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.

假单核生物是海洋群落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。在楚科奇海发现的关于微核生物的研究很少。这项工作显示了2012年仲夏（七月）和初秋（九月）对楚科奇海南部水域中微微核生物的群落分布和组成与理化因子之间的关系。以Illumina 18S V4 rDNA元条形码为主要研究对象。工具。在7月份，主要的微生物种类有Mamiellophyceae，Dinophyceae和Trebouxiophyceae，其中包括Micromonas，Prasinoderma，Telonema，Amoebophrya，Bathycoccus，Picomonas，和Bolidomonas代表主属。在九月份，Trebouxiophyceae超过了Dinophyceae，成为第二大主要微生物类别，其中Micromonas，Prasinoderma，Bathycoccus，Bolidomonas，Telonema，Choricystis和Diaphanoeca代表了主要属。水量是决定微核生物的群落组成和多样性的主要因素。丰Bathycoccus被发现与阿拉斯加沿岸水和的高度相关Prasinoderma，Bolidomonas，并Diaphanoeca与白令海水。仲夏时水的硝酸盐和磷酸盐含量以及初秋时的溶解氧和温度是影响皮多核生物群落丰富度的主要因素。