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Climate, the vital Factor in the Ecology of Glossina

Published online by Cambridge University Press:  10 July 2009

T. A. M. Nash
T. A. M. Nash
Affiliation:
Entomologist, Sleeping Sickness Service, Nigerian Medical Department.
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Extract

The Seasonal Factor.

1. The period of stress due to extreme climatic conditions is far shorter in the forest than in the meadow-pan.

2. G. tachinoides is primarily dependent upon riverine vegetation or residual forest, and has only a very limited wet season spread. G. submorsitans is primarily an open woodland fly with great powers of dispersal which are annually checked by adverse climate that enforces a temporary dependence upon the riverine forests.

3. G. tachinoides abounds within the stream-bed or residual forest ; G. submorsitans abounds on the forest fringe.

4. The dispersal of both species is closely associated with evaporation and saturation deficiency. A mean monthly evaporation of 20–28 cc. and a saturation deficiency of 5 to 8 millibars results in maximal dispersal ; dispersal yields to concentration as the evaporative power of the air increases above these zones.

5. The extent of the annual dispersal is indirectly governed by the duration of the wet season—the longer the season the more extensive the dispersal.

6. The population of G. submorsitans steadily increases throughout the rains as the evaporation falls, and becomes maximal towards the end when the evaporation is in the optimum zone (20—25 cc.) ; density steadily falls throughout the dry season as evaporation rises, and becomes minimal at the end when evaporation is maximal. G. tachinoides is believed to behave similarly, but the optimum zone of evaporation is probably about 6 to 10 cc.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 28 , Issue 1 , March 1937 , pp. 75 - 127
Copyright
Copyright © Cambridge University Press 1937

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References

Austen, E. E. & Hegh, E. (1922). Tsetse-flies : their characteristics, distribution and bionomics.—Imp. Bur. Ent., 188 pp.Google Scholar
Buxton, P. A. & Lewis, D. J. (1934). Climate and tsetse-flies : Laboratory studies upon Glossina submorsitans and tachinoides.—Philos. Trans. Roy. Soc. London (B) 224, pp. 175–240.Google Scholar
Chorley, J. K. (1929). The bionomics of Glossina morsitans in the Umniati Fly Belt, Southern Rhodesia, 1922–23.—Bull. Ent. Res. 20, pp. 279–301, 5 figs.Google Scholar
Hegh, E. (1929). Les Tsé-tsés, I. Bruxelles., xiv + 742 pp.Google Scholar
Jackson, C. H. N. (1930). Contributions to the bionomics of Glossina morsitans.—Bull. Ent. Res. 21, p. 491.CrossRefGoogle Scholar
Jackson, C. H. N. (1933). The causes and implications of hunger in Tsetse-fiies.—Bull. Ent. Res. 24, p. 443.CrossRefGoogle Scholar
Johnson, W. B. & Lloyd, Ll. (1923). First report of the tsetse-fiy investigation in the Northern Provinces of Nigeria.—Bull. Ent. Res. 13, p. 373.CrossRefGoogle Scholar
Lamborn, W. A. (1915). Second report on Glossina investigations in Nyasaland.—Bull. Ent. Res. 6, p. 249.Google Scholar
Lloyd, Ll., Johnson, W. B., Young, W. A. & Morrison, H. (1924).—Bull. Ent. Res. 15, p. 1.CrossRefGoogle Scholar
Morris, K. R. S. (1934). The Bionomics of G. longipalpis.—Bull. Ent. Res. 25, p. 309.Google Scholar
Nash, T. A. M. (1930). A contribution to our knowledge of the bionomics of Glossina morsitans.—Bull. Ent. Res. 21, p. 201 (map).Google Scholar
Nash, T. A. M. (1931). The relationship between Glossina morsitans and the evaporation rate.—Bull. Ent. Res. 22, p. 383.CrossRefGoogle Scholar
Nash, T. A. M. (1933 a). The ecology of Glossina morsitans, Westw., and two possible methods for its destruction.—Bull. Ent. Res. 24, pp. 107–157, 163–195.CrossRefGoogle Scholar
Nash, T. A. M. (1933 b). A statistical analysis of the climatic factors influencing the density of tsetse flies, Glossina morsitans, Westw.—J. Anim. Ecol. 2, pp. 197–203.CrossRefGoogle Scholar
Nash, T. A. M. (1935). The effect of high maximum temperatures upon the longevity of Glossina submorsitans, Newst., and G. tachinoides, Westw.—Bull. Ent. Res. 26, p. 103.CrossRefGoogle Scholar
Nash, T. A. M. (1936 a) The part played by microclimates in enabling G. submorsitans and G. tachinoides to withstand the high temperatures of a West African dry season.—Bull. Ent. Res. 27, p. 339.Google Scholar
Nash, T. A. M. (1936 b). The relationship between the maximum temperature and the seasonal longevity of G. submorsitans, Newst., and G. tachinoides, Westw., in Northern Nigeria.—Bull. Ent. Res. 27, p. 273.CrossRefGoogle Scholar
Newstead, R., Evans, A. M. & Potts, W. H. (1924). Guide to the study of tsetse flies.—Liverpool School Trop. Med. Memoir (N.S.), No. 1.Google Scholar
Pomeroy, A. W. J. & Morris, K. R. S. (1932). The tsetse problem on the eastern cattle route in the Gold Coast.—Bull. Ent. Res. 23, p. 501.CrossRefGoogle Scholar
Taylor, A. W. (1932). Pupal parasitism in Glossina morsitans and G. tachinoides at Gadau, Northern Nigeria.—Bull. Ent. Res. 23, p. 463.Google Scholar