Relative depths of the subsurface peaks of phytoplankton abundance conserved over ocean provinces
Relative depths of the subsurface peaks of phytoplankton abundance conserved over ocean provinces
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DOI：
10.1002/lno.12222
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发表时间：
2022-09
影响因子：
4.5
通讯作者：
Mitsuhide Sato;T. Shiozaki;F. Hashihama;T. Kodama;H. Ogawa;H. Saito;A. Tsuda;S. Takeda;K. Furuy
中科院分区：
文献类型：
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作者：
Mitsuhide Sato;T. Shiozaki;F. Hashihama;T. Kodama;H. Ogawa;H. Saito;A. Tsuda;S. Takeda;K. Furuy
对从太平洋和印度洋250多个站点收集的流式细胞仪数据进行了分析，以确定影响聚球藻、原绿球藻和小型真核生物（< 6 μm）地下丰度最大值的深度和幅度的因素。通过曲线拟合估计的每个浮游植物种群的峰值深度与地下叶绿素最大值（SCM）的深度密切相关。回归线的斜率表明，聚球藻、原绿球藻和小型真核生物的峰值深度分别为SCM深度的74% ± 1%、88% ± 1%和104% ± 1%（置信区间为95%）。这一趋势在太平洋和印度洋的不同海洋区基本上得到保持。在亚热带沃茨的硝酸盐贫化层中，聚球藻的高峰经常出现，这表明它们对再生和/或有机营养物的高亲和力。估计日辐照度收到的聚球藻和原绿球藻的峰值深度没有表现出明显的纬度趋势和相邻站之间的波动，而小型真核生物略有增加，向亚北极地区。目前的研究结果表明，聚球藻，原绿球藻和小型真核生物相对于SCM的峰值深度是全球平均保守的，这在很大程度上是符合他们获得光和营养物质的能力的差异。然而，绝对光照水平和营养盐浓度的峰值深度之间的相邻站变化很大，可能受到物理运动。
Flow cytometric data collected from more than 250 stations in the Pacific and Indian Oceans were analyzed to determine the factors affecting the depth and magnitude of the subsurface abundance maximum of Synechococcus, Prochlorococcus, and small eukaryotes (< 6 μm). The peak depth of each phytoplankton population estimated by curve fitting was strongly correlated with the depth of the subsurface chlorophyll maximum (SCM). The slope of the regression line demonstrated that the peak depths of Synechococcus, Prochlorococcus, and small eukaryotes were 74% ± 1%, 88% ± 1%, and 104% ± 1% of the SCM depth (with confidence interval of 95%), respectively. This trend was largely conserved across the different ocean provinces of the Pacific and Indian Oceans. The peaks of Synechococcus frequently appeared in the nitrate‐depleted layer of subtropical waters, suggesting their high affinity for regenerated and/or organic nutrients. The estimated daily irradiance received at the peak depths of Synechococcus and Prochlorococcus did not show a distinct latitudinal trend and fluctuated among neighboring stations, whereas that of small eukaryotes slightly increased toward the subarctic region. The present results show that the peak depths of Synechococcus, Prochlorococcus, and small eukaryotes relative to SCM were globally conserved on average, which is largely in line with the difference in their ability to acquire light and nutrients. However, the absolute light level and nutrient concentrations at the peak depths varied dramatically among neighboring stations, likely affected by physical movements.