Analysis of a 7-year abundance dataset of Culex pipiens s. L.
M C Proença
This is a preliminary analysis of a Culex pipiens s.l. data set captured during seven years over Portugal mainland in a long-term surveillance program that include also other mosquitoes; we focus on Culex pipiens females’ abundance because is the most frequent species in Portugal and due to its medical importance, acting as a vector for more than 20 viruses. We quantify the methods used, the type of bait in the traps and the places of capture for 37.094 females Culex pipiens at national level and compare regional health administrations with further detail using the captures above 25 individuals. A first overall analysis show that the options with better efficacity were CDC traps without bait, although the CO2 bait option follows closely. A second look using a subset containing 84% of all females in the dataset shows more detail on the performance of the two main bait options - dry ice and without bait, both used in all regions. We were able to conclude that the dry ice option led to larger catches in all but the southernmost region, with milder weather, where a higher density of mosquitoes seems to justify the irrelevance of the bait. These results will help to shape the surveillance program in next years, eventually reducing costs and enabling better planning.