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Genetic estimates of dispersal ability in the leucaena psyllid predator Curinus coeruleus (Coleoptera: Coccinellidae): implications for biological control

Published online by Cambridge University Press:  10 July 2009

Peter A. Follett  and
George K. Roderick
Peter A. Follett*
Affiliation:
Center for Conservation Research and Training, University of Hawaii at Manoa, Honolulu, Hawaii
George K. Roderick
Affiliation:
Center for Conservation Research and Training, University of Hawaii at Manoa, Honolulu, Hawaii
*
P.A. Follett, Department of Entomology, 3050 Maile Way, Gilmore 310, University of Hawaii at Manoa, Honolulu, Hawaii 96822, USA.
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Abstract

The leucaena psyllid, Heteropsylla cubana Crawford, can devastate plantings of Leucaena leucocephala (Leguminosae), an economically important tree species in the Pacific Islands, Southeast Asia, Australia, India, Africa, and elsewhere. The predatory beetle, Curinus coeruleus Mulsant (Coleoptera: Coccinellidae), has been introduced into many of these areas from Hawaii for biological control of the psyllid. In this study, collections of C. coeruleus were made from 11 populations on four islands in the Hawaiian archipelago to determine population structure and estimate levels of gene flow. Over all populations, a measure of population subdivision, θ was 0.095, and the estimate of Nem, the average migration rate, was 2.4. θ values for the individual islands were 0.02, 0.12, 0.24 and 0.05 for Kauai, Hawaii, Maui, and Oahu, respectively. Estimated levels of gene flow between populations were not correlated with geographic distance, therefore isolation by distance does not appear to be an important process structuring C. coeruleus populations. Gene flow estimates can be used to characterize dispersal capabilities in insects or other organisms released for biological control. In this case, the inferior dispersal ability of C. coeruleus likely limits its rapid widespread establishment during release programmes.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 86 , Issue 4 , August 1996 , pp. 355 - 361
Copyright
Copyright © Cambridge University Press 1996

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