关键词: 蚊虫, 种群密度, 年际变化

Abstract: 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.