南极附近水域微小型藻类的研究 Ⅴ．长城站周围不同生境淡水藻类的分布

STUDIES ON NANO AND MICROALGAE IN THE ADJACENT WATERS OF ANTARCTICA Ⅴ.DISTRIBUTION OF FRESHWATER ALGAE IN DIFFERENT HABITATS AROUND GREAT WALL STATION

本文报道了长城站周围西湖水、西湖泥沙、陆地雪（西湖雪、企鹅粪便和藓类沼泽地）等不同生境淡水藻类的种类组成、密度及分布、生态类群及相似性。分析结果表明，不同生境的种类组成和密度差异显著。陆地雪（４、５站）的藻类密度大于西湖中的水、雪、泥沙。在已鉴定３个门类５０种淡水藻类中，划分为两大生态类群：根据其生存环境，划分为水生藻类和雪生藻类；或根据生活方式的不同，划分为浮游藻类和底生（着生）藻类。

This paper reports the species composition,distribution,ecotypes and similarity of freshwater algae from five different habitats,i. e. in water,snow, mud sand of West Lake and red colored snow in penguin guano and snow in moss cushions around Great Wall Station. The difference is obvious in composition and abundance of algae among the habitats. Algae abundance revealed in the range of 11.04×10 3 ～ 2337.12×10 3 individuals or cells per dm 3 of the water and snow melted water or per gram of mud sand. According to habitats or the different mode of life, 50 taxa of 3 phyla in total are distinguished into two ecotypes:water algae and terrestrial (snow) algae; or freshwater planktonic algae and freshwater benthic (epiphytic) algae.