不同猎物及猎物密度对大灰食蚜蝇捕食效应及生长发育的影响

Effects of Various Pren and Prey Densities on the Predation Growth and Development of Syrpgus corollae F

不同猎物种类及同种猎物的不同密度对大灰食蚜蝇的捕食效应及其生长发育的影响的研究表明:大灰食蚜蝇幼虫随年龄的增大,其捕食量增大。捕食反应属Holling Ⅱ型反应,寻找效率(a)在发育到第五六天时最大,而处理时间(Th)则随年龄的增大而减小;猎物密度的大小对大灰食蚜蝇的发育速率、体重、存活率以及羽化率均有影响;用甘蓝蚜饲养大灰食蚜蝇幼虫,不能正常完成其个体发育;其它一种蚜虫对大灰食蚜蝇的生长发育和体重也有一定影响。

Syrphus corollae F. is one of major predaceous natural enemies of many aphids in the fields of wheat, rape and broad bean. The effects of various aphids and aphids densities on the predation, grawth and development of S. corollae were presented. The results showes: 1. The number of prey eaten by the larva of S. corollae increases with its age increment. The number of prey eaten is the largest when it developed to the eighth and the ninth days; The functional response of larva of S. corollae is typical Holling Ⅱ response. The rate of successful search (α) is the larest when it developed to the fifth and sixth days. The handling time (Th) decreases with its age increment. 2 The rate of growth and development, living rate, emerging rate and its weight are influenced by feeding prey (Acyrthosiphon dirhodum) densities. S. corollae can complete its individual development when the larva has eaten 58.82 A. dirhodum in the larva stage. 3. The larvae feeded by Brevicoryne brassicae cannot complete its individual development. The larvae feeded by four aphids (Rhopalosiphum padi, Macrosiphum avenae, Acyrthosiphon dirhodum, Acyrthosiphon pisum) have some difference on the wight, growth and development.