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Dominance of an invasive fruit fly species, Bactrocera invadens, along an altitudinal transect in Morogoro, Eastern Central Tanzania

Published online by Cambridge University Press:  03 February 2014

K. Geurts ,
M.W. Mwatawala  and
M. De Meyer
K. Geurts*
Affiliation:
Terrestrial Ecology Unit, Faculty of Sciences, Ghent University, K.L. Ledeganck Straat 35, 9000 Gent, Belgium
M.W. Mwatawala
Affiliation:
Department of Crop Science and Production, Sokoine University of Agriculture, P.O. Box 3000, Chuo Kikuu, Morogoro, Tanzania
M. De Meyer
Affiliation:
Entomology Section, Royal Museum for Central Africa, Leuvensesteenweg 13, 3080 Tervuren, Belgium
*
*Author for correspondence Phone: +32 498620815 Fax: +32 27695432 E-mail: katrien.geurts@my.jcu.edu.au
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Abstract

Bactrocera invadens, a fruit fly from Asia, is an invasive pest species across Africa. It appears to continue spreading, not only in latitude but also in altitude. To assess its capacity to infest a large variety of hosts and its competition with other fruit fly species, a study along an altitudinal gradient was conducted. At low altitudes, the high abundance in the field and high infestation of B. invadens in different fruit species make it a serious pest. At high altitudes, colonization has started and B. invadens occurs in low numbers by reproducing successfully in high altitude fruits. Overall the abundance and infestation of B. invadens is influenced by its direct competitor Ceratitis rosa and the presence of its preferred host species. C. rosa is still the dominant species in temperate fruits grown at high altitude. Ceratitis cosyra, however, is negatively affected by B. invadens, this species seems to have shifted hosts to avoid competition. The broad host range and competitive potential of B. invadens increase the risk for further spread not only to higher areas, but also to subtropical regions.

Keywords

CeratitisBactrocerainter-specific competitionhost range
Type
Research Paper
Information
Bulletin of Entomological Research , Volume 104 , Issue 3 , June 2014 , pp. 288 - 294
Copyright
Copyright © Cambridge University Press 2014 

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