拟水狼蛛对白背飞虱的捕食功能反应

The Predacious Functional Response of Pirata Subpiraticus to Sogatella Furcifera

拟水狼蛛对白背飞虱的捕食量:无卵囊雌蛛>亚雄蛛>有卵囊雌蛛。其功能反应属HollingⅡ型。当猎物数量不变时,蜘蛛对自身密度的功能反应符合E=QP^(-m)模型;当猎物密度随蜘蛛密度成比例增加时,平均每头蜘蛛捕食的猎物数量差异不显著。同一空间内,当白背飞行虱多于褐飞虱时,蜘蛛对白背飞虱有明显的选择性;当白背飞虱少于或等于褐飞虱时,蜘蛛则喜食褐飞虱。

The predacious capacity of P. subpiraticus to white backed planthopper (S. furcifera) was as follows: female adult spiders without egg capsule>male subadult spiders> female adults with egg capsule. Its function-response pattern coincided with Holling II. When population of the prey remained stable, the function-response pattern of the spider to population density of itself fit for E = QP-Mmodcl; whereas, the average prey amount predated by a spider did not differ significantly when the prey's density proportionally increased to the spider's density. An obvious selectivity of P. subpiraticus on S. furcifera would occur, when white backed planthopper exceeded brown planthopper in number within a single space. However, the spider would be favourable for brown planthopper if withe backed planthopper was less than or equal to brown planthopper in number.