Studies on Toxicity and Bioaccumulation of Cu2+ in Alga Scenedesmus obliquus and Its Effect on Life Table Demography of the Rotifer Brachionus calyciflorus
Xiao-Ping Xu 1, 2  
,   Xiao-Fan Yang 1  
,   Xue-Yu Wei 1  
,   Yi-Long Xi 2, 3,   Xing-Ming Wang 2, 4
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College of Civil Engineering and Architecture, Anhui Polytechnic University, Wuhu 241000, China
Center of Cooperative Innovation for Recovery and Reconstruction of Degraded Ecosystem in Wanjiang Basin Co-founded by Anhui Province and Ministry of Education, Wuhu 241000, China
College of Life Sciences, Anhui Normal University, Wuhu 241000, China
School of Earth and Environment, Anhui University of Science and Technology, Huainan 232001, China
Xiao-Ping Xu   

College of Civil Engineering and Architecture, Anhui Polytechnic University, Wuhu 241000, China, Beijing Middle Road, Wuhu, Anhui Province, China, 241000, Wuhu, China
Submission date: 2020-03-23
Final revision date: 2020-05-31
Acceptance date: 2020-06-05
Online publication date: 2020-09-08
Publication date: 2020-11-10
Pol. J. Environ. Stud. 2021;30(1):893–901
The algae- rotifer food chain plays a pivotal role in freshwater dynamics, as well as assessing toxicity in aquatic environments. We investigated the changes in algal cell density, photosynthetic pigments, superoxide dismutase (SOD) activity, and Cu2+ bioaccumulation after exposing Scenedesmus obliquus to 3.75, 7.5, 15, 30, and 60 μg/L Cu2+ for 72 h. We also studied the effects of Cu2+-exposed algae on the life table demographic parameters of Brachionus calyciflorus after 48 and 96 h of feeding. The results found that, when compared with the control, 3.75 μg/L Cu2+ significantly increased algal cell density after 48 h, while 60 μg/L Cu2+ significantly reduced algal cell density after 24 h. Increases in exposure time resulted in the chlorophyll-a, chlorophyll-b, and carotenoids showing an initial decrease and then increasing trend when compared to the control. Low concentrations of Cu2+ tended to induce increased SOD activity in algal cells, while high concentrations inhibited SOD activity. With increasing Cu2+ concentration and time, the Cu2+ bioaccumulation in algal cells increased proportionally. The highest bioaccumulation value was 1205 μg/g in 60 μg/L Cu2+ treatment after 72 h of exposure, 376.28% higher than pre-exposure level. Algae in the 3.75 μg/L Cu2+ treatment group significantly inhibited the population growth of B. calyciflorus, algae in the 60 μg/ Cu2+ group had the strongest inhibitory effect on the population growth of rotifers, and algae in the 30 μg/L Cu2+ group significantly increased the offspring mictic rate. The rotifer population produced adaptive responses to Cu2+-exposed algae stress after 96 h of feeding, unlike after 48 h.