宁波市蚊类种群1999～2002年的年际动态变化

Annual Dynamic Change of Mosquito Density during 1999-2002 in Ningbo City of Zhejiang Province

目的 通过调查不同年份蚊虫种群的密度 ,以了解宁波地区蚊虫种群的年际变化规律 ,从而为蚊虫种群的有效控制提供理论依据。方法 采取定点定时的方法 ,利用直流电动捕蚊器捕捉蚊虫 ,然后分种统计捕获的蚊虫数。结果 宁波地区的优势蚊种为中华按蚊、淡色库蚊和三带喙库蚊 ,其中中华按蚊占捕获蚊虫总数的 42 .0 1%。 1999～ 2 0 0 2年蚊类种群密度波动较大 ,其中波动幅度最大的是淡色库蚊。 3种优势蚊种的季节分布呈单峰型 ,总体上最高峰在 6～ 8月 ,其中中华按蚊的高峰期出现在 4～ 5月 ,淡色库蚊的高峰期出现在 7～ 8月 ,三带喙库蚊则出现在 9～ 10月。结论 根据蚊虫种群密度的年际变化和季节消长规律 ,宁波地区蚊虫种群的控制工作重点是在每年的 4～ 5月 ,消灭各类孳生地中的蚊幼 。

Objective In order to get the annual change law of mosquito population density in Ningbo city and to provide the theoretical basis for the effective control of mosquito, the density of mosquito population during 1999- 2002 was investigated in Ningbo City. Methods Using mosquito adult trapping device to catch mosquito adults in different locations of City at fixed time every month of 1999- 2002, then counting the number of different mosquito species. Results The dominant species of mosquitoes in Ningbo City are Anopheles hyrcanus sinensis Wiedemann, Culex pipiens pallens Coquillett, and Culex tritaeniorhynchus Giles, among which, the ratio of A.hyrcanus sinensis in all mosquito adults traped by device was 42.01% . The density of mosquito population had a larger fluctuation during the period of 1999- 2002, especially C.pipiens pallens had the largest fluctuation range. The curves of season distribution of three dominant mosquito species were one peak type, on the whole, the peak appeared between June and August. As for single species, the peak of population density appeared between April and May for A.hyrcanus sinensis , between July and August for C.pipiens pallens , and between September and October for C.tritaeniorhynchus . Conclusion According to the laws of annual and season dynamics of mosquito population, the best time for controlling mosquito population in Ningbo city is April and May to decrease the population density of mosquito through all kinds of measures.