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Morphometrics of Larvae of Aedes (Stegomyia) Simpsoni Complex (Diptera: Culicidae) in Uganda

Published online by Cambridge University Press:  19 September 2011

A. Miyingo-Kezimbira  and
J. J. Lutwama
A. Miyingo-Kezimbira
Affiliation:
Department of Zoology, Makerere University, P. O. Box 7062, Kampala, Uganda
J. J. Lutwama
Affiliation:
Uganda Virus Research Institute, P. O. Box 49, Entebbe, Uganda
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Abstract

Various morphological characters of larvae of Aedes (Stg.) simpsoni complex collected from different localities in Uganda were studied in an attempt to characterise the species in the Ae. simpsoni complex. Morphometrics of larval characters revealed wide ranges of variation most of which separated or grouped populations. Multivariate discriminant analysis and principal component analysis discriminated between different populations. In some populations the males were fairly distinct from the females, while for some characters the populations overlapped considerably. The percent variability of each character alone is low and does not separate the species of the complex. However several characters correlated. Length of antennae (LANT), length of antennae up to Seta 1–4 (LANT4), length of head (LHEAD), and length of siphon up to position of Seta 1-S (LSIPHSET1S) showed fairly significant variability which could be used in conjunction with characters of pupae and adults to separate populations. In the wild we find anthropophilic and non-anthropophilic populations of the mosquitoes, especially in Colocasia plants, bananas (Musa sp.), Dracaenia and Ananas sp. The multivariate analysis carried out could not separate the populations into biting behaviour groups nor breeding habitat groups.

Résumé

Différents caractères morphologiques des larves du complexe d'espèces Aedes (Stg.) simpsoni, récoltées dans différentes localités d'Ouganda ont été étudiées afin de différencier les espèces. L'étude morphométrique des caractères larvaires révèle une large échelle de variation permettant de séparer ou regrouper les populations. Une analyse discriminante multivariée et une analyse en composante principale permettent de séparer les populations. Dans certaines populations les mâles sont bien différents des femelles, alors que pour certains caractères les populations se superposent énormément. Le pourcentage de variation de chacun des caractères seuls est faible et ne permet pas de séparer les différentes espèces du complexe. Cependant plusieurs caractères corrélés entre eux la longueur de l'antenne (LANT), la longueur de l'antenne jusqu'à la Seta 1–4 (LANT4), la longueur de la tête (LHEAD), et la longueur du siphon jusqu'à la Seta 1-S (LSIPHSETIS) montrent une assez bonne variabilité qui pourrait être utilisée en combinaison avec les caractères des nymphes et des adultes pour séparer les populations. Dans la nature, nous trouvons des populations de moustiques anthropophiles ou non anthropophiles, en particulier dans les tarots Colocasia, les bananiers (Musa sp.) les Dracaenia et les ananas Ananas sp. L'analyse multivariée que nous avons réalisée ne permet pas de séparer les populations en fonction de leur comportement de piqûres ou de leur habitat de reproduction.

Keywords

mosquitoesAedes simpsoni complexlarvaemorphometricsUgandamoustiquescomplexe Aedes simpsonilarveétude morphométriqueOuganda
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 23 , Issue 4 , December 2003 , pp. 331 - 340
Copyright
Copyright © ICIPE 2003

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References

REFERENCES

Coluzzi, M. (1964) Morphological divergences in the Anopheles gambiae complex. Estratto dalla Rivista di Malariologia. XLIII. nn. 4–6, 197–232.Google Scholar
Gibbins, E. G. (1942) On the habits and breeding habitat of Aedes (Stegomyia) simpsoni Theobald in Uganda. Ann. Trop. Med. Parasitol. 36, 151–160.CrossRefGoogle Scholar
Gillett, J. D. (1951) The habits of the mosquito Aedes (Stegomyia) simpsoni Theobald in relation to the epidemiology of yellow fever in Uganda. Ann. Trop. Med. Parasitol. 45, 110–121.CrossRefGoogle Scholar
Gillett, J. D. (1955) Further studies on the biting behaviour of Aedes (Stegomyia) simpsoni Theobald in Uganda. Ann. Trop. Med. Parasitol. 49, 154–157.CrossRefGoogle ScholarPubMed
Haddow, A. J. (1945) On the mosquitoes of Bwamba County, Uganda. II. Biting activity with special reference to the influence of microclimate. Bull. Entomol. Res. 36, 33–73.CrossRefGoogle Scholar
Haddow, A. J. (1968) The natural history of yellow fever in Africa. Proc. R. Soc. Edinb. Sect. B. (Biol.) 70, 191–227.Google Scholar
Huang, Y. M. (1979) Aedes (Stegomyia) simpsoni complex in the Ethiopian region with lectotype designation for simpsoni (Theobald) (Diptera: Culicidae). Mosquito Systematics 11, 221–254.Google Scholar
Inayatullah, C., Webster, J. A. and Fargo, W. (1987) Morphological variation in the alates of greenbugs (Homoptera: Aphididae) biotypes. Ann. Entomol. Soc. Am. 80, 306–311.CrossRefGoogle Scholar
James, M. T. and Harwood, R. F. (1969) Herons' Medical Entomology. The Macmillan Co. Toronto, Canada. 484 pp.Google Scholar
Kambhampati, S. and Mackauer, M. (1989) Multivariate assessment of inter and intraspecific variation in performance criteria of several pea aphid parasites (Hymenoptera: Aphididae). Ann. Entomol. Soc. Am. 82, 314–324.CrossRefGoogle Scholar
Lutwama, J. J. (1991) Studies on the ecology and biosystematics of Aedes (Stegomyia) simpsoni Theobald (Diptera: Culicidae). PhD Thesis, Makerere University, Kampala, Uganda. 240 pp.Google Scholar
Lutwama, J. J. and Mukwaya, L. G. (1994) Variation in morphological characters of adults of Aedes (Stegomyia) simpsoni Complex (Diptera: Culicidae) from Uganda, Kenya and South Africa. Mosquito Systematics 26, 145–157.Google Scholar
Mahaffy, A. F., Smithburn, K. C., Jacobs, H. R. and Gillett, J. D. (1942) Yellow fever in western Uganda. Trans. Roy. Soc. Trop. Med. Hyg. 15, 57–82.Google Scholar
McCrae, A. W. R. and Mawejje, C. (1969) Man-biting Aedes (Stegomyia) spp. in the Nyamugasani Valley, Southern Ruwenzori. East African Virus Research Institute Report, 1968. No. 18, p. 93. Nairobi, East African Community Printer.Google Scholar
Miyingo, A. K. (1996) Morphological divergences in Aedes (Stegomyia) simpsoni complex (Diptera: Culicidae) in Uganda. PhD Thesis, Makerere University, Kampala, Uganda. 261 pp.Google Scholar
Mukwaya, L. G., Kayondo, J. K., Crabtree, M. B., Savage, H. M., Biggerstaff, B. J. and Miller, B. R. (2000) Genetic differentiation in the yellow fever virus vector, Aedes simpsoni complex, in Africa: Sequence variation in the ribosomal DNA internal transcribed spacers of anthropophilic and non-anthropophilic populations. Insect Molecular Biology 9, 85–91.CrossRefGoogle ScholarPubMed
Sokal, R. R. (1965) Statistical methods in systematics. Biol. Rev. 40, 337–391.CrossRefGoogle ScholarPubMed