Structure and community composition of algae attached to different microplastic substrates
LI Chen-xi1, GAO Yu-xuan1, ZHANG Jia-qi1, XU Liu-xuan1, LIU Zhi-lin1,2, MIAO Ling-zhan1,2, HOU Jun1,2
1. Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, Hohai University, Nanjing 210098, China; 2. College of Environment, Hohai University, Nanjing 210098, China
Abstract:To investigate the structure of biofilms and community composition of algae attached to the surface of common microplastic substrates, four types of microplastics (polypropylene (PP), polyvinyl chloride (PVC), polyethylene (PE), polyethylene terephthalate (PET) and a natural substrate (cobblestone) were selected to conduct field incubation of biofilms. The result showed that the morphology and structure of the biofilms were different between cobblestones and microplastic substrates, as well as in the contents and composition of algae. The chlorophyll-a contents in algae attached to the microplastic substrates were generally lower than those in natural substrate. Moreover, different algae content and functional characteristics were also observed from thefour microplastics. The highest chlorophyll-a content of algae was observed on PET substrate (613.7μg/L) and the lowest on PP substrate (492.5μg/L), although the maximal quantum yield of algae on PP substrate was the highest (0.443). These results suggested that the microplastic substrates could influence the growth and primary production of periphytic algae, which might further affect the microbial-associated carbon cycling in aquatic systems, water purification, and pollution treatment.
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