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Seasonal Variations in the Mean Size of Tsetse Flies

Published online by Cambridge University Press:  10 July 2009

C. H. N. Jackson
C. H. N. Jackson
Affiliation:
East African Tsetse & Trypanosomiasis Research and Reclamation Organisation.
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Extract

The mean size of the males of the three tsetse species Glossina pallidipes, G. morsitans and G. swynnertoni is negatively correlated with the mean 2 p.m. saturation deficit of 2 months before.

The correlation is highest (—0·90) for G. pallidipes, the largest species, and lowest for G. swynnertoni, the smallest. The variation coefficient of mean vein length also is highest for G. pallidipes and lowest for G. swynnertoni.

The reason for the apparent 2 months' lag in the effect of saturation deficit on size of flies is that the mean male pupal period is 35 days in Shinyanga (23°C.) and the mean age of males measured is 3–4 weeks. If 1 month's lag is tried, the correlation for G. pallidipes drops from —0·90 to —0·32, and with no lag at all it is —0·24. The correlation with maximum temperature of 2 months earlier is insignificantly lower than that with saturation deficit; it is —0·79 for G. pallidipes.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 43 , Issue 4 , January 1953 , pp. 703 - 706
Copyright
Copyright © Cambridge University Press 1953

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References

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