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The magnitude of site and time interaction effect in tsetse fly (Diptera: Glossinidae) trap catches

Published online by Cambridge University Press:  10 July 2009

A. Odulaja ,
S. Mihok  and
I.M. Abu-Zinid
A. Odulaja*
Affiliation:
International centre of Insect physiology and ecology (ICIPE), Po Box 30772, Nairobi, Kenya
S. Mihok
Affiliation:
International centre of Insect physiology and ecology (ICIPE), Po Box 30772, Nairobi, Kenya
I.M. Abu-Zinid
Affiliation:
International centre of Insect physiology and ecology (ICIPE), Po Box 30772, Nairobi, Kenya
*
* Fax: 254 2 803360 E-mail: icipe@cgnet.com
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Abstract

Site and time effects are important factors determining trap catches of tsetse flies. These factors may interact significantly and therefore confound interpretation of time series data used for population monitoring. We therefore investigated the magnitude and importance of site × time interactions in trap catches of Glossina pallidipes Austen and G. longipennis Corti using a 2200 trap-days (400 trap-months) data set. The interaction was found to be siginificant (p<0.05) in 46–100% of the combinations of different numbers of months and sites between 2 and 12. The mean percent variance due to the interaction ranged between 4% and 28% for G. pallidipes and 12% and 36% for G.longipennis. The interaction was usually less important than the effect of site alone but more important than the effect of time alone. These results suggest that tsetse researchers should examine critically the adequacy of existing approaches to population monitoring with traps and to testing new traps and odour baits.

Type
Research Article
Information
Bulletin of Entomological Research , Volume 88 , Issue 1 , February 1998 , pp. 59 - 64
Copyright
Copyright © Cambridge University Press 1998

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