Distribution and seasonal abundance of Anopheline mosquitoes and their association with rainfall around irrigation and non irrigation areas, Kogi State, Nigeria

摘要

Weconducted an entomological survey to determine mosquito species diversity andabundance in relation to rainfall in Omi reservoir irrigation area, Nigeria.Adult mosquitoes were collected from 10 randomly selected residential housesusing pyrethrum spray sheet and Human Landing Catch methods. The communitiessampled were grouped into irrigated (intervention) and non-irrigated (control)communities. During the 12-month sampling period, a total of 4285 mosquitoesbelonging to 10 species in 1 family were collected. The three most commonspecies collected during this study were Anophelesgambiae, Anopheles funestus and Culex quinquefasciatus. Higher numbersof mosquitoes (69.4%) were collected in irrigated community as compared tothose collected in non-irrigated community (32.0%). Comparing the twocollection methods used, a greater number 2225(75.4%) of mosquitoes werecollected with Pyrethrum spray sheet than those with Human Landing Catch method724(24.6%).Relatively fewer numbers of mosquitoes were collected during the drythan wet season in all collection points. The lowest number was collected inFebruary (114). However, the number increased, the highest occurring during thewet season particularly in July (445)