Small phytoplankton dominate western North Atlantic biomass
Small phytoplankton dominate western North Atlantic biomass
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DOI：
10.1038/s41396-020-0636-0
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发表时间：
2020-03-30
期刊：
影响因子：
11
通讯作者：
Giovannoni, Stephen J.
中科院分区：
文献类型：
--
作者：
Bolanos, Luis M.;Karp-Boss, Lee;Giovannoni, Stephen J.
北大西洋浮游植物春季水华是由物理，化学和生物季节性驱动的年度周期的顶峰。尽管其对全球碳循环的重要贡献，在冬季和春季之间的浮游生物群落组成的过渡几乎没有在北大西洋检查。浮游植物组成在初冬进行了比较，捕获随后的春季盛开的高潮纬度样带。扩增子序列变体（ASV）、成像流式细胞术和流式细胞术提供了浮游植物多样性的概览。浮游植物群落并不均匀，在整个网站的研究，而是映射到亚极地和亚热带影响的北大西洋的水团明显的保真度。在大多数站点，直径小于20微米的细胞是浮游植物生物量的主要贡献者。冬季浮游植物群落以蓝藻和微微型真核植物为主。这些过渡到更多样化和动态的春季社区，其中皮科和纳米植物真核生物，包括许多prasinophyte藻类，占主导地位。硅藻，这往往被认为是占主导地位的浮游植物在水华，是贡献者，但不是生物量的主要组成部分。我们发现，不同的，小的浮游植物类群是出乎意料的常见在北大西洋西部和区域的影响发挥了很大的作用，在调节群落过渡的季节性进展的水华。
The North Atlantic phytoplankton spring bloom is the pinnacle in an annual cycle that is driven by physical, chemical, and biological seasonality. Despite its important contributions to the global carbon cycle, transitions in plankton community composition between the winter and spring have been scarcely examined in the North Atlantic. Phytoplankton composition in early winter was compared with latitudinal transects that captured the subsequent spring bloom climax. Amplicon sequence variants (ASVs), imaging flow cytometry, and flow-cytometry provided a synoptic view of phytoplankton diversity. Phytoplankton communities were not uniform across the sites studied, but rather mapped with apparent fidelity onto subpolar- and subtropical-influenced water masses of the North Atlantic. At most stations, cells < 20-mu m diameter were the main contributors to phytoplankton biomass. Winter phytoplankton communities were dominated by cyanobacteria and pico-phytoeukaryotes. These transitioned to more diverse and dynamic spring communities in which pico- and nano-phytoeukaryotes, including many prasinophyte algae, dominated. Diatoms, which are often assumed to be the dominant phytoplankton in blooms, were contributors but not the major component of biomass. We show that diverse, small phytoplankton taxa are unexpectedly common in the western North Atlantic and that regional influences play a large role in modulating community transitions during the seasonal progression of blooms.