关键词: 蝇类, 密度, 种群构成, 季节消长

Abstract: Objective To understand the density, population structure and seasonality of flies in Haikou city, for the purpose of providing scientific basis for prevention and control of flies and fly-borne diseases. Methods The density surveillance of flies was conducted once a month using cage trap method from 2011 to 2016. Each surveillance site covered 4 habitat types, including the farmer's market, the external environment of restaurants, the green belt and the residential area. Results There were totally 24 977 flies captured during 6 years, and the average density of flies was 16.63 flies per cage. It was showed that Chrysomya megacephala was the predominant fly species (with a percentage of 43.58%). The period with the highest fly density was from April to September every year. The average density of flies of the green belt was the highest (25.04 flies per cage), while that of the external environment of restaurants was the lowest (13.18 flies per cage), among different habitat types. Conclusion The density of flies declined significantly in Haikou city after 2013. However, the environmental management should still be strengthened in the future and the breeding places of flies should be removed timely. Meanwhile, targeted control methods should be taken during the peak time, in order to reduce the fly populations.

Key words: Flies, Density, Population structure, Seasonal fluctuation