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Further studies on age and trypanosome infection rates in Glossina pallidipes Aust., G. palpalis fuscipes Newst. and G. brevipalpis Newst. in Uganda

Published online by Cambridge University Press:  10 July 2009

J. M. B. Harley
J. M. B. Harley
Affiliation:
East African Trypanosomiasis Research Organization, Tororo, Uganda
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Extract

Between June 1964 and May 1965, samples of Glossina pallidipes Aust., G. palpalis fuscipes Newst. and G. brevipalpis Newst. were caught in an area on the north-eastern shore of Lake Victoria in Uganda. Both males and females were classified into age-categories according to the degree of wear of the wings. Females were also classified into ovarian age-categories according to the exact or approximate number of ovulations that had taken place. All were examined for presence of infections with Trypanosoma, which were classified as vivax-type, congolense-type or brucei-type according to their location in the flies.

The percentage compositions of the samples by wing-fray category are compared. The mean wing-fray category of females of G. palpalis fuscipes and G. brevipalpis was somewhat lower, and that of females of G. pallidipes somewhat higher, than that of the corresponding males. However, the figures for infection rate in females of all three species were higher than in the corresponding males, significantly so in G. pallidipes and G. palpalis fuscipes, and it seems probable that the mean age of females, at least of the two latter species, was greater than that of males. Among females, the range of calendar ages of flies in the various fray categories was wide.

The physiological age-determination method, in which females older than about 42 days are classified iDto four age-categories, does not extend sufficiently far to give a reasonable pattern for the age-composition of any of the species at Lugala, and many of the individuals caught must have been more than about 80 days old.

Seasonal fluctuations in mean wing-fray and in the proportion of old flies in the population were correlated with changes in infection rate of females of G. palpalis fuscipes but not of females of G. pallidipes. Among males of neither species were seasonal fluctuations in mean fray correlated with changes in infection rate, though among those of G. palpalis fuscipes the two varied similarly between June and February.

Females of G. pallidipes and G. palpalis fuscipes about 31–42 days old had significantly fewer brucei-type infections than those over 42 days old, and either the developmental cycle in the field must normally be longer than that recorded in laboratory investigations or many of the flies must become infected when more than just a few days old.

Type
Research Paper
Information
Bulletin of Entomological Research , Volume 57 , Issue 3 , November 1967 , pp. 459 - 477
Copyright
Copyright © Cambridge University Press 1967

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References

Buxton, P. A. (1955). The natural history of tsetse flies.—Mem. Lond. Sch. Hyg. trop. Med. no. 10, 816 pp.Google Scholar
Challier, A. (1965). Amélioration de la méthode de détermination de l’age physiologique des Glossines. Etudes faites sur Glossina palpalis gambiensis Vanderplank, 1949.—Bull. Soc. Path. exot. 58 pp. 250–259.Google Scholar
Duke, H. L. (1933). Studies on the factors that may influence the transmission of the polymorphic trypanosomes by tsetse. VI. On the duration of the biological cycle in Glossina.—Ann. trop. Med. Parasit. 27 pp. 451–467.CrossRefGoogle Scholar
Fairbairn, H. & Burtt, E. (1946). The infectivity to man of a strain of Trypanosoma rhodesiense transmitted cyclically by Glossina morsitans through sheep and antelope: evidence that man requires a minimum infective dose of metacyclic trypanosomes.—Ann trop. Med. Parasit. 40 pp. 270–313.CrossRefGoogle Scholar
Fairbairn, H. & Culwick, A. T. (1950). The transmission of the polymorphic trypanosomes.—Acta trop. 7 pp. 21–47.Google Scholar
Gillies, M. T. & Wilkes, T. J. (1965). A study of the age-composition of populations of Anopheles gambiae Glies and A. funestus Glies in north-eastern Tanzania.—Bull. ent. Res. 56 pp. 237–262.CrossRefGoogle Scholar
Glasgow, J. P. (1961). The feeding habits of Glossina swynnertoni Austen.—J. Anim. Ecol. 30 pp. 77–85.CrossRefGoogle Scholar
Harley, J. M. B. (1965a). Activity cycles of Glossina pallidipes Aust., G. palpalis fuscipes Newst. and G. brevipalpis Newst.—Bull. ent. Res. 56 pp. 141–160.CrossRefGoogle Scholar
Harley, J. M. B. (1965b). Studies on the hunger cycle of G. pallidipes at Lungala.—Rep. E. Afr. Trypan. Res. Org. 1963–1964 p. 50.Google Scholar
Harley, J. M. B. (1966a). Seasonal and diurnal variations in physiological age and trypanosome infection rate of females of Glossina pallidipes Aust., G. palpalis fuscipes Newst. and G. brevipalpsis Newst.—Bull. ent. Res. 56 pp. 595–614.CrossRefGoogle Scholar
Harley, J. M. B. (1966b). Studies on age and trypanosome infection rate of females of Glossina pallidipes Aust., G. palpalis fuscipes Newst. and G. brevipalpis Newst. in Uganda.—Bull. ent. Res. 57 pp. 23–37.CrossRefGoogle Scholar
Jackson, C. H. N. (1946). An artificially isolated generation of tsetse files (Diptera).—Bull. ent. Res. 39 pp. 291–299.CrossRefGoogle Scholar
Jackson, C. H. N. (1948). Some further isolated generations of tsetse flies.—Bull. ent. Res. 39 pp. 441–451.CrossRefGoogle ScholarPubMed
Jackson, C. H. N. (1949). The biology of tsetse files.—Biol. Rev. 24 pp. 174–199.CrossRefGoogle Scholar
Leggate, B. M. (1962). Trypanosome infections in Glossina morsitans Westw. and G. pallidipes Aust. under natural conditions.—9th Meet. int. sci. Comm. Trypan. Res., 1962 pp. 213–227.Google Scholar
Nash, T. A. M. & Page, W. A. (1953). The ecology of Glossina palpalis in Northern Nigeria.—Trans. R. ent. Soc. Lond. 104 pp. 71–169.Google Scholar
Pires, F. A., Marques Da Silva, J. M. & Teles E Cunha, J. (1950). Posicso actual da tsétsé na área da Sitatonga circunscricao do Mossurize. Estudo comparativo da infestacao por tripanossomas patogénicos nas G. morsitans, G. pallidipes, G. brevipalpis e G. austeni.—Mocambique no. 62 pp. 1–59.Google Scholar
Robertson, M. (1913). Notes on the life-history of Trypanosoma gambiense, with a brief reference to the cycles of Trypanosoma nanum and Trypanosoma pecorum in Glossina palpalis.—Phil. Trans. R. Soc. (B) 203 pp. 161–184.Google Scholar
Saunders, D. S. (1962). Age determination for female tsetse flies and the age compositions of samples of Glossina pallidipes Aust., G. palpalis fuscipes Newst. and G. brevipalpis Newst.—Bull. ent. Res. 53 pp. 579–595.CrossRefGoogle Scholar
Vanderplank, F. L. (1947). Seasonal and annual variation in the incidence of trypanosomiasis in game.—Ann. trop. Med. Parasit. 41 pp. 365–374.CrossRefGoogle ScholarPubMed
Wijers, D. J. (1958). Factors that may influence the infection rate of Glossina palpalis with Trypanosoma gambiense. I. The age of the fly at the time of the infected feed.—Ann. trop. Med. Parasit. 52 pp. 385–390.CrossRefGoogle ScholarPubMed