星豹蛛对棉花害虫的捕食效应研究

Control effect of Pardosa astrigera to cotton pests

研究了星豹蛛对棉花害虫的捕食效应．观察结果表明：星豹蛛对棉蚜、叶螨、棉铃虫、棉盲蝽的种群数量具有明显的控制作用．田间种群数量消长与棉花害虫密度表现为动态正相关（ｒ＝０．６１２４～０．８９２８）．在试验条件下，其功能反应表现为随猎物密度的增加捕食量增大，随自身密度的增加捕食量减少．用Ｈｏｌｉｎｇ－Ⅱ型反应模型Ｎａ＝ａ′ＴＮｔ／（１＋ａ′ＴｎＮｔ）能较好地拟合．星豹蛛对四种猎物的日最大捕食量依次为７１．４，１５８．７，１７．８，２５．０头．在蚜螨猎物共存时，星豹蛛的选食作用较小，选择系数Ｅ＝０．

The spider, P.astrigera, is an important predator of Aphis gassypii, Thtranychus truncatus, Heliothis armigera, Adelophcoris fasticaticollis.  The population quantities of P.astrigera are positively correlated with pest densities in cotton field(r=0.612 4～0.892 8). The functional response is increased with density of preys and decreased with their own densities in the laboratory. The function is stimulated with the mathematic models of Holling Ⅱ as: Na=a′TNt/(1+a′TnNt). The largest predatony populations of P.astrigera to the four preys are 71.4, 158.7, 17.8, 25.0 respectively. The predation of P.astrigera in the aphidand mite prey system are described as:E=0.989 6.