莆田市秀屿港蝇类种群密度与季节消长

Report of flies on densities and Seasonal Growth-Decline at Xiuyu Seaport of Putian

〔目的〕了解莆田市秀屿港蝇类种类、种群密度与季节消长情况。〔方法〕选择码头、生活区为观察点,调查不同环境蝇类组成和种群密度,观察重要蝇种季节消长。每月观察2次,以笼诱法计算种群密度（只/日·笼）。〔结果〕2003-2004年在秀屿港共捕获各种蝇类9757只,录属5科25属31种,平均密度指数为106.05只/笼·日。家蝇是当地优势蝇种,占全部捕获蝇数的33.07%,其次是市蝇和丝光绿蝇,分别占全部捕获蝇数的19.37%和18.64%。当地蝇类于2-12月均可捕获,3月份种群密度明显上升,5月份为活动高峰期。重要蝇种家蝇于5-7月份为活动高峰,大头金蝇于7月份为活动高峰,而巨尾阿丽蝇则活动于春季于5月份为活动高峰。〔结论〕秀屿港蝇类种类丰富,种群密度较高,环境整治是控制蝇类种群密度的根本措施。

Objective To understand the background species, distributions of flies, and their grouth and decline with seasonal change. Method Species constitution and seasonal population fluctuation of flies were investigated, and surveied twice per month. The index of density were calculated in the number/cage/day by the baitting cage. Result Total 9757 and 31 species were caught at Xiuyu seaport in 2003-2004, belonging to 5 families and 25 genera. The annual average density was 106.05. Musca domestica was the dominanting species, accounting for 33.07% of all flies. The second were Musca sorbens and Lucillia sericata, accounting for 19.37% and 18.64% respectively. The activating of flies was found in February to December, the peaking was in May. The peaking of Musc.domestiea were found in May to July. It was in July for Chrysomya megacephala. But the actively of Aldrich grahami was found in the Spring, the peaking was March to May. Conclusion It is important to improve the enviromental sanitation at Xiuyu seaport.