Study on the Biological Diversity of Nematode-trapping Fungi in Erhai Lake

[Objective] The research aimed to investigate the biological diversity of nematode-trapping fungi in the sediment of Erhai Lake.[Method] 616 pieces of sediments were collected from Erhai Lake.The traditional identification method was used to isolate,purify and identify.[Result] 3 genera and 22 species of nematode-trapping fungi were isolated.Arthrobotrys oligospora,A.musiformis and Dactylella leptospora were the predominant species,and their detection rates were 28.05%,16.04% and 8.92% respectively.By analyzing the diversity of nematode-trapping fungi in four seasons,it was found that the biological diversity was richer in summer,spring and autumn,and the diversity indexes were 2.59,2.47 and 2.34 respectively.The diversity index in winter was 1.48 and was lower.In the separated nematode-trapping fungi,the species which formed the viscous net were predominant(41.00%).[Conclusion] The rich nematode-trapping fungi resource existed in Erhai Lake,and its biological diversity had the seasonal variation characteristic.The nematode-trapping fungi which formed the viscous net were the predominant species in Erhai Lake.