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| 1 | Pollutant toxicology with respect to microalgae and cyanobacteria显示文摘Microalgae and cyanobacteria are fundamental components of aquatic ecosystems.Pollution in aquatic environment is a worldwide problem.Toxicological research on microalgae and cyanobacteria can help to establish a solid foundation for aquatic ecotoxicological assessments.Algae and cyanobacteria occupy a large proportion of the biomass in aquatic environments;thus,their toxicological responses have been investigated extensively.However,the depth of toxic mechanisms and breadth of toxicological investigations need to be improved.While existing pollutants are being discharged into the environment daily,new ones are also being produced continuously.As a result,the phenomenon of water pollution has become unprecedentedly complex.In this review,we summarize the latest findings on five kinds of aquatic pollutants,namely,metals,nanomaterials,pesticides,pharmaceutical and personal care products(PPCPs),and persistent organic pollutants(POPs).Further,we present information on emerging pollutants such as graphene,microplastics,and ionic liquids.Efforts in studying the toxicological effects of pollutants on microalgae and cyanobacteria must be increased in order to better predict the potential risks posed by these materials to aquatic ecosystems as well as human health. | Tao Lu Qi Zhang Zhenyan Zhang Baolan Hu Jianmeng Chen Jun Chen Haifeng Qian | 2021 | Journal of Environmental Sciences2021，33，1： | 4 |
| 2 | Nutrients regeneration pathway, release potential, transformation pattern and algal utilization strategies jointly drove cyanobacterial growth and their succession显示文摘In order to better understand the contribution of nutrients regeneration pathway, release potential and transformation pattern to cyanobacterial growth and succession, 7 sampling sites in Lake Chaohu with different bloom degree were studied every two months from February to November 2018. The carbon, nitrogen(N) and phosphorus(P) forms or fractions in surface, interstitial water and sediments as well as extracellular enzymatic activities, P sorption, specific microbial abundance and community composition in sediments were analyzed. P regeneration pathway was dominated by iron-bound P desorption and phosphorus-solubilizing bacteria solubilization in severe-bloom and slight-bloom area respectively, which both resulted in high soluble reactive phosphorus(SRP) accumulation in interstitial water. However, in severe-bloom area, higher P release potential caused the strong P release and algal growth, compared to slight-bloom area. In spring, P limitation and N selective assimilation of Dolichospermum facilitated nitrate accumulation in surface water, which provided enough N source for the initiation of Microcystis bloom. In summer, the accumulated organic N in Dolichospermum cells during its bloom was re-mineralized as ammonium to replenish N source for the sustainable development of Microcystis bloom. Furthermore, SRP continuous release led to the replacement of Dolichospermum by Microcystis with the advantage of P quick utilization, transport and storage. Taken together, the succession from Dolichospermum to Microcystis was due to both the different forms of N and P in water column mediated by different regeneration and transformation pathways as well as release potential, and algal N and P utilization strategies. | Hui Li Chunlei Song Liu Yang Hangdao Qin Xiuyun Cao Yiyong Zhou | 2021 | Journal of Environmental Sciences2021，33，5： | 2 |
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