Characterizing coastal phytoplankton seasonal succession patterns on the West Antarctic Peninsula
Characterizing coastal phytoplankton seasonal succession patterns on the West Antarctic Peninsula
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描述西南极半岛沿海浮游植物季节演替模式
DOI：
10.1002/lno.12314
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发表时间：
2023
影响因子：
4.5
通讯作者：
Schofield, Oscar
中科院分区：
文献类型：
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作者：
Nardelli, Schuyler C.;Gray, Patrick C.;Stammerjohn, Sharon E.;Schofield, Oscar
在南极西部半岛（WAP）沿海水域，南半球春季末大量浮游植物大量繁殖，为高产的海洋生态系统提供了燃料。然而，WAP 的大气和海洋温度正在上升，冬季海冰范围和持续时间正在减少，而夏季 WAP 北部的浮游植物生物量已经减少并转向较小的细胞。为了更好地理解这些关系，在南极洲帕尔默站，使用成像 FlowCytobot 来表征叶绿素年低（2017-2018）和高（2018-2019）期间与物理驱动因素（例如海冰和大气水）相关的季节性（春季至秋季）浮游植物群落组成和细胞大小。较短的海冰季节和早期快速退缩导致浮游植物生物量较低，硅藻比例较低（2017-2018年），而较长的海冰季节和较晚的长期退缩导致相反的结果（2018-2019年）。尽管存在这些差异，浮游植物的季节性演替在这两年中是相似的：（1）春季海冰消退期间出现大细胞中心硅藻华； (2) 夏季高峰阶段，由混合营养型隐植物组成，光照和花后有机质增加； （3）夏末阶段由小型（< 20μm）硅藻和混合鞭毛虫组成，风驱动的营养物质再悬浮增加。此外，从 11 月到 4 月，细胞直径随着这两年大气水的增加而减小。海冰、融水和浮游植物物种组成之间的紧密耦合表明，WAP 的持续变暖将影响浮游植物的季节性动态，进而影响季节性食物网动态。
In coastal West Antarctic Peninsula (WAP) waters, large phytoplankton blooms in late austral spring fuel a highly productive marine ecosystem. However, WAP atmospheric and oceanic temperatures are rising, winter sea ice extent and duration are decreasing, and summer phytoplankton biomass in the northern WAP has decreased and shifted toward smaller cells. To better understand these relationships, an Imaging FlowCytobot was used to characterize seasonal (spring to autumn) phytoplankton community composition and cell size during a low (2017–2018) and high (2018–2019) chlorophyllayear in relation to physical drivers (e.g., sea ice and meteoric water) at Palmer Station, Antarctica. A shorter sea ice season with early rapid retreat resulted in low phytoplankton biomass with a low proportion of diatoms (2017–2018), while a longer sea ice season with late protracted retreat resulted in the opposite (2018–2019). Despite these differences, phytoplankton seasonal succession was similar in both years: (1) a large‐celled centric diatom bloom during spring sea ice retreat; (2) a peak summer phase comprised of mixotrophic cryptophytes with increases in light and postbloom organic matter; and (3) a late summer phase comprised of small (< 20μm) diatoms and mixed flagellates with increases in wind‐driven nutrient resuspension. In addition, cell diameter decreased from November to April with increases in meteoric water in both years. The tight coupling between sea ice, meltwater, and phytoplankton species composition suggests that continued warming in the WAP will affect phytoplankton seasonal dynamics, and subsequently seasonal food web dynamics.
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DOI：
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发表时间：
2022
期刊：
Elementa: Science of the Anthropocene
影响因子：
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作者：
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DOI：
10.1098/rsta.2017.0171
发表时间：
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期刊：
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
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影响因子：
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DOI：
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发表时间：
2021
期刊：
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