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Size-dependent phytoplankton growth and grazing in the northern South China Sea

机译：南海北部依赖大小的浮游植物的生长和放牧

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摘要

Field surveys of the northern South China Sea (NSCS) were conducted during the summer of 2015 and 2016 with size-fractionated chlorophyll a (chl a) measurements and sizespecific dilution experiments for 3 phytoplankton size classes, including micro-(20 to 200 mu m), nano-(2 to 20 mu m), and picophytoplankton ( 2 mu m). Our results suggest that phytoplankton size structure and size-specific rates of growth and grazing mortality could vary substantially along the coastal, transition, and oceanic zones of the NSCS. There was an elevated microphytoplankton concentration in the inner shelf, in contrast to the dominance of nanophytoplankton over the middle and outer shelves. However, the phytoplankton community was mostly dominated by picocells in the oligotrophic oceanic regions. We found a nonlinear relationship between nanophytoplankton and total chl a, which is different from both pico-cells (a linear decrease) and micro-cells (a linear increase). By assessing the functional responses of the size-specific growth rates to nitrate concentrations, we found a higher nitrate-saturated maximal growth rate and a larger half-saturation constant for microphytoplankton, whereas nano-and picophytoplankton showed similar lower maximal rates and smaller half-saturation constants. There was also much higher grazing mortality of microphytoplankton in response to the increase in total chl a. These findings are important for understanding plankton dynamics and the associated biogeochemical fluxes in contrasting marine ecosystems, as well as for future size-structure modeling of the NSCS.
机译：在2015年和2016年夏季对南中国海北部（NSCS）进行了实地调查，对3种浮游植物大小类别（包括微米级（20至200微米））进行了大小分级的叶绿素a（chl a）测量和大小特异性稀释实验。 ），纳米级（2至20微米）和浮游植物（<2微米）。我们的结果表明，浮游植物的大小结构以及特定大小的生长率和放牧死亡率可能会沿NSCS的沿海，过渡带和海洋带变化很大。与中层和外层架子上的纳米浮游植物的优势相反，内层架子上的浮游植物的浓度升高。然而，在贫营养型海洋区域，浮游植物群落主要由微微小区控制。我们发现纳米浮游植物与总chl a之间存在非线性关系，这与微微小区（线性减少）和微细胞（线性增加）不同。通过评估尺寸特定生长速率对硝酸盐浓度的功能响应，我们发现微浮游植物具有较高的硝酸盐饱和最大生长速率和较大的半饱和常数，而纳米浮游植物和微浮游植物的最大饱和饱和度较低，半浮游生物较小饱和常数。随着总chl a的增加，浮游植物的放牧死亡率也更高。这些发现对于理解与海洋生态系统形成对比的浮游生物动力学及其相关的生物地球化学通量，以及对未来NSCS的大小结构建模都很重要。

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  • 来源
    《Marine ecology progress series》 |2018年第12期|35-47|共13页
  • 作者

    Dong Yuan; Li Qian P.; Liu Zijia; Wu Zhengchao; Zhou Weiwen;

  • 作者单位

    Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou 510301, Guangdong, Peoples R China;

    Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou 510301, Guangdong, Peoples R China;

    Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou 510301, Guangdong, Peoples R China;

    Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou 510301, Guangdong, Peoples R China;

    Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou 510301, Guangdong, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Size-fractionated chlorophyll; Size-specific phytoplankton growth; Microzooplankton grazing; South China Sea;

    机译：大小分级的叶绿素;大小特定的浮游植物生长;微带藻浮游植物;南海;

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