营养强化时褶皱臂尾轮虫对饵料微藻的摄食

Feeding of rotifer Brachionus plicatilis enriched with microalgae

选取适宜浓度利用单种微藻和混合微藻对轮虫进行营养强化,采用实验生态学方法研究了轮虫滤水率和摄食率的动态变化。结果表明:微藻浓度、微藻种类和培养时间均对轮虫的滤水率和摄食率有显著影响;轮虫对几种单种微藻的滤水率和摄食率均随培养时间的延长而下降,在实验条件下,6h内轮虫对3种微藻的滤水率大小顺序为小球藻>球等鞭金藻>牟氏角毛藻,12h内轮虫对3种微藻的滤水率大小顺序则为球等鞭金藻>小球藻>牟氏角毛藻;轮虫在混合微藻中的选择顺序为球等鞭金藻>小球藻>牟氏角毛藻。

By the methods of experimental ecology, this paper studied the dynamic changes of the filtration and ingestion rates of Brachionus plicatilis enriched with single and mixed microalgal diets at optimum concentrations. The microalgal concentration, microalgal species, and culture duration all had significant effects on the filtration and ingestion rates of B. plicatilis. The filtra- tion and ingestion rates of B. plicatilis to the diets decreased with increasing culture duration. Under the experimental conditions, the filtration rate of B. plicatilis to the microalgae within 6 hours was in the order of Chlorella sp. 〉 Isochrysis galbana 〉 Chaetoceros muelleri, while that within the whole experimental duration （12 hours） was Isochrysis galbana 〉 ChloreUa sp. 〉 Chaetoceros mueUeri. The predation of B. plicatilis erential order of Isochrysis galbana 〉 Chlorella sp. fed by mixed microalgal diet was with a pref- 〉 Chaetoceros muelleri.