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Observations on the Mosquito, Aëdes (Stegomyia) aegypti (L.), in East Africa. II.—The Biting Cycle in a Domestic Population on the Kenya Coast

Published online by Cambridge University Press:  10 July 2009

G. A. H. McClelland
G. A. H. McClelland
Affiliation:
East African Virus Research Institute, Entebbe, Uganda.
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Extract

Since the sharply defined biting cycle shown by outdoor populations, in Uganda, of Aëdes aegypti (L.), which closely resembles oviposition and general activity rhythms, could not be reconciled with the ill-defined patterns found in domestic populations, on the Kenya coast, in the absence of knowledge of the composition of the population involved there, 24-hour baited catches were made at Ganda on the Kenya coast, and the abdominal colour pattern of each individual was noted. In the series there was gradation from the darkest to the palest.

Of 427 females taken biting, 82·1 per cent, were of var. queenslandensis (Theo.) in the generally accepted sense, 14·5 per cent, of the type form and 0·9 per cent, of subsp. formosus (Wlk.). The material of var. queenslandensis was further divided into two groups in which the lateral spots on the abdominal tergites were of silver and matt white scales, respectively.

Very similar biting cycles, with the main peak in the hour before sunset, occurred both inside a hut and within an adjacent compound, although catches were not concurrent and were made under different seasonal conditions.

The distribution of the various colour forms in the total catch was independent of the hour of capture.

There is a resemblance between these cycles and those reported in comparable situations in Nigeria, where, with the exception of the paler forms, the population of A. aegypti is similar to that at Ganda. It is concluded that the main biting peak is shortly before sunset. Subsidiary peaks, when present, occur with increasing intensity as the day progresses.

The relationship of biting activity to other aspects of general activity is discussed, and it is concluded that several aspects require further investigation.

The following hypothesis is offered to account for the various patterns of biting cycle observed in different situations. It is suggested that A. aegypti possesses an endogenous multi-peaked diel rhythm of activity. Activity impulses occur in a cycle of waves of increasing intensity from dawn onwards, reaching a maximum at the end of the daylight period, and a biting peak will result when such an impulse coincides with environmental conditions within the range between upper and lower thresholds of activity.

Type
Research Paper
Information
Bulletin of Entomological Research , Volume 50 , Issue 4 , January 1960 , pp. 687 - 696
Copyright
Copyright © Cambridge University Press 1960

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References

Boorman, J. P. T. [1958]. Studies on the biting habits of adult mosquitoes at Ilobi.—Rep. W. Afr. Coun. med. Res. 1957 pp. 34–96.Google Scholar
Bugher, J. C. [1949]. Responses of mosquitoes to changes in microclimate.—Rep. Yell. Fever Res. Inst. Lagos 1948 pp. 166–175.Google Scholar
Colless, D. H. (1957). Components of the catch curve of Culex annulus.—Nature, Lond. 180 pp. 1496–1497.CrossRefGoogle ScholarPubMed
Davies, L. (1957). Study of the age of females of Simulium ornatum Mg. (Diptera) attracted to cattle.—Bull. ent. Res. 48 pp. 535–552.CrossRefGoogle Scholar
Gillett, J. D., Corbet, P. S. & Haddow, A. J. (1959). Observations on the oviposition-cycle of Aëdes (Stegomyia) aegypti (Linnaeus), III.—Ann. trop. Med. Parasit. 53 pp. 132–136.CrossRefGoogle ScholarPubMed
Gillett, J. D. & Haddow, A. J. (1957). Laboratory observations on the ovi-position-cycle in the mosquito Aëdes (Stegomyia) africanus Theobald.—Ann. trop. Med. Parasit. 51 pp. 170–174.CrossRefGoogle Scholar
Gillett, J. D., Haddow, A. J. & Corbet, P. S. (1959). Observations on the oviposition-cycle of Aëdes (Stegomyia). aegypti (Linnaeus), II.—Ann. trop. Med. Parasit. 53 pp. 35–41.CrossRefGoogle Scholar
Haddow, A. J. (1942). The mosquito fauna and climate of native huts at Kisumu, Kenya.—Bull. ent. Res. 33 pp. 91–142.CrossRefGoogle Scholar
Haddow, A. J. (1945). The mosquitoes of Bwamba County, Uganda. II. Biting activity with special reference to the influence of microclimate.—Bull. ent. Res. 36 pp. 33–73.CrossRefGoogle Scholar
Haddow, A. J. (1954). Studies of the biting-habits of African mosquitoes. An appraisal of methods employed, with special reference to the twenty-four-hour catch.—Bull. ent. Res. 45 pp. 199–242.CrossRefGoogle Scholar
Haddow, A. J. & Gillett, J. D. (1957). Observations on the oviposition-cycle of Aëdes (Stegomyia) aegypti (Linnaeus).—Ann. trop. Med. Parasit. 51 pp. 159–169.CrossRefGoogle ScholarPubMed
Haddow, A. J.Gillett, J. D. & Highton, R. B. (1947). The mosquitoes of Bwamba County, Uganda. V. The vertical distribution and biting-cycle of mosquitoes in rain-forest, with further observations on microclimate.—Bull. ent. Res. 37 pp. 301–330.CrossRefGoogle Scholar
Harker, J. E. (1958). Diurnal rhythms in the animal kingdom.—Biol. Rev. 33 pp. 1–52.CrossRefGoogle Scholar
Lewis, D. J. (1957). Aspects of the structure, biology and study of Simulium damnosum.—Ann. trop. Med. Parasit. 51 pp. 340–358.CrossRefGoogle ScholarPubMed
Lewis, D. J. (1958). Observations on Simulium damnosum Theobald at Lokoja in Northern Nigeria.—Ann. trop. Med. Parasit. 52 pp. 216–231.CrossRefGoogle ScholarPubMed
Lumsden, W. H. R. (1952). The crepuscular biting activity of insects in the forest canopy in Bwamba, Uganda. A study in relation to the sylvan epidemiology of yellow fever.—Bull. ent. Res. 42 pp. 721–760.CrossRefGoogle Scholar
Lumsden, W. H. R. (1955). An epidemic of virus disease in Southern Province, Tanganyika Territory, in 1952—53. II. General description and epidemiology.—Trans. R. Soc. trop. Med. Hyg. 49 pp. 33–57.CrossRefGoogle ScholarPubMed
Lumsden, W. H. R. (1957). The activity cycle of domestic Aëdes (Stegomyia) aegypti (L.) (Dipt., Culicid.) in Southern Province, Tanganyika.—Bull. ent. Res. 48 pp. 769–782.CrossRefGoogle Scholar
McClelland, G. A. H. (1959). Observations on the mosquito, Aëdes (Stegomyia) aegypti (L.), in East Africa. I. The biting cycle in an outdoor population at Entebbe, Uganda.—Bull. ent. Res. 50 pp. 227–235.CrossRefGoogle Scholar
Macdonald, W. W. (1956). Aëdes aegypti in Malaya. II. Larval and adult biology.—Ann. trop. Med. Parasit. 50 pp. 399–414.CrossRefGoogle ScholarPubMed
Mattingly, P. F. (1949). Studies on West African forest mosquitos. Part II. The less commonly occurring species.—Bull. ent. Res. 40 pp. 387–402.CrossRefGoogle Scholar
Mattingly, P. F. (1957). Genetical aspects of the Aëdes aegypti problem. I. Taxonomy and bionomics.—Ann. trop. Med. Parasit. 51 pp. 392–408.CrossRefGoogle Scholar
Morlan, H. B. & Hayes, R. O. (1958). Urban dispersal and activity of Aëdes aegypti.—Mosq. News 18 pp. 137–144.Google Scholar
Van Someren, E. C. C., Heisch, R. B. & Furlong, M. (1958). Observations on the behaviour of some mosquitos of the Kenya coast.—Bull. ent. Res. 49 pp. 643–660.CrossRefGoogle Scholar
Teesdale, C. (1955). Studies on the bionomics of Aëdes aegypti (L.) in its natural habitats in a coastal region of Kenya.—Bull. ent. Res. 46 pp. 711–742.CrossRefGoogle Scholar
Wellington, W. G. (1945). The effect of ground temperature inversions upon the flight activity of Culex sp. (Diptera, Culicidae).—Canad. Ent. 76 p. 223.Google Scholar