水生生物学报2018，Vol.42Issue(3)：616-621,6.DOI:10.7541/2018.077
镉对大型溞摄食能力和相关生理指标的影响
EFFECT OF CADMIUM ON THE FEEDING CAPACITY AND PHYSIOLOGICAL STATUS OF DAPHNIA MAGNA
摘要
Abstract
To investigate the effects of cadmium(Cd2+)on the feeding capacity and its mechanism of water flea,Daph-nia magna,three experimental groups with different Cd2+concentrations(0.01 mg/L,0.05 mg/L and 0.09 mg/L)and one control group were set up in this study, and these groups were exposed for 24h and 48h, respectively. The effects of Cd2+levels on the feeding and filtration rate, tissues accumulation of Cd2+, total antioxidant capacity (T-AOC), con-tents of malonyldialdehyde(MDA),and the activities of acetylcholine esterase(AChE)in D.magna were analyzed. The results showed that(1)the feeding and filtration rates of D.magna decreased with increasing Cd2+concentrations. Especially,when the D.magna was exposed to 0.09 mg/L Cd2+for 48h,the feeding and filtration rates dropped drama-tically (P<0.05, P<0.01), with the feeding rate decreasing by 43.89% compared to the control group. (2) With the in-crease of Cd2+concentration, the accumulation of Cd in tissues was significantly higher in the experimental groups than that in the control group. (3) The total antioxidant capacity (T-AOC) and content of MDA in the water flea increased gradua-lly with the concentration level of Cd2+. In the group with Cd2+concentration of 0.09 mg/L, the levels of T-AOC and MDA increased significantly (P<0.05) compared to the control group. T-AOC was negatively correlated with the feed-ing rate whose correlation coefficient R2were 0.9521 and 0.9389, respectively. (4) The activity of AChE decreased with increasing Cd2+concentration,especially when D.magna were exposed to higher concentrations of 0.05 and 0.09 mg/L (P<0.05). The results indicated that Cd2+stress not only caused oxidative damage to water flea, but also induced the ab-normal conduction function to the nerve system,which would result in inhibition of feeding behavior in D.magna.关键词
大型溞/摄食率/滤水率/生理指标/镉Key words
Daphnia magna/Feeding rate/Filtration rate/Physiological status/Cadmium分类
资源环境引用本文复制引用
王茜,郭鹄飞,王兰..镉对大型溞摄食能力和相关生理指标的影响[J].水生生物学报,2018,42(3):616-621,6.基金项目
山西省特色学科重点项目(2011-SXDX-SWX-003)资助[Supported by the Special Subject and Key Project of Shanxi Province(2011-SXDX-SWX-003)] （2011-SXDX-SWX-003）
