水生捕食线虫真菌季节性分布及多样性研究

从云南滇池附近的三块水稻田和三口鱼塘中分离到的捕食线虫真菌种类比较相似,但从鱼塘中分离到的捕食线虫真菌种类要比水稻田中的少,两个生境中的优势种也不同.水稻田中,春季和秋季的优势种为Arbrostrys conoides,夏季和冬季的优势种为A.oligospora,秋季的捕食线虫真菌种类最多,春季次之,夏季和冬季最少;鱼塘中,春季、夏季和冬季的优势种均为Dactylellina ellipsosporum,秋季的优势种为A.ver-micola.夏季的捕食线虫真菌种类最多,其他三个季节的捕食线虫真菌种类相差不大.从湖南湘江衡阳段的300份泥土样品中,共分离、鉴定出17种水生捕食线虫真菌,东洲岛和新大桥水域分离的水生捕食线虫真菌比李坳水域分离的种数少.

The Seasonal Fluctuation and Diversity of Aquatic Nematode-trapping Fungi

Species of nematode-trapping fungi isolated from three paddy fields and three fish ponds around Dianchi Lake in Yunnan province were compared.Those isolated from the fish ponds were fewer than those from the paddy fields and the dominant species in the two eco-environments were not the same.In the paddy fields Arbrostrys conoides was dominant in spring and fall and A.oligospora was dominant in summer and winter.Further in fall,species of nematode-trapping fungi were the most,then in spring,in summer and winter.However,in the fish ponds,Dactylellina ellipsosporum was dominant in spring,summer and winter and A.vermicola,in fall.In summer,species of nematode-trapping fungi were more than those in any of the rest seasons and the amount of species in the three seasons varied little.From the 300 samples collected in Hengyang part of Xiangjiang River in Hunan province,17 species of nematode-trapping fungi were isolated and identified.But the amount of the species varied from sample site to site.Those in waters of Dongzhou Island and new Xiangjiang Bridge were more than those in waters of Liao in Xiangjiang River.