2种赤潮藻种群向海洋尖尾藻种群的演替

Population succession of two red tide microalgae species to Oxyrrhis marina

实验室内分别研究了海洋卡盾藻培养液(细胞初始密度为0.11×105 cells/mL)接种不同初始密度海洋尖尾藻(分别为0.17×104,0.50×104,0.64×104 cells/mL)、东海原甲藻培养液(细胞初始密度为2.80×105cells/mL)接种不同初始密度海洋尖尾藻(分别为0.13×104,0.38×104,0.63×104 cells/mL)后,分别培养15d过程中海洋卡盾藻种群和东海原甲藻种群向海洋尖尾藻种群演替的过程。结果表明,随着海洋尖尾藻细胞初始密度增大,海洋尖尾藻种群达到稳定期所需时间缩短,分别为接种后第6,5天和第3天,海洋卡盾藻全部死亡时间缩短分别为接种后第7天、第6天和第4天;同样,随着海洋尖尾藻细胞初始密度增大,海洋尖尾藻种群达到稳定期以及东海原甲藻被摄食完毕所需时间均缩短。在试验设计密度范围内,海洋卡盾藻种群和东海原甲藻种群均向海洋尖尾藻种群发生了演替,海洋尖尾藻扰动摄食海洋卡盾藻和海洋尖尾藻过滤摄食东海原甲藻分别是海洋卡盾藻种群和东海原甲藻种群向海洋尖尾藻种群演替的重要原因之一。

Progresses of population succession of Chattonella marina and Prorocentrum donghaiense to Oxyrrhis marina were investegated by inoculating O.marinain culture media of C.marinaand P.donghaiense,respectively.The results show that with the increase of the initial density of O.marina（0.17×10^4,0.50×10^4 and 0.64×10^4 cells/mL,respectively）,the time that the population of O.marinareached the stationary phase required shorter,were 6days,5days and 3days,respectively,and the death time of C.marina（the initial cell density was 0.11×10^5 cells/mL）became shorter,were 7days,6days and 4days after inoculated by O.marinarespectively.With the increase of the initial density of O.marina（0.13×10^4,0.38×10^4 and 0.63×10^4 cells/mL,respectively）,the time that the population of O.marina reached the stationary phase and the time that the population of P.donghaiense（the initial cell density was 2.80×10^5 cells/mL）fed up by O.marina required shorter,respectively.During the 15-day culture period,C.marina populations and P.donghaiense populations were evolved to O.marinapopulations within the concentrations designed in co-culture in this experiment,respectively.Disturbance feeding was the important reason for succession of C.marinaand filter feeding was the important reason for succession of P.donghaiense to O.marina,respectively.