东海原甲藻对尿素的吸收动力学与利用特性  

Uptake kinetics and utilization characteristics of Prorocentrum donghaiense for urea

作　　者：徐宁[1] 秦俊莲[1] 孙树刚[1] 段舜山[1] 

机构地区：[1]暨南大学水生生物研究中心,广州510632

出　　处：《深圳大学学报（理工版）》2012年第5期455-460,共6页Journal of Shenzhen University(Science and Engineering)

基　　金：国家自然科学基金资助项目(40776078;U1133003)~~

摘　　要：以中国东海大规模赤潮发生海区的东海原甲藻为实验材料,研究其对尿素的吸收动力学和利用特性.结果发现,东海原甲藻对尿素N的最大吸收速率(3.184/h)高于氨态N(2.800/h);东海原甲藻在以CO(NH2)2为唯一氮源时的最大比生长速率(0.685/d)超过NO3-(0.663/d);虽然东海原甲藻对NO3-和NH4+的亲和力略高于CO(NH2)2,但由于东海原甲藻具备快速吸收和利用尿素的能力,在无机氮含量较低且尿素丰富的近岸水体中具有竞争优势.指出尿素含量的上升可能是引发东海原甲藻赤潮的重要诱因.A strain of Prorocentrum donghaiense was isolated from large-scale red tide waters of East China Sea. The growth rates and uptake kinetics of this harmful algal bloom species, with urea as the sole N source, were examined in laboratory cultures. The resuhs show that, the maximum uptake rate of P. donghaiense for urea （3. 184/h） is higher than that of ammonium （2. 800/h）, and the maximum growth rate ofP. donghaiense for urea （0. 685/d） is also higher than that of nitrate （0. 663/d）. It implies that P. donghaiense had higher affinities for nitrate and ammonium than urea; however, P. donghaiense shows higher uptake rate and growth rate with suf- ficient urea in the ambient environments. As P. donghaiense possesses an effective capability in uptake and utili- zation for urea, the rise of urea in the coastal waters from anthropogenic sources would be beneficial to the prolif- eration of the harmful species, contributing to increased occurrences of harmful algal blooms （HABs）.

关 键 词：海洋生态学 有害赤潮 东海原甲藻 尿素 吸收动力学 中国东海 

分 类 号：Q178[生物学—水生生物学] Q142[生物学—普通生物学]