日本方头甲捕食桑盾蚧功能反应研究

Studies on the functional reaction of Cybocephalus niponicus Endrby Yonga preying Pseudaulacaspis pentagona Targioni Tozzetti.

日本方头甲捕食桑盾蚧量与桑盾蚧成虫和其初孵若虫密度呈负加速曲线关系,属于HollingⅡ型的功能反应。日本方头甲成虫捕食桑盾蚧成虫功能反应式为:Na=1.2329N/(1+0.1015N);捕食桑盾蚧初孵若虫的功能反应式为:Na=1.0709N/(1+0.0042N),其最大捕食理论值分别为1215头和25667头。

The relationship between the preying amount of Cybocephalus niponicus Endrby Yonga to Pseudaulacaspis pentagena Targioni Tozzetti and the density of the adult plus young nymph incubated of P. pentagona could be described with a negative accelerative curve. It was fitted to the functional response of Holling type Ⅱ. The functional reaction equations on the adult and 1st instar of P. pentagona were Na= 1.232 9 N/ (1+0.101 5 N) andNa=1.070 9 N/ (1+0.004 2 N), and their daily maximal preying amount were 12.15 and 256.67, respectively.