• 关键词：UV-B辐射  种群竞争  抑制作用  亚历山大藻  赤潮异弯藻

• 基金项目：国家自然科学基金(30270258);山东省优秀中青年科学家科研奖励基金(03BS120)

• 唐学玺
• 中国海洋大学海洋生态学研究室, 青岛 266003

• 蔡恒江
• 中国海洋大学海洋生态学研究室, 青岛 266003

• 张培玉
• 1. 中国海洋大学海洋生态学研究室, 青岛 266003; 2. 曲阜师范大学生命科学学院, 曲阜 273165

• 摘要：通过共培养的方法,研究了亚历山大藻和赤潮异弯藻种群竞争关系对UVB辐射增强的响应变化.结果表明,不同的接种密度对亚历山大藻和赤潮异弯藻种群竞争有明显的影响.当亚历山大藻(A)和赤潮异弯藻(H)的接种比例为A:H=1:4时,赤潮异弯藻在与亚历山大藻的竞争中占优势;当接种比例为A:H=1:1和A:H=4:1时,亚历山大藻在竞争中占优势.UVB辐射增强可改变亚历山大藻和赤潮异弯藻种群竞争的关系,使赤潮异弯藻的种群竞争能力降低,使亚历山大藻的种群竞争能力大大提高,从而导致亚历山大藻在处理Ⅱ(A:H=1:1)和处理Ⅲ(A:H=4:1)中的优势地位更加明显.

• Abstract：The responses of the interspecific competition between Alexandrium tamarense and Heterosigma akashiwo to UV-Bradiation enhancement was studied by co-culture method. The results demonstrated that the different inoculative proportions of Alexandrium tamarense and Heterosigma akashiwo had apparent effects on interspecific competition between them. When the inoculative proportion of Alexandrium tamarense and Heterosigma akashiwo was A:H=1:4, Heterosigma akashiwo would be in predominance in the competition. However, Alexandrium tamarense would be in predominance when A:H=1:1 and A:H=4:1. The UV-Bradiation treatment could change the competition between Alexandrium tamarense and Heterosigma akashiwo, and it could promote the competitive dominance of Alexandrium tamarense. Therefore, the competitive dominance of Alexandrium tamarense changed more remarkable under UV-Bradiation treatment when A:H=1:1 and A:H=4:1.

• Key words：UV-B radiation  Interspecific competition  Inhibitation  Alexandrium tamarense  Heterosigma akashiwo

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