集团内捕食作用是一种更为复杂的种间关系，广泛存在于各类生态系统中。为明确棉蚜捕食性天敌之间集团内捕食水平与个体发育阶段的关系，观察了大草蛉，七星瓢虫与多异瓢虫不同虫态之间40个处理组合的集团内捕食水平。在温室盆栽棉花（无蚜虫）上接种等量的试虫，观察24 h后的存活数量。结果表明，当参与双方的虫态不同时，出现不对称捕食，高一虫态处于优势；当参与双方的幼虫龄期不同时，高龄幼虫的存活数量显著大于低龄幼虫，呈现单向捕食；成虫对卵、1龄和4龄幼虫的捕食程度随虫龄增大而呈抛物线增长，存在显著的二次函数关系。本研究结果说明，在没有集团外猎物（蚜虫）存在的情况下，当广谱捕食性天敌大草蛉、七星瓢虫与多异瓢虫之间的集团内捕食水平在参与者的虫态或虫龄不同时，集团内捕食水平与双方发育阶段有关；当参与者虫态或虫龄相同时，取决于物种生物学特性。%Intra group predation is a more complex inter species relationship,which is widely existed in all kinds of ecological systems. The relationship between the group of predators in clear aphid predation levels and indi-vidual developmental stages,Chrysopa septempunctata,Coccinella septempunctata and Hippodamia variegata to ob-serve the level of predation in the group of 40 treatment groups with different insect States. In greenhouse pot cotton (no aphids)were inoculated with the same amount of test worms,the number of survival after 24 h. The results indi-cate that when the participating parties are in a different state of the insect,Asymmetric predation occurs,the higher one is in the dominant position:When the larval instar of both sides is different,Old larvae survival number was sig-nificantly greater than that of the young larvae,Unidirectional prey:The degree of predation on the eggs,the 1 and the 4 instar larvae increased with the increasing of the age,There is a significant relationship between the two func-tions. The results of this study show that,In the absence of a group of prey(aphids),When broad-spectrum predato-ry enemies Chrysopa septempunctata,Coccinella septempunctata and many different Ladybug between group preda-tion levels in different participants of insect morphology or instar,The level of predation in the group was related to the developmental stages of the two groups. when the same participants insects or insect age,depending on biological characteristics of species.
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