切割潜蝇茧蜂空间分布型及其应用

Study of the Spatial Distribution Pattern and Its Application of Adults of Psyttalia incisi (Silvestri)

应用频次分布卡方检验法、Iw ao法、T ay lor幂法则以及其它聚集指标等方法,分析研究了切割潜蝇茧蜂(成蜂)种群的空间分布型.结果表明:切割潜蝇茧蜂在果园受害果中呈负二项分布,实测X2=8.137<X20.05=14.07;根据各种聚集度指标和Iw ao线性回归分析,测定结果为切割潜蝇茧蜂在林间呈聚集分布,但个体之间相互排斥,成蜂的这种分布由寄主害虫桔小实蝇的聚集分布引起,且该寄生蜂对密度不具有依赖性.同时计算了林间调查的最适理论抽样数,列出了序贯抽样分析表.

The methods of comparative frequency distribution were employed to measure the spatial distribution pattern of parasitoids of Psyttalia incisi （Silvestri） in Fujian Province. The results show that the parasitoids obey the Mosaic distribution. The spatial distribution pattern was measured by the indexes of aggregation and Iwao＇s regression analysis. The results show that the spatial distribution pattern was also aggregating with individual exclusive, but the aggregation did not rely on the increase of population density of P. incisi. This aggregation is possibly related to the aggregation of oriental fruit flies in infested fruits. Meanwhile, the optimal theoretical sampling number and sequential sampling number were also calculated and analyzed.