Effects of co-habitation between Anopheles gambiae s.s. and Culex quinquefasciatus aquatic stages on life history traits

Kweka Eliningaya J., Zhou Guofa, Bagny-Beilhe Leila, Dixit Amruta, Afrane Yaw, Gilbreath Thomas M., Munga Stephen, Nyindo Mramba, Githeko Andrew, Yan Guiyun. 2012. Effects of co-habitation between Anopheles gambiae s.s. and Culex quinquefasciatus aquatic stages on life history traits. Parasites and Vectors, 5 (33), 9 p.

Quartile : Q1, Sujet : PARASITOLOGY

Résumé : Background: The effective measures for the control of malaria and filariasis vectors can be achieved by targeting immature stages of anopheline and culicine mosquitoes in productive habitat. To design this strategy, the mechanisms (like biotic interactions with conspecifc and heterospecific larvae) regulating mosquito aquatic stages survivorship, development time and the size of emerging adults should be understood. This study explored the effect of co-habitation between An. gambiae s.s. and Cx. quinquefasciatus on different life history traits of both species under different densities and constant food supply in the habitats of the same size under semi-natural conditions. Methods: Experiments were set up with three combinations; Cx. quinquefasciatus alone (single species treatment), An. gambiae s.s. alone (single species treatment); and An. gambiae s.s. with Cx. quiquefasciatus (co-habitation treatment) in different densities in semi field situation. Results: The effect of co-habitation of An. gambiae s.s. and Cx. quinquefasciatus was found to principally affect three parameters. The wing-lengths (a proxy measure of body size) of An. gambiae s.s. in co-habitation treatments were significantly shorter in both females and males than in An. gambiae s.s single species treatments. In Cx. quinquefasciatus, no significant differences in wing-length were observed between the single species and cohabitation treatments. Daily survival rates were not significantly different between co-habitation and single species treatments for both An. gambiae s.s. and Cx. quinquefasciatus. Developmental time was found to be significantly different with single species treatments developing better than co-habitation treatments. Sex ratio was found to be significantly different from the proportion of 0.5 among single and co-habitation treatments species at different densities. Single species treatments had more males than females emerging while in co-habitation treatments more females emerged than males. In this study, there was no significant competitive survival advantage in cohabitation. Conclusion: These results suggest that co-habitation of An. gambiae s.s. and Cx. quinquefasciatus in semi-natural conditions affect mostly An. gambiae s.s. body size. Hence, more has to be understood on the effects of cohabitation of An. gambiae s.s. and Cx. quinquefasciatus in a natural ecology and its possible consequences in malaria and filariasis epidemiology.

Classification Agris : L73 - Maladies des animaux
L72 - Organismes nuisibles des animaux

Champ stratégique Cirad : Axe 4 (2005-2013) - Santé animale et maladies émergentes

Auteurs et affiliations

• Kweka Eliningaya J., Kenya Medical Research Institute (KEN)
• Zhou Guofa, UCR (USA)
• Bagny-Beilhe Leila, CIRAD-BIOS-UPR Bioagresseurs (FRA)
• Dixit Amruta, UCR (USA)
• Afrane Yaw, Kenya Medical Research Institute (KEN)
• Gilbreath Thomas M., UCR (USA)
• Munga Stephen, Kenya Medical Research Institute (KEN)
• Nyindo Mramba, Tumaini University (TZA)
• Githeko Andrew, Kenya Medical Research Institute (KEN)
• Yan Guiyun, UCR (USA)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/567709/)

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