山西省辛安泉泉域三种泉溪大型藻类植物附生藻类的研究

对三种泉溪大型藻类(脆弱刚毛藻,弧形串珠藻和普生轮藻)藻体上附生藻类的种类、分布及环境因子与寄主本身对其的影响进行了研究。2004年7月至2005年4月在山西省辛安泉泉域采集三种大型藻类植物(每个季节采集一次)。研究结果表明,三种大型藻类藻体上的附生藻类种类数不同,普生轮藻上的附生藻类有49种,脆弱刚毛藻上37种,弧形串珠藻上6种,其中硅藻门种类数最多。这说明寄主本身结构的复杂程度在一定意义上会影响附生藻类的种类数及多样性。就季节变化而言,三种大型藻类藻体上的附生藻类也表现出了明显的季节性,大致趋势为:春季>秋季>夏季>冬季,同时,灰关联分析结果也表明,环境因子在一定程度上对附生藻类也有影响,最关键的影响因子是流速、水深和电导。这说明影响大型藻类植物藻体上附生藻类的影响因素是多方面的,不仅有寄主本身,同时流速、水深和电导这三种环境因子也起到了很关键的作用。

OCCURRENCE OF EPIPHYTIC ALGAE ON THREE STREAM MACROALGAE IN XIN’AN SPRING,NORTH CHINA

Epiphytic algae on three stream macroalgae(Chara vulgaris,Cladophora fracta and Batrachospermum arcuatum) were collected from two sites in Xin’an Spring,North China,during July 2004 to April 2005(one sampling per season).The species composition,distribution and effect of environmental factors on the epiphytic algae were studied.Several environmental factors were monitored at the same time.The species number of epiphytic algae on the three stream macroalgae was different because the habitat structure had pervasive effects on community composition and diversity.The epiphytic algae on Chara vulgaris resulted in 49 species,37 species on Cladophora fracta and only 6 species on Batrachospermum arcuatum,respectively.The predominant species of epiphytic algae on the three stream macroalgae belongs to Bacillariophyta.In terms of the seasonality,there was an obvious seasonal trend in species number of epiphytic algae: spring > autumn > summer > winter.The results also indicate that there were some environmental factors influenced the epiphytic algae in different extents.The key factors were current velocity,maximum depth,and specific conductance.