Age determination for female tsetse flies and the age compositions of samples of Glossina pallidipes Aust., G. palpalis fuscipes Newst. and G. brevipalpis Newst. | Bulletin of Entomological Research | Cambridge Core (original) (raw)

Extract

The age compositions of samples of females of Glossina pallidipes Aust., G. palpalis fuscipes Newst. and G. brevipalpis Newst., are analysed by means of a method of age determination based upon the changes occurring in the reproductive system during successive gonotrophic cycles. This method of age determination is described in detail.

Females were sampled by three main methods: in traps, by catching on a bait-animal, and on a fly-round. Some flies were also found as resting flies in the undergrowth.

Trap-caught samples of G. pallidipes were older (i.e.), contained a larger proportion of old flies (and a smaller proportion of young flies) than the hand-caught samples. The bait-caught samples were intermediate in age structure. Correlated with the increasing mean age in the hand-caught—bait-caught—trap-caught series was an increase in the proportion of females carrying third-instar larvae and a decrease in the proportion of those carrying eggs. Results with samples of G. palpalis fuscipes and G. brevipalpis were not so well defined.

The results of dissecting teneral and non-teneral nullipars of G. pallidipes and G. palpalis fuscipes indicate that females of the latter are inseminated some time before they take their first blood-meal, but teneral females of G. pallidipes are inseminated when they come to the host to feed or after they have fed.

The relation of the ovarian method of age determination to Jackson's (1946) wing-fray categories in females of G. pallidipes, and the probable epidemiological importance of the samples, are also discussed.

References

Beklemishev, W. N. [V. N.], Detinova, T. S. & Polovodova, V. P. (1959). Determination of physiological age in Anophelines and of age distribution in Anopheline populations in the USSR.—Bull. World Hlth Org. 21 pp. 223–232.Google ScholarPubMed

Bertram, D. S. & Samarawickrema, W. A. (1958). Age determination for individual Mansonioides mosquitoes.—Nature, Lond. 182 pp. 444–446.CrossRefGoogle ScholarPubMed

Bursell, E. (1961). The behaviour of tsetse flies (Glossina swynnertoni Austen) in relation to problems of sampling.—Proc. R. ent. Soc. Lond. (A) 36 pp. 9–20.Google 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

Cockings, K. L. (1960). Laboratory maintenance of Glossina pallidipes.—Rep. E. Afr. Tryp. Res. Org. 1959 pp. 13–18.Google Scholar

Detinova, T. S. (1949). Physiological changes of ovaries in females of Anopheles maculipennis. [In Russian.]—Med. Parazit. 18 p. 410. (Cited in Detinova, 1959.)Google Scholar

Detinova, T. S. (1959). Age grouping methods in Diptera of medical importance. Course in advanced entomological techniques applied to malaria eradication.—WHO/Mal/238.Google Scholar

Gillies, M. T. (1958). A review of some recent Russian publications on the technique of age determination in Anopheles.—Trop. Dis. Bull. 55 pp. 713–721.Google ScholarPubMed

Harris, R. H. T. P. (1932). Some facts and figures regarding the attempted control of Glossina pallidipes in Zululand.—S. Afr. J. Sci. 29 pp. 495–507.Google Scholar

Isherwood, F. (1957). The resting sites of Glossina swynnertoni Aust. in the wet season.—Bull. ent. Res. 48 pp. 601–606.CrossRefGoogle Scholar

Jack, R. W. (1939). Studies in the physiology and behaviour of Glossina morsitans, Westw.—Mem. Dep. Agric. S. Rhod. no. 1, 203 pp.Google Scholar

Jack, R. W. (1941). Further studies in the physiology and behaviour of Glossina morsitans, Westw.—Mem. Dep. Agric. S. Rhod. no. 3, 54 pp.Google Scholar

Jackson, C. H. N. (1933a). The causes and implications of hunger in tsetse-flies.—Bull. ent. Res. 24 pp. 443–482.CrossRefGoogle Scholar

Jackson, C. H. N. (1933b). On a method of marking tsetse flies.—J. Anim. Ecol. 2 pp. 289–290.CrossRefGoogle Scholar

Jackson, C. H. N. (1946). An artificially isolated generation of tsetse flies (Diptera).—Bull. ent. Res. 37 pp. 291–299.CrossRefGoogle ScholarPubMed

Mellanby, H. (1937). Experimental work on reproduction hi the tsetse fly, Glossina palpalis.—Parasitology 29 pp. 131–141.CrossRefGoogle Scholar

Mellanby, K. (1936). Experimental work with the tsetse-fly, Glossina palpalis, in Uganda.—Bull. ent. Res. 27 pp. 611–632.CrossRefGoogle Scholar

Mellanby, K. (1937). The reproductive cycle in Glossina morsitans and Glossina swynnertoni.—Parasitology 29 p. 142.CrossRefGoogle Scholar

Morris, K. R. S. (1960). Trapping as a means of studying the game tsetse, Glossina pallidipes Aust.—Bull. ent. Res. 51 pp. 533–557.CrossRefGoogle Scholar

Nash, T. A. M. (1955). The fertilisation of Glossina palpalis in captivity.—Bull, ent. Res. 46 pp. 357–368.CrossRefGoogle Scholar

Polovodova, V. P. (1947). Age changes in the female reproductive system of Anopheles and age composition of mosquito populations. [In Russian.] Thesis, Rostov-on-Don. (Cited in Detinova, 1959.)Google Scholar

Saunders, D. S. (1960b). Determination of physiological age for female Glossina morsitans.—Nature, Lond. 186 p. 651.CrossRefGoogle ScholarPubMed

Saunders, D. S. (1960c). The ovulation cycle in Glossina morsitans Westwood (Diptera: Muscidae) and a possible method of age determination for female tsetse flies by the examination of their ovaries.—Trans. R. ent. Soc. Lond. 112 pp. 221–238.CrossRefGoogle Scholar

Smith, I. M. & Rennison, B. D. (1961). Studies of the sampling of Glossina pallidipes Aust. I. The numbers caught daily on cattle, in Morris traps and on a fly-round.—Bull. ent. Res. 52 pp. 165–182.CrossRefGoogle Scholar

Symes, C. B. & Southby, R. (1938). The reduction of G. palpalis in a lake shore area by the “block” method. Nairobi. (Cited in Buxton, 1955.)Google Scholar

Vanderplank, F. L. (1947). Experiments in the hybridisation of tsetse-flies (Glossina, Diptera) and the possibility of a new method of control.—Trans. R. ent. Soc. Lond. 98 pp. 1–18.CrossRefGoogle Scholar