Cannibalism and predation on eggs by larval lady beetles Harmonia axyridis (Coleoptera: Coccinellidae)
Cannibalism is a common occurrence in Harmonia axyridis.In order to know the impact of cannibalism and predation on the development and survival in H.axyridis,its cannibalism on conspecific eggs and interspecific predation on Coccinella septempunctata eggs were studied under non-choice condition.The result shows that H.axyridis all can develop and survival with each of the foods.The developmental duration was shortened and there has significant difference (P ＜ 0.05 or P ＜ 0.01) between food of aphids and conspecific or heterospecific eggs for the first instar larvae,pupa and egg-adult period.Survival ratio of first instar larvae was significantly higher when offered heterospecific eggs or conspecific eggs (P ＜ 0.05).Larvae fed aphids throughout the development were heavier than those fed eggs.Laboratory data also predict that the size fed aphids rather bigger than fed eggs and there has significant difference with the 4th instars.These indicated that cannibalism and predation are essential for the existence of the species,but not the better means for its growth and survival.
NETL
NSTL
万方数据
维普
