Spatial characteristics of microeukaryote community structure in floating raft aquaculture area of Gouqi Island
BIAN Wenhua
QIU Jichen
SONG Quanjian
ZHANG Jian
WEI Yuanyuan
ZHANG Man
FENG Meiping
WANG Zhenhua
LIN Jun
ZHANG Shouyu
Abstract：Microeukaryotes including algae,protozoa and fungi exhibit high abundance,wide distribu-tion and high diversity,which play crucial roles in marine ecosystems.In September 2020,we collected 16 samples from six stations in the typical raft aquaculture area of Gouqi Island,the East China Sea.Microeukaryote communities were analyzed using 18S rDNA high-throughput sequencing to compare their spatial distribution across three habitats including surface seawater,bottom seawater and sedi-ment samples.Our results showed that diatom and dinoflagellates dominate the phytoplankton commu-nity,and ciliates and Noctiluca dominate the zooplankton community.As for microeukaryotes,the dominant species of microeukaryotes were Cerataulina pelagica,Noctiluca scintillans,Alexandrium tamarense,Sargassum fusiforme and Alexandrium catenella.A significant difference among microeu-karyote communities was observed between seawater and sediment samples.The microeukaryote com-munities in sediment samples showed a higher Shannon and evenness diversity than those in seawater samples.Compared with bottom seawater,microeukaryote communities in surface seawater exhibited higher Shannon and evenness diversities but lower species abundance.Redundancy analysis domonstrat-ed that the diversity indices and dominant species distribution in surface seawater were strongly influ-enced by temperature,salinity and Chi a concentration.At station WRC,higher abundances of dia-toms and Phaeophyceae were positively correlated with Chl a concentration.Overall,our findings pro-vided baseline data for researches on the community change and ecological function of microeukaryotes in aquaculture areas of East China Sea.
Keywords：microeukaryote18S rDNAcommunity structurefloating raft aquacultureGouqi Island
Publication Date：2025-12-30
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：11( 90-100 )