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      Seasonal Variations of Picoeukaryote Community Structure in Zhoushan Fishing Ground, East China Sea

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          Picoeukaryotes (< 2–3 μm) are major oceanic primary producers and play a crucial role for the functioning of marine ecosystems. However, the community structure of such communities remains poorly understood, especially in the East China Sea (ECS). We investigated the seasonal variations of abundance and diversity of picoeukaryotes, and recorded environmental variables, along a transect in Zhoushan Fishing Ground. High-throughput sequencing was used for sequencing the V4–V5 variable region within the 18S rRNA gene to analyze genetic diversity and relative abundance of picoeukaryotes. A total of 40 phyla, 68 classes, 99 orders, 126 families, and 140 genera were observed. The estimated richness and diversity indices were both higher in each season. The composition and dominant picoeukaryotes changed significantly at the class level with the seasons alternating. Basidiomycota, Ciliophora, Ascomycota and Cryptomonadales were observed throughout the year. The Linear Discriminant Analysis (LDA) revealed the predominant discriminant taxa of four seasonal groups. Redundancy analysis (RDA) showed that NO 2 and salinity played very important roles to picoeukaryotes for all the spring samples and DS5 sample in winter, PO 4 3− and pH affected mostly picoeukaryotes for winter samples and autumn samples.

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          Author and article information

          Journal of Ocean University of China
          Science Press and Springer (China )
          15 November 2020
          01 December 2020
          : 19
          : 6
          : 1471-1479
          1National Engineering Research Center of Marine Facilities Aquaculture, Zhejiang Ocean University, Zhoushan 316022, China
          2Chinese Research Academy of Environmental Sciences, Institute of Water Environment Science, Beijing 100020, China
          3Institute of Zoology, Chinese Academy of Sciences, Beijing 100000, China
          Author notes
          *Corresponding author: ZHAO Shujiang, Tel: 0086-580-2556480, E-mail: sjzhao@

          # The two authors contributed equally to this work.

          Copyright © Ocean University of China, Science Press and Springer-Verlag GmbH Germany 2020.

          The copyright to this article, including any graphic elements therein (e.g. illustrations, charts, moving images), is hereby assigned for good and valuable consideration to the editorial office of Journal of Ocean University of China, Science Press and Springer effective if and when the article is accepted for publication and to the extent assignable if assignability is restricted for by applicable law or regulations (e.g. for U.S. government or crown employees).

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