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文章摘要

不同藻密度条件下铜绿微囊藻与大型溞的相互影响

A Study on the Interaction between MicrocystisAeruginosa and Daphnia Magna

DOI：

英文关键词: Microcystis aeruginosa Daphnia magna Inhibition test Toxicology test

基金项目:

作者	单位
徐鑫李	南京师范大学环境学院，江苏省水土环境生态修复工程实验室，江苏省地理信息资源开发与利用协同创新中心
王国祥	南京师范大学环境学院，江苏省水土环境生态修复工程实验室，江苏省地理信息资源开发与利用协同创新中心
李时银	南京师范大学环境学院，江苏省水土环境生态修复工程实验室，江苏省地理信息资源开发与利用协同创新中心

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中文摘要:

通过设置模拟摄食试验，使用铜绿微囊藻藻液及滤液对大型溞同时进行急性毒理试验，探讨了不同藻密度条件下铜绿微囊藻与大型溞之间的相互影响。结果表明，大型溞的摄食行为对铜绿微囊藻的生长有抑制，抑制作用随藻密度升高而下降，中、低藻密度（1.01×108 mL-1、1.01×107 mL-1）下的抑制率分别为54.6%、65.7%，高密度（1.01×109 mL-1）下的抑制率为29.7%。同时，铜绿微囊藻对大型溞有毒性作用，在毒理试验中，藻液组24 h和48 h的LC50值分别为0.455×107 mL-1和0.036×107 mL-1，滤液组24 h和48 h的LC50值分别为1.299×107 mL-1和0.179×107 mL-1。藻液组的LC50值明显低于滤液组，结合镜检表明，大型溞摄食铜绿微囊藻，铜绿微囊藻对大型溞的毒性影响以胞内毒素为主。在藻-溞微生态系统中，当藻密度低时，大型溞种群对铜绿微囊藻的去除效果显著，藻细胞被摄食殆尽后大型溞迅速死亡；当藻密度适中时，大型溞种群对铜绿微囊藻的去除效果良好，存活时间最长；当藻密度高时，大型溞种群受藻毒素强烈影响，短时间内死亡殆尽，对铜绿微囊藻的去除效果差。

英文摘要:

In this paper, the mutual influence between Microcystis aeruginosa and Daphnia magna under the condition of different algal densities was discussed through the simulation feeding test and toxicology test. The results showed that the grazing behaviour of D. Magna had inhibitory effect on the growth of Microcystis aeruginosa, and the inhibition decreased with the algal density increase. The inhibition rates were 65.7%, 54.6% and 29.7% at low, medium and high algal density （which were 1.01×107 mL-1、1.01×108 mL-1 and 1.01×109 mL-1 respectively）. Meanwhile, Microcystis aeruginosa had toxic effects on D. Magna. In the toxicity test, the 24 h LC50 and 48 h LC50 of algae liquid group were 0.455×107 mL-1 and 0.036×107 mL-1. The 24 h LC50 and 48 h LC50 of filtrate group were 1.299×107 mL-1 and 0.179×107 mL-1.〖JP〗 The half lethal concentration of the algae liquid group were significantly lower than that of filtrate group. Microscopic examination revealed that intracellular toxin tended to be the main factor for Microcystis aeruginosa affecting D. Magna. In the ecosystem of Microcystis 〖JP3〗aeruginosa and D. Magna, the removal effect of Microcystis aeruginosa by D. Magna was remarkable under the condition of low algal density. 〖JP〗〖FL)〗 D. magna quickly died when the algal cells being eaten up. Under the condition of medium algal density, the removal effect was fine and the D. Magna survived longest. Under the condition of high algal density, D. Magna was strongly influenced by Microcystis aeruginosa and died out in a short period of time, the removal effect was poor.

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