Phenotypic Characterization of the Resistance Status of Anopheles gambiae s.l. from Oyem, North Gabon to Four Classes of Insecticides

Distribution and Characterization of Culicids (Diptera: Culicidae) in Two Urban Communes of Estuaire Province of Gabon

“…Akanda be explained by the capacity of its larvae to adapt and develop in diverse microhabitats. The Culcidian fauna of this current study was similar to that reported by Kutomy et al 14 in Sevidzem et al 7 in the Akanda area, where they mentioned the presence of all three genera. Furthermore, of the 250 potential microhabitats surveyed and with a high larval density recorded, the number of adults that emerged under standard laboratory-rearing conditions was very low and this could probably be due to the following reasons: (i) The existence of intraspecies and interspecies competition 17 and with the possibility of cannibalism 18 and (ii) The switch from natural microhabitat to laboratory could have led to their stress and more so when the physicochemical parameters of the laboratory rearing container are not all met (temperature, light, humidity) 19 .…”

“…This finding was similar to the reports of Mourou et al 6 and Sevidzem et al 7 in Akanda and Libreville where containers were the most frequent and positive mosquito larval breeding ground. However, the report of Kutomy et al 14 reported puddles as the most positive larval microhabitat for Anopheles in the Oyem area. This observation of Kutomy et al 14 after the collection of larvae of Anopheles and raising them to identify adults was the reason why they mostly prospected puddles which have already been reported to be favorable breeding grounds for the larvae of this genus 15 .…”

“…However, the report of Kutomy et al 14 reported puddles as the most positive larval microhabitat for Anopheles in the Oyem area. This observation of Kutomy et al 14 after the collection of larvae of Anopheles and raising them to identify adults was the reason why they mostly prospected puddles which have already been reported to be favorable breeding grounds for the larvae of this genus 15 . The majority of the larval breeding microhabitats were typical of that of Culicinae as already described for Culex pipiens with the following characteristics such as minimally polluted water (gutters, containers and puddles) by Shaman et al 16 .…”