高通量测序分析福建平潭近海夜光藻藻华对海洋浮游生物群落多样性的影响效应OA北大核心CSCDCSTPCD

Noctiluca scintillans blooms frequently occur in the coastal waters of China;however,the impact of N.scintillans on the marine planktonic community structure and diversity remains unclear.In this study,high-throughput sequencing was employed to investigate the effects of high-density N.scintillans on the community structure and diversity of coastal planktonic organisms in the coastal waters of Pingtan,encompassing prokaryotes and eukaryotes.The diversity and number of species at the bloom stations were significantly lower than those at the non-bloom stations.Among prokaryotes,Proteobacteria dominated at all stations,and Acinetobacter replaced Yoonia-Loktanella at the bloom stations as the dominant genus.Among eukaryotes,Dinoflagellata replaced Ar-thropoda as the dominant phylum at the bloom stations,and the relative abundance of planktonic copepods,such as Oithona similis and Paracalanus parvus,at the bloom stations was significantly lower than those at the non-bloom stations;however,Parallelostrombidium conicum became the second most abundant species at the bloom stations.Correlation analysis indicated that algal-associated bacteria(e.g.,Acinetobacter,Thioclava,Marivita,and Flavo-bacterium)were highly correlated with N.scintillans,whereas most eukaryotic algae,including chlorophyta,dia-toms,and other dinoflagellates,were negatively correlated with N.scintillans.The results demonstrated that a high density of N.scintillans has a significant impact on the structure and diversity of marine planktonic organisms.Moreover,for prokaryotes,algal-associated bacteria become the dominant bacterial group at the bloom stations,and they may play a key role in the N.scintillans bloom decline stage.However,for eukaryotes,the feeding pressure of N.scintillans may be the primary reason for the significant decline in the diversity of marine phytoplankton and zooplankton.