【摘要】 自残现象的发生在异色瓢虫Harmonia axyridis中很是常见,为明确自残行为对其存活和生长发育的影响,在非选择性条件下我们对异色瓢虫幼虫对非姊妹卵的种内自残和对七星瓢虫Coccinella septempunctata卵的种间捕食进行了研究。结果表明,异色瓢虫取食同种卵和异种卵均可完成生长发育,与取食蚜虫相比:1其从卵到成虫及蛹期的发育历期明显缩短(P<0.05),其中1龄幼虫发育历期缩短非常明显(P<0.01);2自然条件下高死亡率的1龄幼虫的存活率明显提高(P<0.05);32-4龄幼虫、蛹和成虫的体重变轻(P<0.05),且体长在4龄幼虫间也表现出显著差异(P<0.05)。这表明异色瓢虫种内自残和种间捕食对其在食物恶劣条件下延续种群至关重要,但对种群的繁衍却不是最理想的途径。更多还原

【Abstract】 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 4thinstars. These indicated that cannibalism and predation are essential for the existence of the species,but not the better means for its growth and survival.更多还原