关键词: 微环境, 蚊虫监测, 种群动态, 上海中心城区

Abstract: Objective To study the mosquito population dynamics in different microenvironments of the same region and to analyze the relevant factors contributing to the differences in mosquito population dynamics in downtown Shanghai. Methods Five mosquito?monitoring sites were set according to the geographical distribution in the park and grassy areas of downtown Shanghai (People’s Square and People’s Park) where mosquitoes were frequently encountered. Adult mosquitoes were continuously monitored by CO2 trapping method for more than 220 days to determine the differences in mosquito population dynamics at the five monitoring sites. Results The 224 days continuous adult mosquito monitoring showed that the number and density of adult mosquitoes at the 5th monitoring site were 9737 mosquitoes and 43.50 mosquitoes/day·machine, significantly higher than those at the other four monitoring sites (P＜0.01), and the adult mosquito density in the People’s Square was significantly higher than that in the People’s Park (29.80 vs. 11.13 mosquitoes/day·machine; t＝-5.552, P＜0.01); as to the adult mosquito population, the constituent ratio of Aedes albopictus in the People’s Square was significantly higher than that in the People’s Park (25.32% vs. 9.54%; χ2＝187.923, P＜0.01), and the constituent ratio of Culex tritaeniorhynchus in the People’s Park was significantly higher than that in the People’s Square (18.46% vs. 2.77%; χ2＝187.923, P＜0.01); Cx. tritaeniorhynchus was the dominant species in the 2nd monitoring site (constituent ratio 48.55%). Conclusion The mosquito density and population vary significantly in different microenvironments of the same region, which may be attributable to such factors as breeding environment and human disturbance. The surveillance and control of Cx. tritaeniorhynchus should be implemented in downtown Shanghai.

Key words: Microenvironment, Mosquito surveillance, Population dynamics, Downtown Shanghai