The use of large shipboard barrels and drifters to study the effects of coastal upwelling on phytoplankton dynamics1, 2
The use of large shipboard barrels and drifters to study the effects of coastal upwelling on phytoplankton dynamics1, 2
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DOI：
10.4319/lo.1987.32.2.0368
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发表时间：
1987-03
影响因子：
4.5
通讯作者：
F. Wilkerson;R. Dugdale
中科院分区：
文献类型：
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作者：
F. Wilkerson;R. Dugdale
在OPUS（持续上升流结构的组织）的上升流中心在点概念，加州，大型（380升）塑料船（桶）的研究进行了测试，作为实验工具，研究浮游植物的过程中隔离的变化循环和放牧。在上升流循环的不同阶段，桶中装满了来自上升流中心的水。上升流模拟在一个桶系列和浮游植物响应额外的营养物质和阴影进行了检查。15 N的吸收（VNO，-）和硝酸还原酶活性（VNR）的桶中的测量报告的背景下，“走廊带”的假设，其中涌上的藻类经历了一个“移位”的新陈代谢，然后由“移位”。结果表明，相同的趋势与拉格朗日采样沿着漂流者的轨迹开始在同一时间和地点的桶。我们的假设，即初始营养浓度有一个影响的速率上的移位（定义为加速的VNO，-或VNR）的速率，V/NO，-和VNR，和硝酸盐浓度的加速之间的正相关性得到证实。在秘鲁15'S的上升流中心，根据VNO、锥管和保持实验的加速度以及硅酸盐浓度进行了类似的观测。
During the OPUS (Organization of Persistent Upwelling Structures) study of the upwelling center at Point Conception, California, large (380 liter) plastic shipboard enclosures (barrels) were tested as experimental tools to study phytoplankton processes in isolation from variability in circulation and grazing. Barrels were filled with water from the upwelling center during different stages of the upwelling cycle. Upwelling was simulated in one barrel series and the phytoplankton response to additional nutrients and shading was examined. Measurements of 15N uptake (VNO,-) and nitrate reductase activity (VNR) made in the barrels are reported in the context of a “conveyor-belt” hypothesis in which upwelled algae go through a “shift-up” in metabolism followed by a “shiftdown.” The results showed the same trends as those obtained with Lagrangian sampling along drifter tracks initiated at the same time and place as the barrels. Our hypothesis that the initial nutrient concentration has an effect on the rate of shift-up (defined as acceleration of VNO,- or VNR) was substantiated by a positive correlation between acceleration of the rates, V/NO,- and VNR, and nitrate concentration. At the upwelling center at 15’S, Peru, a similar observation was based both on VNO,- acceleration from drogue and holdover experiments and on silicate concentration.