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Effect of the symbiont Candidatus Erwinia dacicola on mating success of the olive fly Bactrocera oleae (Diptera: Tephritidae)

Published online by Cambridge University Press:  05 September 2014

Anne M. Estes*
Affiliation:
Department of Ecology and Evolution, University of Arizona, Tucson, AZ, USA Laboratorio de Genética de Insectos de Importancia Económica, Instituto de Genética “E.A. Favret”, INTA, Castelar, Argentina
Diego F. Segura
Affiliation:
Laboratorio de Genética de Insectos de Importancia Económica, Instituto de Genética “E.A. Favret”, INTA, Castelar, Argentina
Andrew Jessup
Affiliation:
Insect Pest Control Laboratory, FAO/IAEA Agriculture and Biotechnology Laboratories, International Atomic Energy Agency, Wagramer Strasse 5, PO Box 100, A1400Vienna, Austria
Viwat Wornoayporn
Affiliation:
Insect Pest Control Laboratory, FAO/IAEA Agriculture and Biotechnology Laboratories, International Atomic Energy Agency, Wagramer Strasse 5, PO Box 100, A1400Vienna, Austria
Elizabeth A. Pierson
Affiliation:
Department of Horticultural Sciences, Texas A&M University, 2133 TAMU, College Station, TX, USA
*
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Abstract

Mutualistic bacterial endosymbionts provide many benefits to their insect hosts, but their role in mating has not been studied in the past. In this study, we examined copulatory success and mating latency as two parameters of mating success to assess the influence of Candidatus Erwinia dacicola on mating between a laboratory population of olive flies (Bactrocera oleae Rossi) of Israel origin and a wild population of olive flies from Israel. Previous studies have shown that in many species of tephritid flies, laboratory-reared males have lower fitness and achieve fewer matings than wild males. Our research has shown that this Israeli population of olive flies reared in the laboratory on an artificial diet lacked an endosymbiont, Ca. E. dacicola, found in wild-caught insects from Israel. We hypothesized that decreased fitness and mating ability in laboratory-reared flies could be due to the absence of this endosymbiont. Mating assays between both sexes of these two Israeli populations revealed matings to occur primarily between laboratory-reared females and wild males. Laboratory-reared males achieved only 22% of the total matings. Candidatus Erwinia dacicola was found in significantly fewer insects from the laboratory population than in the wild population; within populations, male and female olive flies were equally likely to have the endosymbiont. However, differences in readiness to mate between the two populations, and not the presence of the endosymbiont, explained mating latency.

Type
Research Papers
Copyright
Copyright © ICIPE 2014 

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