无视异绒螨—棉蚜的生态位及其空间格局的研究

STUDY ON THE NICHE AND SPATIAL PATTERN OF ALLOTHROMBIUM IGNOTUM—APHIS GOSSYPII

无视异绒螨(Allothrombium ignotum Willman)是棉蚜的一种寄生性天敌。研究结果表明:该种天敌发生时间早,数量大,与棉蚜的种群波动呈明显的同步关系;加之它与棉蚜的时间一空间生态位重叠度高,二者的空间格局一致,所以对抑制早期棉蚜基数的增长具有重要的作用。

In this paper, the research results showed the active stage of Allothrombium ignotum is earlier and its population density is higher than that of other enenies of cotton aphid. Synchronous relationship presents between the population dynamics of A. ignotum and cotton aphid. The space-time niche is higher overlaped and the spatial pattern is consistent between Aeiothrombium ignotum and cotton aphid. A. ignotum has a strong suppression to the population growth of cotton aphid in the early stage of cotton seedling.