毛颚小卷蛾幼虫空间分布型的研究

Spatial distribution of Lasiognatha cellifera Meyrick larva in Avicennia marina

毛颚小卷蛾幼虫是红树林的灾害性害虫之一,主要危害桐花树(Aegiceras corniculata)。主要应用扩散系数(C)、平均拥挤度(m*)等6种指标研究该虫的空间分布情况。结果表明:毛颚小卷蛾幼虫呈现聚集分布,分布的基本成分是个体群,聚集强度随种群密度的升高而相应增大;钦州康熙岭滩涂外滩植株有虫株率较低(10%以下),中滩25%左右,内滩最高(100%),而北海丹兜和防城港北仑河附近的红树林滩涂,从外滩到内滩有虫株率呈现逐渐降低的趋势;幼虫在10月上旬危害最为严重。

Lasiognatha cellifera Meyrick is one of main pests damaging mangrove in Aegiceras corniculata.A aggregation indices such as diffusion coefficient（C）,mean crowding（m＊） were used to analyze the spatial distribution of L.cellifera Meyrick.The results showed that L.cellifera Meyrick was aggregately distributed in the mangrove,and the basic distribution component was individual population.Larvae population belonged to＂intensity dependent＂type.The population density was lower in the outside of bench in Qinzhou（below 10%）,and 25% in the middle beach,and in the inside of bench it was the highest（100%）.But the spatial pattern was the opposite in Beihai Dandou and Fangchenggang Beilunhe.The peak of the larvae occurred around early October.