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Maximal sustainable sinking velocity of phytoplankton

机译:浮游植物的最大持续下沉速度

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Most phytoplankton species have a tendency to sink. Phytoplankton require light for photosynthesis, however. Therefore, phytoplankton species that sink too fast will not be able to sustain a viable population in the euphotic zone. This points to the existence of a maximal sustainable phytoplankton sinking velocity. Using a reaction-advection-diffusion model of phytoplankton growth in a stratified water column, we derive that this maximal sinking velocity is inversely proportional to the turbidity of the water column. In other words, clear waters can sustain species with high sinking rates, whereas turbid waters can sustain species with low sinking rates only. We show that this prediction is both qualitatively and quantitatively supported by empirical data. An intriguing implication is that export production of sinking phytoplankton might be sensitive to the turbidity of the water column.
机译:大多数浮游植物都有沉没的趋势。浮游植物需要光才能进行光合作用。因此,沉没速度过快的浮游植物将无法在富营养区维持生存种群。这表明存在最大的可持续浮游植物沉没速度。使用分层水柱中浮游植物生长的反应-对流-扩散模型,我们得出此最大下沉速度与水柱的浊度成反比。换句话说,清澈的水可以维持高下沉率的物种,而混浊的水只能维持低下沉率的物种。我们表明,这一预测得到了经验数据的定性和定量支持。一个有趣的含义是沉没性浮游植物的出口生产可能对水柱的浊度敏感。

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