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Long-term fluctuations in numbers of the tsetse fly Glossina swynnertoni Austen

Published online by Cambridge University Press:  10 July 2009

J. P. Glasgow  and
J. R. Welch
J. P. Glasgow
Affiliation:
East African Trypanosomiasis Research Organization, Tororo, Uganda
J. R. Welch
Affiliation:
East African Trypanosomiasis Research Organization, Tororo, Uganda
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Extract

The tsetse fly population of Block 9 at Shinyanga, Tanganyika, consisting of 40–50 square miles of thorn bush, was studied from 1935 to 1957 by means of fly-rounds with a total length of 30 miles. The mean annual apparent density (A.D.) of Glossina swynnertoni Aust., taken as the geometric mean of the 12 monthly figures, is plotted on a graph covering 23 years, together with data for 1930–36 from another block which, however, is only doubtfully comparable. Four peaks and five troughs occur on the graph of Block 9, the highest value being 18 times the lowest. The history of the natural and artificial events which have occurred in the block are detailed as far as they are known. The minimum A.D. was that of 1938, after a number of wild animals had died of rinderpest; thereafter, the A.D. rose for several years, in spite of certain anti-tsetse measures, and none of the fluctuations subsequent to 1938 can be associated with any natural or artificial event. The amplitude of the fluctuations is small compared with records in the literature for other animal populations, and their occurrence is irregular; the last peak observed was in 1954, but limited observations in 1959 gave catches little, if at all, below those of 1954.

The data were also analysed for seasonal variations. The least monthly mean catch was that of November, the greatest, differing from the least by a factor of only 1·34, that of April. Earlier published accounts of G. morsitans Westw. (based, however, on relatively short periods) give later maxima and greater amplitudes. Annual and seasonal records of the percentage of teneral individuals among male flies and the percentage of females among non-teneral flies are also given, but these data cannot be interpreted at present.

Type
Research Paper
Information
Bulletin of Entomological Research , Volume 53 , Issue 1 , May 1962 , pp. 129 - 137
Copyright
Copyright © Cambridge University Press 1962

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References

Andrewartha, H. G. & Birch, L. C. (1954). The distribution and abundance of animals.—782 pp. Chicago, III., Univ. Chicago Pr.Google Scholar
Bursell, E. & Glasgow, J. P. (1960). Further observations on lake-side and riverine communities of Glossina palpalis fuscipes Newstead.—Bull, ent. Res. 51 pp. 47–56.CrossRefGoogle Scholar
Buxton, P. A. (1955). The natural history of tsetse flies.–Mem. Lond. Sch. Hyg. trop. Med. no. 10, 816 pp. London, Lewis.Google Scholar
Dymond, J. R. (1947). Fluctuations in animal populations with special reference to those of Canada.—Trans, roy. Soc. Can. (3) 41 no. 5, pp. 1–34.Google Scholar
Ford, J., Glasgow, J. P., Johns, D. L. & Welch, J. R. (1959). Transect fly-rounds in field studies of Glossina.—Bull. ent. Res. 50 pp. 275–285.CrossRefGoogle Scholar
Glasgow, J. P. (1960). Shinyanga: a review of the work of the tsetse research laboratory.—E. Afr. agric. For. J. 26 pp. 22–34.Google Scholar
Glasgow, J. P. (1961). The variability of fly-round catches in field studies of Glossina.—Bull. ent. Res. 51 pp. 781–788.CrossRefGoogle Scholar
Glasgow, J. P. & Bursell, E. (1961). Seasonal variations in the fat content and size of Glossina swynnertoni Austen.—Bull. ent. Res. 51 pp. 705–713.CrossRefGoogle Scholar
Glasgow, J. P., Isherwood, F., Lee-Jones, F. & Weitz, B. (1958). Factors influencing the staple food of tsetse flies.—J. Anim. Ecol. 27 pp. 59–69.CrossRefGoogle Scholar
Harley, J. M. B. (1960). A review of entomological research carried out by East African Trypanosomiasis Research Organization.—Rep. 7th Commonw. ent. Conf. 1960 pp. 246–252.Google Scholar
Harrison, H. (1986). The Shinyanga game experiment: a few of the early observations.—J. Anim. Ecol. 5 pp. 271–293.CrossRefGoogle Scholar
Jackson, C. H. N. (1937). Some new methods in the study of Glossina morsitans.—Proc.zool. Soc. 1936 pp. 811–896.Google Scholar
Jackson, C. H. N. (1945). Comparative studies of the habitat requirements of tsetse fly species.—J. Anim. Ecol. 14 pp. 46–51.CrossRefGoogle Scholar
Jackson, C. H. N. (1946). An artificially isolated generation of tsetse flies (Diptera).—Bull. ent. Res. 37pp. 291–299.CrossRefGoogle ScholarPubMed
Jackson, C. H. N. (1948). Some further isolated generations of tsetse flies.—Bull. ent. Res. 39pp. 441–451.CrossRefGoogle ScholarPubMed
Nash, T. A. M. (1933). The ecology of Glossina morsitans, Westw., and two possible methods for its destruction.—Bull. ent. Res. 24 pp. 107–157. 163–195.CrossRefGoogle Scholar
Potts, W. H. (1940). The tsetse position at Shinyanga with special regard to the Shinyanga-Kahama fire-exclusion experiment.—Tsetse Res. Rep. Tanganyika, 1935–38 pp. 19–26.Google Scholar
Potts, W. H. (1950). Tsetse research.—Rep. E. Afr. Tsetse Res. Reel. Org. 1950 pp. 11–33.Google Scholar
Swynnerton, C. F. M. (1936), The tsetse flies of East Africa. A first study of their ecology, with a view to their control.—Trans. R. ent. Soc. Lond. 84 579 pp.Google Scholar
Welch, J. R. (1959). Observations on the vegetation of Block 9, Shinyanga, Tanganyika.—Rep. E. Afr. Tryp. Res. Org. 1958 pp. 64–67.Google Scholar