浙江六横岛潮间带底栖生物组成特点

本文报导了六横岛潮间带底栖生物的种类、组成、数量分布及其与环境因子的关系。经鉴定，六横岛泥沙滩潮间带共有底栖生物２７种，其中软体动物占４０．８％，多毛类和甲壳类各占２９．６％。泥沙滩底栖生物密度（除沙滩节肢动物外）均以高潮区→低潮区逐渐降低，不同潮区生物量均无明显的变化规律，但不同生境潮间带决定着不同底栖生物种类组成，泥滩以多毛类占优势，沙滩则以软体动物占优势．

THE COMPOSITION CHARACTERISTICS OF BENTHONS IN TIDE AREAS OF LIUHENG ISLAND IN ZHEJING

The paper reports the variety of benthons,their formation,their distribution on number and their relationship with environmental factors in tide areas of Liuheng Island. By bioassay,there are 27 species of benthons at silt beacher of tide areas in Liuheng Island, among which molluscs amount to 40. 8%, polychaetes and crustaceans 29.6% respectively. The density of benthons at the silt beaches(except arthropods there) comes down gradually from high tide areas to low tide areas. There is no distinct law of change in the amount of organisms at different tide areas. However, the formation of different types of benthons is determined by different tide areas of eco-environment, with polychaetes in dominance at mud beaches, and mollucs at sand beaches.