菱角小萤叶甲种群动态研究

Investigations on population dynamics of Galerucella birmanica Jacoby

对菱角小萤叶甲在菱塘的发生数量调查和分析表明,菱角小萤叶甲种群数量在一年中春末夏初和夏末秋初各有一个高峰期。温度是影响菱角小萤叶甲种群数量消长的关键因子;聚集度指标的分析表明,菱角小萤叶甲在菱塘呈聚集分布。聚块性指标与平均密度独立,适合用于分析菱角小萤叶甲分布型的时序变化;在控制条件下菱角小萤叶甲种群动态的研究表明,该虫具有较强的种群数量调控能力。

The population dynamics of Galerucella birmanica Jacoby in water chestnut fields was investigated and analyzed, The results indicated that there were two peaks of population number at pre-summer and pre-autumn. Temperature was the key factor affecting population dynamics of G. birmanica, The aggregated indices were also analyzed. The results indicated that the distribution was aggregated and the index of patchiness was suitable for analyzing the variety of spatial distribution patterns of Galerucella birmanica. The experiment of control conditions also indicated that temperature was the key factor affecting population dynamics of G. birmanica. This insect had a strong adjustive and control ability.