摘要
本文采用Iwao(1968—1977)的m~*-m回归方法测定了矢尖蚧及其主要天敌——二双斑唇瓢虫、日本方头甲和矢尖蚧蚜小蜂的空间格局,结果表明矢尖蚧及其主要天敌均为聚集分布;空间结构均为疏松的个体群存在;个体群的分布是聚集的,个体群内的分布是随机的。比较了矢尖蚧及其主要天敌在柑桔树冠不同部位的聚集程度、矢尖蚧、二双斑唇瓢虫和矢尖蚧蚜小蜂均以上部—中部外层的聚集程度较大,日本方头甲以下部—中部内层的聚集程度较大;矢尖蚧、二双斑唇瓢虫和日本方头甲均以南方的聚集程度最大,以东方的聚集程度最小,矢尖蚧蚜小蜂以西方聚集程度最大,以北方聚集程度最小。并且分析了矢尖蚧及其主要天敌在柑桔树内的聚集原因。
The spatial patterns for arrowhead scale(Prontaspis yanonensis Kuwana) and its natural enemies are analyzed by means of Iwao's method of regression of mean crowding(m*) on mean density(m) using data from Guiyang, Guizhou province. The results indicated that arrowhead scale(Prontaspis yanonensis Kuwana)and its natural enemies, Chilocorus bijugus Mulsant, Cybocephalus nipponicus Endrody-Younga, Aphytis yanonensis De Bach et Rose, all distribute in aggregation within the crown of citrus tree. The populations occur in loose colonies, the patterns of which are aggregative, and the individuals within colonies are randomly disposed for all the four species.The aggregative intensities of P. yanonensis, Ch, bijugus, A. yanonensis are larger in upper middle-outer parts than other parts in the crown; C, nipponicus is larger in the lower middle inner. The aggregative intensities of P, yanonensis, Ch. bijugus, C. nipponicus are the largest in the south and the sma lest in the easts for A yanonensis it is the largest in the west, and the smallest in the north.The reason for aggregation is analyzed with Blackith's aggregating mean (A). The result shows their aggregation is interfered by some environmental factors as the mean densities of P. yanonensis, A. yanonensis are less than about 3.1 and 4.5, respectively, and less than 3.4 for Ch. bijugus, and C. nipponicus. When the densities go beyond these criterions, the aggreation of P .yanonensis may be influenced by aggregating behavior of early first instar nymphs and some enviromental factors,and for the natural enemies not only by aggregating behavior of their own's but also by that of arrowhead scale.
出处
《生态学报》
CAS
CSCD
北大核心
1991年第2期147-152,共6页
Acta Ecologica Sinica
关键词
矢尖蚧
天敌
空间格局
Prontaspis yanonensis(Kuwana), Chilocorus bijugus Mulsant, Cybocephalus nipponicus Endrody-Younga,Aphytis yanonensis DeBach et Roson, spatial pattern.
