Abstract
The abundance of Anopheline mosquito species is the most common entomological measurement to determine the relationship between vectors and malaria incidence. We conducted an entomological survey to determine mosquito species diversity and abundance in relation to rainfall in Omi reservoir irrigation area, Nigeria. We collected adult mosquitoes from 10 randomly selected residential houses using Pyrethrum spray sheet and Human Landing Catch methods. We grouped the samples into irrigated (intervention) and non-irrigated (control) communities. During the 12-month sampling period, we collected a total of 4 285 mosquitoes belonging to 10 species in one family. The three most common species during this study were Anopheles gambiae, Anopheles funestus and Culex quinquefasciatus. Irrigated community has higher numbers of mosquitoes (69,4%) compared to those collected in non-irrigated community (32,0%). Comparing the two collection methods used, Pyrethrum spray sheet has a greater number 2 225(75,4%) of mosquitoes than those with Human Landing Catch method 724(24,6%). During dry season, we collected fewer mosquitoes. The lowest number was collected in February (114) and the highest occurring during the wet season in July (445).
Highlights
RESUMEN: Distribución y abundancia estacional de los mosquitos anofelinos y su asociación con la lluvia en las áreas de riego y sin irrigación en Nigeria
Recent studies have shown that the abundance of Anopheline mosquito species is the most common entomological measurement used to determine the relationship between vectors and malaria incidence in any locality (Muturi et al, 2006; Zimmerman, Galardo, Lounibos, Arruda & Wirtz, 2006)
Seasonal abundance of mosquitoes and their association with rainfall: A total of 4 285 adult mosquitoes comprising 3 073 Anopheles spp. and 1 177 culicines were collected over the 12 months study period (Nov 2013 to Oct 2014)
Summary
Recent studies have shown that the abundance of Anopheline mosquito species is the most common entomological measurement used to determine the relationship between vectors and malaria incidence in any locality (Muturi et al, 2006; Zimmerman, Galardo, Lounibos, Arruda & Wirtz, 2006). Changes that occur in the environment especially in climate have a great bearing on breeding habitats of different mosquito species that influences the population density of adult mosquitoes (Bashar & Tuno, 2014). Climatic factors such as rainfall affect adult mosquito abundance by drastically altering the quality and quantity of breeding habitats. This study was conducted to investigate the species composition and seasonal population dynamics and their possible association with rainfall and disease transmission in the irrigated communities, prior to the implementation of a National malaria vector control
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