东海原甲藻与塔玛亚历山大藻种群增长过程与种间竞争研究

Study on Population Growth Process and Interspecific Competition of Prorocentrum donghaiense and Alexandrium tamarense

针对我国东海2种重要赤潮肇事生物东海原甲藻(Prorocentrum donghaiense)和塔玛亚历山大藻(Alexan-drium tamarense)进行了种群增长过程和种间竞争的实验研究。结果表明,单种培养时,不同氮磷比对东海原甲藻和亚历山大藻种群增长过程没有明显的影响,但是会影响其最终的细胞密度;在混合培养时,营养盐组成比例不同对东海原甲藻和塔玛亚历山大藻的种间竞争过程有影响,但不会影响其最后竞争结果。竞争物种的细胞起始密度对种间竞争结果有明显的影响,P.donghaiense和A.tamarense的接种细胞密度比为2 000∶100和2 000∶200时,东海原甲藻占优势;当接种细胞密度比为4 000∶400时,塔玛亚历山大藻占优势。

The study on population growth process and interspecific competition of two red tide species Prorocentrurn donghaiense and Alexandriurn tarnarense in the East China Sea was made. It is shown from the study results that different N/P supply ratios had no significant effect on population growth process of the two species during unispecific cultures, but had effect on the final cell density; and different N/P ratios had effect on the interspecific competition process of the two species during bispecific cultures, but had no effect on the final competition results. The initial cell densities of competitional species had significant effect on the interspecific competition results during bispecific cultures, when the ratios of inoculated P. donghaiense cell density to A. tarnarense cell density were 2000 ： 100 and 2000 ： 200, P. donghaiense finally predominated, but when the ratio was 4000 ： 400, A. tamarense finally predominated.