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The flight activity of some East African mosquitos (Diptera, Culicidae). I.—Studies on a high steel tower in Zika Forest, Uganda

Published online by Cambridge University Press:  10 July 2009

L. K. H. Goma
L. K. H. Goma
Affiliation:
East African Virus Research Institute, Entebbe, Uganda
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Abstract

A series of forty 24-hour catches was carried out at seven levels (20-ft. intervals from 0 to 120 ft.) on a steel tower in Zika Forest by means of unbaited and unlighted suction traps that acted simply as air samplers. The object was to study the general flight activity of mosquitos in a tropical forest environment from samples that would not be subject to the selective effects exercised by bait-traps and light-traps.

Altogether, 4,151 mosquitos belonging to thirty-four species or species-groups were taken. Eight species, Aedes (Stegomyia) apicoargenteus (Theo.), Mansonia (Coquillettidia) aurites (Theo.), M. (C.) fuscopennata (Theo.), M. (C.) maculipennis (Theo.), M. (C.) metallica (Theo.), M. (C.) pseudoconopas (Theo.), M. (Mansonioides) africana (Theo.) and M. (M.) uniformis (Theo.), were taken in numbers sufficient for detailed analysis. By far the most abundant of these was M. aurites, comprising 55·7 per cent, of the total sample. The remaining twenty-six species together constituted only 7·6 per cent.

Only 144 or 3·5 per cent, of the mosquitos taken were males; and of the females, only 19 or 0.5 per cent. were blood-fed and only 11 or 0·3 per cent, were gravid. Thus, catches in the suction traps consisted almost entirely of unfed non-gravid females. It is tentatively concluded that male mosquitos in the forest are generally very inactive in the absence of stimuli such as lights or baits. The paucity of engorged and gravid females was expected; few of these would come within range of the unlighted unbaited suction traps.

Dissection of 3,072 females belonging to the eight most numerous species showed all to be inseminated. Age-composition was determined in species of Mansonia only; the majority of females in the subgenus Coquillettidia were nulliparous, whereas in the Mansonioides, nulliparous and parous females occurred in roughly equal proportions.

The unlighted, unbaited suction traps caught far fewer mosquitos than did light- and bait-traps under similar conditions.

In general, the vertical distributions and flight-activity cycles of the various species as indicated by the suction-trap catches differed distinctly from those indicated by bait- and light-trap catches reported by other workers. Very little activity was recorded above the forest. Although, in general, activity was irregular, three main patterns could be distinguished: largely nocturnal activity continuing up to about midday but almost completely suppressed in the afternoon, as in M. aurites, M. fuscopennata, M. maculipennis, M. metallica and M. pseudoconopas; activity spread throughout the entire 24-hour period, as in M. africana and M. uniformis; and mainly diurnal activity, as in A. apicoargenteus.

Type
Research Paper
Information
Bulletin of Entomological Research , Volume 56 , Issue 1 , October 1965 , pp. 17 - 35
Copyright
Copyright © Cambridge University Press 1965

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References

Blackmore, J. S. & Dow, R. P. (1962). Nulliparity in summer and fall populations of Culex tarsalis Coq.—Mosq. News 22 pp. 291–294.Google Scholar
Burgess, L. & Haufe, W. O. (1960). Stratification of some prairie and forest mosquitoes in the lower air.—Mosq. News 20 pp. 341–346.Google Scholar
Buxton, A. P. (1952). Observations on the diurnal behaviour of the redtail monkey (Cercopithecus ascanius schmidti Matschie) in a small forest in Uganda.—J. Anim. Ecol. 21 pp. 25–58.CrossRefGoogle Scholar
Corbet, P. S. (1961a). Entomological studies from a high tower in Mpanga Forest, Uganda. VI. Nocturnal flight activity of Culicidae and Tabanidae as indicated by light-traps.—Trans. R. ent. Soc. Lond. 113 pp. 301–314.CrossRefGoogle Scholar
Corbet, P. S. (1961b). Entomological studies from a high tower in Mpanga Forest, Uganda. VIII. The age-composition of biting mosquito populations according to time and level.—Trans. R. ent. Soc. Lond. 113 pp. 336–345.CrossRefGoogle Scholar
Corbet, P. S. (1962). The age-composition of biting mosquito populations according to time and level: a further study.—Bull. ent. Res. 53 pp. 409–416.CrossRefGoogle Scholar
Corbet, P. S. (1963). Seasonal patterns of age-composition of sylvan mosquito populations in Uganda (Diptera, Culicidae).—Bull. ent. Res. 54 pp. 213–227.CrossRefGoogle Scholar
Corbet, P. S. (1964a). Observations on mosquitoes ovipositing in small containers in Zika Forest, Uganda.—J. Anim. Ecol. 33 pp. 141–164.CrossRefGoogle Scholar
Corbet, P. S. (1964b). Nocturnal flight activity of sylvan Culicidae and Tabanidae (Diptera) as indicated by light-traps: a further study.—Proc. R. ent. Soc. Lond. (A) 39 pp. 53–67.Google Scholar
Corbet, P. S. & Haddow, A. J. (1961). Observations on nocturnal flight activity in some African Culicidae (Diptera).—Proc. R. ent. Soc. Lond. (A) 36 pp. 113–118.Google Scholar
Corbet, P. S. & Haddow, A. J. (1962). Diptera swarming above the forest canopy in Uganda, with special reference to Tabanidae.—Trans. R. ent. Soc. Lond. 114 pp. 267–284.CrossRefGoogle Scholar
Corbet, P. S. & Ssenkubuge, Y. (1962). Mosquitoes attracted to various baits in forest.—Rep. E. Afr. Virus Res. Inst. 1961–62 pp. 49–56.Google Scholar
Detinova, T. S. (1962). Age-grouping methods in Diptera of medical importance with special reference to some vectors of malaria.—Monogr. Ser. World Hlth Org. no. 47, 216 pp.Google ScholarPubMed
Gillies, M. T. (1954a). Studies of house-leaving and outside resting of Anopheles gambiae Giles and Anopheles funestus Giles in East Africa. I.—The outside resting population.—Bull. ent. Res. 45 pp. 361–373.CrossRefGoogle Scholar
Gillies, M. T. (1954b). The recognition of age-groups within populations of Anopheles gambiae by the pre-gravid rate and the sporozoite rate.—Ann. trop. Med. Parasit. 48 pp. 58–74.CrossRefGoogle ScholarPubMed
Gillies, M. T. (1957). Age-groups and the biting cycle in Anopheles gambiae. A preliminary investigation.—Bull. ent. Res. 48 pp. 553–559.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. (1960). Studies on the biting habits and medical importance of East African mosquitos in the genus Aëdes. I.—Subgenera Aëdimorphus, Banksinella and Dunnius.—Bull. ent. Res. 50 pp. 759–779.CrossRefGoogle Scholar
Haddow, A. J. (1961a). Entomological studies from a high tower in Mpanga Forest, Uganda. VII. The biting behaviour of mosquitoes and Tabanids.—Trans. R. ent. Soc. Lond. 113 pp. 315–335.CrossRefGoogle Scholar
Haddow, A. J. (1961b). Twenty-four-hour catches on the steel tower.—Rep. E. Afr. Virus Res. Inst. 1960–61 pp. 33–35.Google Scholar
Haddow, A. J. (1964). Twenty-four-hour catches on the tower with man as bait.—Rep. E. Afr. Virus Res. Inst. 1962–63 pp. 42–46.Google Scholar
Haddow, A. J. & Gillett, J. D. (1958). Laboratory observations on the oviposition-cycle in the mosquito Taeniorhynchus (Coquillettidia) fuscopennatus Theobald.—Ann. trop. Med. Parasit. 52 pp. 320–325.CrossRefGoogle ScholarPubMed
Haddow, A. J., Gillett, J. D. & Corbet, P. S. (1961). Removal of steel tower to Zika.—Rep. E. Afr. Virus Res. Inst. 1960–61 pp. 31–32.Google Scholar
Haddow, A. J. & Ssenkubuge, Y. (1962). Catches in the sunset period.—Rep. E. Afr. Virus Res. Inst. 1961–62 pp. 60–61.Google Scholar
Haddow, A. J. & Ssenkubuge, Y. (1963). Studies on the biting habits of East African mosquitos in the genera Uranotaenia, Ficalbia and Hodgesia.—Bull. ent. Res. 53 pp. 639–652.CrossRefGoogle Scholar
Hayes, R. O., Bellamy, R. E., Reeves, W. C. & Willis, M. J. (1958). Comparison of four sampling methods for measurement of Culex tarsalis adult populations.—Mosq. News 18 pp. 218–227.Google Scholar
Kerr, J. A. (1933). Studies on the abundance, distribution and feeding habits of some West African mosquitos.—Bull. ent. Res. 24 pp. 493–510.CrossRefGoogle Scholar
Love, G. J. & Smith, W. W. (1957). Preliminary observations on the relation of light trap collections to mechanical sweep net collections in sampling mosquito populations.—Mosq. News 17 pp. 9–14.Google Scholar
Lumsden, W. H. B. (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. B. (1957). Further development of trap to estimate biting insect attack on small vertebrates.—Rep. E. Afr. Virus Res. Inst. 1956–57 pp. 33–35.Google Scholar
Mattingly, P. F. (1949a). Studies on West African forest mosquitos. Part I.—The seasonal distribution, biting cycle and vertical distribution of four of the principal species.—Bull. ent. Res. 40 pp. 149–168.CrossRefGoogle Scholar
Mattingly, P. F. (1949b). Studies on West African forest mosquitos. Part II.—The less commonly occurring species.—Bull. ent. Res. 40 pp. 387–402.CrossRefGoogle Scholar
Muirhead-Thomson, R. C. (1951). Mosquito behaviour in relation to malaria transmission and control in the tropics.—219 pp. London, E. Arnold & Co.Google Scholar
Murphey, F. J. & Darsie, jr R. F. (1962). Studies on the bionomics of Culex salinarius Coquillett. I. Observations on the crepuscular and nocturnal activities of adult females.—Mosq. News 22 pp. 162–171.Google Scholar
Service, M. W. (1963). The ecology of the mosquitos of the Northern Guinea Savannah of Nigeria.—Bull. ent. Res. 54 pp. 601–632.CrossRefGoogle Scholar
Shemanchuk, J. A., Downe, A. E. R. & Burgess, L. (1963). Hosts of mosquitoes (Diptera: Culicidae) from the irrigated areas of Alberta.—Mosq. News 23 pp. 336–341.Google Scholar
Williams, M. C. (1963). Studies on mosquitos (Diptera, Culicidae) biting birds, using twenty-four-hour catches, in the Entebbe area, Uganda.—Bull, ent. Res. 54 pp. 407–424.CrossRefGoogle Scholar