%0 Journal Article
%T THE SPATIAL PATTERNS OF ARROWHEAD SCALE AND ITS NATURAL ENEMIES<br>矢尖蚧及其主要天敌空间格局研究
%A Ren Shun-Xiang
%A <br>任顺祥
%J 生态学报
%D 1991
%I 
%X 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.
%K Prontaspis yanonensis(Kuwana)
%K Chilocorus bijugus Mulsant
%K Cybocephalus nipponicus Endrody-Younga
%K Aphytis yanonensis DeBach et Roson
%K spatial pattern<br>矢尖蚧
%K 天敌
%K 空间格局
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=90BA3D13E7F3BC869AC96FB3DA594E3FE34FBF7B8BC0E591&jid=FE163E5DB2274E5937319DE98913EC37&aid=7ED42A35A47F3BDC188951722DC55B5F&yid=116CB34717B0B183&vid=708DD6B15D2464E8&iid=0B39A22176CE99FB&sid=2922B27A3177030F&eid=04445C1D2BDA24EE&journal_id=1000-0933&journal_name=生态学报&referenced_num=1&reference_num=4