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Spatial and temporal distribution of tsetse fly trap catches at Nguruman, southwest Kenya

Published online by Cambridge University Press:  09 March 2007

A. Odulaja ,
J. Baumgärtner ,
S. Mihok  and
I.M. Abu-Zinid
A. Odulaja*
Affiliation:
International Centre of Insect Physiology and Ecology (ICIPE), PO Box 30772, Nairobi, Kenya
J. Baumgärtner
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 860110 E-mail: [email protected]
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Abstract

Spatial and temporal dynamics of rapidly growing populations of tsetse flies at Nguruman, southwest Kenya during 1993–1995, were investigated, following six years of intensive population suppression with traps over a c. 100 km2area. The two tsetse species present were randomly distributed in the short rainy season, but were aggregated in the dry and long rainy seasons. Maximum temperature was the dominant weather factor associated with the degree of aggregation. Trends in catches at 20 fixed sites along an 18 km north–south axis were weakly correlated between locations, possibly representing population sub-structuring. In particular, trends in population change were poorly correlated between the area with a long history of trapping suppression in the south and the area with a more recent history of suppression in the north. On a micro-geographic scale, correlations among paired trap catches were clearly related to geographical proximity for Glossina pallidipes Austen (r2 = 0.55); whereas this relationship was quite weak for Glossina longipennis Corti (r2 = 0.12). Positive correlations among trap catches were significant for sites separated by less than c. 3.8 km (G. pallidipes) or 4.8 km (G. longipennis). These results suggest the existence of different population substructures in the two species on a relatively small geographic scale.

Type
Research Article
Information
Bulletin of Entomological Research , Volume 91 , Issue 3 , June 2001 , pp. 213 - 220
Copyright
Copyright © Cambridge University Press 2001

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