer studies confirm previous findings, showing cross-species attraction to damaged plants, but suggest that also damaged induced plant volatiles may be involved. In addition, the studies suggest that the cross-species attraction observed in previous studies have asymmetric effects on the two beetles. Galerucella pusilla was more attracted to damage by G. calmariensis than to damage by conspecifics. Laboratory and field data suggest that feeding aggregations in these species increase pupal mass, at least at low to intermediate larval densities. This positive feedback may have important consequences for the spatiotemporal dynamics and as a consequence on the role of the two chrysomelid beetles on biological control of purple loosestrife.

Keywords

Galerucella calmariensisGalerucella pusillaLythrum salicariaaggregation pheromonedensity dependence
Type
Research Paper
Information
Bulletin of Entomological Research , Volume 100 , Issue 5 , October 2010 , pp. 605 - 611
Copyright
Copyright © Cambridge University Press 2010

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