Anticyclonic Eddy Driving Significant Changes in Prokaryotic and Eukaryotic Communities in the South China Sea

Mesoscale eddies play an important role in ocean energy and material transport. However, the effect of on bacterial eukaryotic community their ecological effects remains unclear, regarding anticyclonic (ACE). In this study, composition was examined across ACE South China Sea, using high-throughput sequencing 16S rRNA 18S gene. Environmental variables reflected hydrographic characteristics ACE, which enhanced diversity most water layers, relative to adjacent regions. Principal component analysis (PCoA) showed that communities had certain different compositions between inside outside eddy above 75 m water. An obvious increase abundance depth distribution small photosynthetic heterotrophic bacteria, such as SAR11, Prochlorococcus , Rhodospirillales Oceanospirillales. While decreased nutrient-rich phytoplankton (Bacillariophyta Mamiellophyceae), resulted more growth space for other eukaryotes prefer oligotrophic environment (especially Fungi, Dictyochophyceae, Synurophyceae). Canonical correlation (CCA) temperature, salinity, nitrate, phosphate nitrite significantly affected microbial community. The special temperature) shaped its specific microbe. This study shed light ACEs environmental conditions impact marine ecosystem structure.