Study on the predation selectivity and function of Adalia bipunctata L.on Aphis gossypii Glover.
In order to explore the predation preferences of Adalia bipunctata L.on Aphis gossypii Glover.and Poratrioza sinica Yang et Li,the effects of predation amounts,searching efficiency,in-traspecific interference and predator density on the predation activities of Adalia bipunctata L.larvae at different stages and adults are investigated under different densities of Aphis gossypii Glover.and Adalia bipunctata L.,as well as the same ratio of Adalia bipunctata L.to Aphis gossypii Glover.The results show that the functional responses of Adalia bipunctata L.larvae at different stages and adults to Aphis gossypii Glover.are consistent with the Holling-Ⅱ model.The effects of intraspecific inter-ference and population density of Adalia bipunctata L.on its predation of Aphis gossypii Glover.con-form to the Hassell model and Watt model respectively.The maximum theoretical daily predation amounts of the 1st,2nd,3rd and 4th instar Adalia bipunctata L.larvae and adults are 13.19,29.29,62.89,124.67 and 105.03 Aphis gossypii Glover.respectively.There exists intraspecific interference effects among individuals of Adalia bipunctata L.within a certain space.Besides,the 1st instar larva is the most affected with an interference constant of 1.173 4.The density of Adalia bipunctata L.will have a certain impact on its predatory activity.The 4th instar larva has the most intense competition for food with a competition parameter of 0.922 0.The research results can provide data reference for improving the artificial breeding technology of Adalia bipunctata L.and the utilization efficiency of its resources as well as the prevention and control effects.
Adalia bipunctata L.Aphis gossypii Glover.Poratrioza sinica Yang et Lipredation effectpredation preference
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