Impact of Microplastic Exposure on the Antioxidant Enzyme Activity and Intestinal Microbiota Composition of Bellamya aeruginosa
In order to reveal the ecotoxic effects of microplastics,Bellamya aeruginosa was selected as the model organism,and two kinds of microplastics with different particle sizes(100 nm and 10 μm)were selected for a 12-day exposure experiment.The activity of superoxide dismutase(SOD)and the reduced to oxidized glutathione ratio(GSH/GSSG)in the visceral mass were monitored,and the impacts of microplastic exposure on the intestinal microbiota were analyzed.The results showed that compared with 10 μm microplastics,100 nm microplastics could significantly induce SOD activity and continuously reduce the GSH/GSSG ratio,resulting in more serious oxidative damage.At the same time,100 nm microplastics significantly affected the intestinal microbial community composition,resulting in an increase in a diversity,a decrease in probiotics,and an increase in pathogenic bacteria.It can be seen that microplastics,especially nano-plastics,can destroy the antioxidant defense line and change the structure of intestinal microbial community in B.aeruginosa,thus producing potential ecotoxic effects.
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