关键词: 媒介蚊虫, 密度, 种群构成

Abstract:

Objective　To investigate the density of mosquitoes and their population composition in the ares of Shanxi province where Japanese encephalitis（JE） was highly prevalent. Methods　Mosquitoes were collected by light trap in pig pens, lakesides and other enviranments. Results　It was found that the mosquito density at Wuxing lakeside in Yongji was 2000.0 each trap night, 1352.0 in Chengbei district of Yongji city, more than 500 in Dingxiang county and in the Sushui riverside in Yongji and 100-500 in Linyi county(in Sep. 2006 and in Aug. 2007), Wutai county, Taiyuan city, Changzhi city, the Shengtian lakeside in Ruicheng and Yangquan city, with a density of less than 100 in Ruicheng, Linyi county (in Aug. 2006) and the Sushui riverside in Linyi. Culex tritaeniorhynchus accounted for 77.7 percent of all the mosquitoes collected from pens for livestock in Linyi (in Aug. 2007), however Ruicheng, Linyi county ( in Sep. 2006), Yongji city see a lower percentage in terms of the species. In terms of the density of Cx. pipiens pallens in the sites where the samples were collected, the suburbs were ranked at the top of the list, accounting for 100 percent, followed by Wutai county and Dingxiang county. There were fewer species of mosquetoes in other sites, with Aedes vexans and Ae. dorsalis as the major species. As far as the samples collected from lakesides and riversides were concerned, Cx. tritaeniorhynchus was most heavily populated in Shengtian lakeside in Ruicheng, accouting for 94.4 percent, with Cx. pipiens pallens having a highest in Wuxing lakeside and Sushui riverside in Yongji, being over 99.0%. Conclusion　In view of the high mosquito density,  Mosquitoe control in pens for livestock and other water-rich areas should be strengthened. Anti?mosquito publicity and promotion of mosquito control infrastructure are to be reinforced in Shengtian Lake scenic spot.

Key words: Mosquito vector, Density, Population composition