Abstract:

Objective To investigate the species composition and seasonality of adult mosquito populations in Baoshan district of Shanghai, China, and to provide reference data for the prevention and control of mosquitoes and mosquito-borne diseases. Methods Labor hour method was used to determine mosquito population density. Surveillance data collected at the national vector monitoring site in Baoshan district of Shanghai during 2009-2012 were analyzed. Results Totally 5041 mosquitoes of 5 species were trapped during the four-year study period. Culex pipiens pallens was the predominant species of mosquitos in urban and rural residential areas (94.6% and 98.8%, respectively), while C. pipiens pallens and C. tritaeniorhynchus accounted for large proportions of mosquitos in the barn (46.6% and 23.5%, respectively). Average mosquito population density was lowest in the urban residential area, medium in the rural residential area, and highest in the barn (1.81 vs. 6.70 vs. 30.08 counts per labor hour). There were similar annual trends in seasonal fluctuations of mosquito populations, with high density generally in June to September and low density in January to April as well as November to December. The average value of mosquito population density index progressively increased over the four-year period. Conclusion No significant changes occurred in the species composition and seasonal fluctuations of adult mosquito populations in Baoshan district of Shanghai during 2009-2012. C. pipiens pallens was the predominant species of mosquitoes in urban and rural residential areas, which, together with C. tritaeniorhynchus, dominated the mosquito populations in the barn. It is recommended to carry out mosquito control from May to October in Baoshan district of Shanghai.

Key words: Mosquito population density, Surveillance, Species composition, Seasonal fluctuation

摘要：

目的 了解上海市宝山区2009－2012年成蚊种群构成和季节消长情况,为蚊虫及蚊媒传染病的防治工作提供科学依据。方法 采用人工小时法调查成蚊密度。对2009－2012年宝山区的国家病媒监测点蚊虫密度监测资料进行分析。结果 2009－2012年共捕获成蚊5种5041只,淡色库蚊是居民区和农户的优势种,分别占居民区和农户捕获成蚊总数的94.6%和98.8%;淡色库蚊和三带喙库蚊分别占牲畜棚捕获成蚊总数的46.6%和23.5%。居民区的平均密度最低为1.81只/人工小时,农户为6.70只/人工小时,牲畜棚的平均密度最高为30.08只/人工小时。每年季节消长情况相似,密度高峰一般在6－9月,1－4月和11－12月成蚊密度很低,4年平均密度指数呈递增趋势。结论 4年来成蚊种群构成和季节消长无明显变化,淡色库蚊为居民区、农户的绝对优势种,而牲畜棚的优势蚊种为淡色库蚊和三带喙库蚊,全区5－10月可开展蚊虫防治工作。

关键词: 成蚊密度, 监测, 种群构成, 季节消长