Studies on the·tsetse flies of the Finchaa River . Valley
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Date
1983-06
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Addis Ababa University
Abstract
A year-round ecological study of G. lrorsitans ugandi.>nsis \<las carried out
fran SeptEmber 1980 to August, 1981 in the Finchaa River Valley in the
\'lestem part of Ethiopia.
Three different sarrpling rrethods, naJ1\31y Vehicle Patrol rrethod, SCre<'.n/
Hand net rrethod and Biconical Traps ~.BrG c1lt'loyed. All were found to be
effective.
The mcno-species ccrnposition, the unimodal seasonal fluctuatien and the
biphasic diel activity of th3 tsetse flies of the area I,~e determined.
The effect of various factors (eg. cl:lIrate, altitude, vcgetatien, etc.)
that interplay with the eeo-distribution of this srecies of tsetse fly
were statistically tested. Conditiens related to teJ\lpGratures, rainfall
vcgetatien and bush-fire affected the fly populatien and distributien.
The apparent dansity (A.D.) was high during and after the rainy seasons
and lo;q during the dry seascn. '.£'he sex ratio indicated that more males
wore captured with the Vehicle Patrol and Screen/Hand net rrethods willIe
the reverse was the case with the Bioonical Traps.
The age structure of the flies sho;*-Xl that roost of the flies loK?re in the
pre-reproductive and reproductive stages.
Obscrvatioos en the physiological conditien of the flies depicted a very
high proportion of hungry flies and a relative]s l<X-l fed and pregrent flies.
Blood-rreal analysis carried out on G.!!!. ugandensis in Finchaa sh<x-.Ed roan,
I·dld pig and war.thog to be tho l1lclin vertr)brate hosts.
The infectien rate of flies in the valley was l<X-l, although a fairly high
infectien rate in cattle was observed en the edge of the eScaJ:j'"llP.nt
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Biology