The Key Laboratory for Polar Science MNR, Shanghai, China.
Laboratory of Marine Ecosystem and Biogeochemistry, Second Institute of Oceanography, MNR, Hangzhou, 310012, China.
Extremophiles. 2021 May;25(3):235-248. doi: 10.1007/s00792-021-01222-3. Epub 2021 May 3.
Picoeukaryotes constitute an important component of the living biomass of oceanic communities and play major roles in biogeochemical cycles. There are very few studies on picoeukaryotes found in the Chukchi Sea. This work shows the relationship between community distribution and composition of picoeukaryotes residing in water masses and physicochemical factors in the southern Chukchi Sea studied in both midsummer (July) and early autumn (September), 2012. Illumina 18S V4 rDNA metabarcoding were used as the main tool. In July, Mamiellophyceae, Dinophyceae, and Trebouxiophyceae were the main microbial classes, with Micromonas, Prasinoderma, Telonema, Amoebophrya, Bathycoccus, Picomonas, and Bolidomonas representing the main genera. In September, Trebouxiophyceae surpassed Dinophyceae and was the second main microbial class, with Micromonas, Prasinoderma, Bathycoccus, Bolidomonas, Telonema, Choricystis, and Diaphanoeca representing the main genera. Water mass was the primary factor determining the community composition and diversity of picoeukaryotes. Abundance of Bathycoccus was found to be highly correlated with Alaskan Coastal Water and that of Prasinoderma, Bolidomonas, and Diaphanoeca with Bering Seawater. Nitrate and phosphate content of water in midsummer and dissolved oxygen (DO) and temperature in early autumn were the main factors that shaped the abundance of the picoeukaryote community.
微微型真核生物是海洋生物群落中生物量的重要组成部分，在生物地球化学循环中起着重要作用。在楚科奇海发现的微微型真核生物研究非常少。本工作展示了 2012 年 7 月和 9 月中夏（7 月）和初秋（9 月）期间，在南楚科奇海，生活在水体中的微微型真核生物群落分布和组成与理化因子之间的关系。Illumina 18S V4 rDNA 宏条形码被用作主要工具。7 月，Mamiellophyceae、Dinophyceae 和 Trebouxiophyceae 是主要的微生物类群，主要属为 Micromonas、Prasinoderma、Telonema、Amoebophrya、Bathycoccus、Picomonas 和 Bolidomonas。9 月，Trebouxiophyceae 超过 Dinophyceae，成为第二大主要微生物类群，主要属为 Micromonas、Prasinoderma、Bathycoccus、Bolidomonas、Telonema、Choricystis 和 Diaphanoeca。水团是决定微微型真核生物群落组成和多样性的主要因素。发现 Bathycoccus 的丰度与阿拉斯加沿海水高度相关，而 Prasinoderma、Bolidomonas 和 Diaphanoeca 的丰度与白令海水相关。中夏的水硝酸盐和磷酸盐含量以及初秋的溶解氧（DO）和温度是塑造微微型真核生物群落丰度的主要因素。
