• 关键词：孔石莼  水溶性抽提液  生长抑制  赤潮异弯藻  中肋骨条藻  塔玛亚历山大藻

• 基金项目：国家重点基础研究发展规划项目(G1999012011);中国科学院海洋研究所海洋生态与环境科学重点实验室开放基金

• 南春容
• 1. 潍坊学院生物系,潍坊　261043; 2. 中国海洋大学教育部水产养殖重点实验室,青岛　266003

• 张海智
• 潍坊学院生物系,潍坊　261043

• 董双林
• 中国海洋大学教育部水产养殖重点实验室,青岛　266003

• 摘要：研究了孔石莼水溶性抽提液对3种赤潮藻(赤潮异弯藻、中肋骨条藻和塔玛亚历山大藻)生长的影响.在实验的前4d内,孔石莼水溶性抽提液(0.25～2.0g·L^-1)对各赤潮藻种的生长皆表现出明显的抑制效应,最大抑制效应表现在接种后的第2～3d.各藻种生长受抑制的量随孔石莼水溶性抽提液浓度的增加而增加,当孔石莼水溶性抽提液的浓度达2.0g·L^-1时,赤潮异弯藻和中肋骨条藻被完全致死,塔玛亚历山大藻的生长受到强烈抑制.实验后期(5d后),低浓度处理组(0.25～1.0g·L^-1)的藻种加速生长,表现为促进效应.经高温处理后的孔石莼水溶性抽提液对赤潮异弯藻和中肋骨条藻的抑制效应完全消失,对塔玛亚历山大藻的抑制效应明显减弱.

• Abstract：Aqueous extracts of Ulva pertusa were tested for allelopathic activity against three species of red tide microalgae, Heterosigma akashiwo, Skeletonema costatum, and Alexandrium tamarense. Within the first four days of the experiment, the growth of all the three species of microalgae were strongly inhibited at exposure concentrations(0.25～ 2.0g·L^-1). Maximum inhibition effect occurred at the 2～3d of the experiment. The growth inhibition increased with the concentration of the extracts. The growth of H. akashiwo, and S. costatum were completely inhibited and A. tamarense was strongly suppressed at 2.0g·L^-1 treatment. The growth of microalgae was stimulated at lower concentration treatments (0.25～1.0g·L^-1) during the second half period (5～8d) of the experiment. The inhibitory effects of the extracts to H. akashiwo and S. costatum could not be observed and that to A. tamarense was obviously reduced after autoclaved for 20 minutes at 120℃.

• Key words：Ulva pertusa  aqueous extracts  growth inhibition  Heterosigma akashiwo  Skeletonema costatum  Alexandrium tamarense

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