Binary toxicity of polystyrene nanoplastics and polybrominated diphenyl ethers to Arctic Cyanobacteria under ambient and future climates. (1st November 2022)

• Record Type: Journal Article
• Authors: Xin, Xiaying; Chen, Bing; Péquin, Bérangère; Song, Pei; Yang, Min; Song, Xing; Zhang, Baiyu
• Is Part Of: Water research. Volume 226(2022)
• Publication Date: 2022-11-01
• Subjects: Arctic cyanobacteria -- Nano-PS -- BDE-47 -- Climate change -- Hazardous effects; Water -- Pollution -- Research -- Periodicals; 363.7394
• DOI: 10.1016/j.watres.2022.119188
• Languages: English
• ISSNs: 0043-1354

Abstract

Highlights: The mixture had more hazardous effects on Arctic cyanobacteria than changing climate conditions. Joint exposure resulted in lower toxicity to Arctic cyanobacteria. The IA model simulated the binary toxicity better than the CA model. Total protein was a sensitive target for both exposures of mixtures and individuals. Oxidative stress for the mixture mainly resulted from the presence of nanoplastics. Abstract: Cyanobacteria are the predominant biota in the Arctic. Interactive effects on Arctic cyanobacteria between climate-change-shifting parameters and anthropogenic contaminants are largely unknown. We utilized a fractional factorial experiment and Arctic cyanobacteria Pseudanabaena biceps Strain PCCC_O-153 to capture the complexity of interacting climate factors, nano-polystyrene (nano-PS) and 2, 2´, 4, 4´-tetrabromodipenyl ether (BDE-47). The short-term binary toxicity of nano-PS and BDE-47 was then examined through experiments, toxicity units, and reference models. The toxic mechanism was further revealed through biochemical analyses and multivariate statistics. We found that BDE-47 and nano-PS had more hazardous effects than changing climate conditions. The mixture had antagonistic effects on PCCC_O-153, attributing to the aggregation of nano-PS, the adsorption of BDE-47, and the wrapping of both contaminants by released extracellular polymeric substances. Binary toxicity was caused by the chain reactions triggered by combining individual contaminants. Total protein was a sensitive target and positively correlated to chlorophyll pigment. Oxidative stress for the mixture mainly resulted from the presence of nano-PS. This is the first study to access the hazardous effects of a mixture of anthropogenic contaminants on Arctic cyanobacteria under ambient and future climates. Graphical Abstract: Image, graphical abstract