biostudies-literatureWang JNational Natural Science Foundation of China-Shandong Joint FundNational Natural Science Foundation of ChinaNational Natural Science Foundation of China-Shandong Joint Fund for Marine Ecology and Environmental Sciences, ChinaNational Key Research and Development Program of China3985https://www.ebi.ac.uk/biostudies/studies/S-EPMC9998616biostudies-literatureUnknown13(1)The effects of increased UV-B radiation on macroalgae have been widely studied, but knowledge concerning the response of communities of algal epiphytic bacteria to increased UV-B radiation and differences between male and female algae is still lacking. Via 16S rDNA high-throughput sequencing technology, changes in the epiphytic bacterial communities on male and female S. thunbergii under increased UV-B radiation were studied in the lab. Under different UV-B radiation intensities, although the α diversity and community composition of epiphytic bacteria changed little, the β diversity indicated that the community structure of bacteria on S. thunbergii was obviously clustered, and the relative abundance of dominant bacteria and indicator species changed considerably. There were unique bacteriScientific reportsEffects of UV-B radiation on epiphytic bacterial communities on male and female Sargassum thunbergii.PMC9998616U1606404U1806213420061442019YFD0901204Yang ZXue SXiao HWang JLu PSun YTang XfalseEffects of UV-B radiation on epiphytic bacterial communities on male and female Sargassum thunbergii.The effects of increased UV-B radiation on macroalgae have been widely studied, but knowledge concerning the response of communities of algal epiphytic bacteria to increased UV-B radiation and differences between male and female algae is still lacking. Via 16S rDNA high-throughput sequencing technology, changes in the epiphytic bacterial communities on male and female S. thunbergii under increased UV-B radiation were studied in the lab. Under different UV-B radiation intensities, although the α diversity and community composition of epiphytic bacteria changed little, the β diversity indicated that the community structure of bacteria on S. thunbergii was obviously clustered, and the relative abundance of dominant bacteria and indicator species changed considerably. There were unique bacteri2023-01-01T00:00:00Z2023 Mar2025-04-19T12:38:20.321Z2025-04-19T12:38:20.321ZS-EPMC99986163689468310.1038/s41598-022-26494-3