Does the settling column method underestimate phytoplankton sinking speeds?

Does the settling column method underestimate phytoplankton sinking speeds?
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沉降柱方法是否低估了浮游植物的下沉速度?

DOI:
10.1098/rsos.231455
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发表时间:
2024
影响因子:
3.5
通讯作者:
Gemmell, Brad J.
Gemmell, Brad J.
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Du Clos, Kevin T.;Gemmell, Brad J.

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浮游植物下沉是海洋碳和营养盐垂直通量的主要组成部分,下沉是浮游植物生物学和生态学的组成部分。我们对浮游植物下沉的理解大部分来自沉降柱法(SETCOL),其中下沉速度是根据设定时间后到达充满水的柱底部的细胞比例计算的。基于视频的方法是SETCOL的最新替代方法,其中通过跟踪盐度分层水柱中单个细胞的运动来测量下沉速度。在这项研究中,我们提出了一个荟萃分析的结果表明,SETCOL产生显着和一贯较低的下沉速度比视频的方法。接下来,我们进行了粒子图像测速分析,这表明,所观察到的两种方法之间的下沉速度的差异可能可以解释由弱对流在SETCOL。最后,我们讨论了这些结果的影响,解释过去和未来的浮游植物下沉速度的测量和模型,依赖于这些测量。
Phytoplankton sinking is a major component of vertical ocean carbon and nutrient fluxes, and sinking is an integral component of phytoplankton biology and ecology. Much of our understanding of phytoplankton sinking derives from the settling column method (SETCOL) in which sinking speeds are calculated from the proportion of cells reaching the bottom of a water-filled column after a set time. Video-based methods are a recent alternative to SETCOL in which sinking speeds are measured by tracking the movement of individual cells in a salinity-stratified water column. In this study, we present the results of a meta-analysis showing that SETCOL produces significantly and consistently lower sinking speeds than the video method. Next, we perform a particle image velocimetry analysis, which shows that the observed discrepancy in sinking speeds between the two methods can probably be explained by weak convection currents in the SETCOLs. Finally, we discuss the implications of these results for the interpretation of past and future phytoplankton sinking speed measurements and models that rely on those measurements.
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