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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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