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Communication incl. Poster: BibTeX citation key:  PouemeNamegni
Poueme Namegni, R. S., Faye, A., Ndione, J.-A., Kebe, C. M. F., Ba, Y., Diallo, D., Dia, I., Sambou, B. & Diallo, M. 2009. Impact of environmental parameters on the dynamics of aquatic and adult stages of Rift Valley Fever and West Nile vectors in Senegal. Work presented at Third International AMMA Conference, June 20—July 24, at Ouagadougou, Burkina Faso.
Added by: roussot 2009-10-19 16:46:11
Categories: Environment and Climate Monitoring, Society-Environment-Climate interactions
Keywords: Health
Creators: Ba, Dia, Diallo, Diallo, Faye, Kebe, Ndione, Poueme Namegni, Sambou
Publisher: African Monsoon Multidisciplinary Analyses (Ouagadougou, Burkina Faso)
Collection: Third International AMMA Conference

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An entomological study was carried out in 2008 in Barkedji (Senegal, West Africa), a pastoral zone known as endemic focus of Rift valley fever virus (RVFV) and West Nile virus (WNV). The main objectives were i) the characterization of the larval sites at 3 pools (Niakha, Kangaledji, Ngao) ii) the investigation of the impact of certain climatic and environmental parameters (temperature, rainfall, relative Humidity, pH, conductivity/salinity and total salts dissolved) on the ecology and the dynamics of vectors. Adult mosquito collections were conducted from July to November using sheep and chicken baited traps whereas larvae were sampled using a half-barrels placed at specific points around of pools.
Among 5620 mosquitoes collected in the sheep baited traps. Culex poicilipes, Aedes vexans, Aedes ochraceus, Mansonia uniformis (the vectors previously found associated with RVFV and WNV in Senegal) represented 78.32%: Cx. poicilipes being predominant (51.25%). In the chicken baited traps, 1079 specimens were collected. Ae. vexans, Ae. ochraceus, Cx. poicilipes, Culex neavei and Ma. uniformis represented 91.02 % of the collection with pre-eminence of Cx. poicilipes representing 75.35 %.
Cx. neavei, one of WN vectors, represented 47.63% among 2198 mosquitoes collected from larval collections. The seasonal evolution of the variables associated with water quality allowed the comparison between pools. In Niakha and Kangaledji, a positive correlation was observed between the rainfall, the relative humidity and the dynamics of the adult stages of Ae. vexans. A negative correlation was however observed between relative humidity and the dynamics of Cx. poicilipes and Cx. neavei. For larval collections, a positive correlation was found between Cx. poicilipes, water conductivity and total dissolved solutes.
Such observations of the dynamics of vectors, allow understanding the impact of climatic and environmental factors on these vectors, can significantly improve our ability to analyse risks and to predict the occurrence of epidemics.
Added by: roussot