Sinking in freshwater phytoplankton: Some ecological implications of cell nutrient status and physical mixing processes1
Sinking in freshwater phytoplankton: Some ecological implications of cell nutrient status and physical mixing processes1
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DOI：
10.4319/lo.1976.21.3.0409
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发表时间：
1976-05
影响因子：
4.5
通讯作者：
D. Titman;P. Kilham
中科院分区：
文献类型：
--
作者：
D. Titman;P. Kilham
报道了台湾星形虫、黑穗虫、绿环虫和四角蝇在生长平稳期和指数期的下沉速率。平均而言，稳定期种群比指数增长种群下降快4~。从一个生长阶段到另一个生长阶段变化的下沉速率时间序列证明了快速下沉细胞的生存能力。Langmuir环流中沉降的考虑表明，经常使用的沉降速率与混合层细胞损失率之间的代数关系可能会大大高估损失率。一个理论的净潜在生长曲线，结合了下沉的损失和下沉相关的营养吸收的生长，表明营养耗尽的细胞在高下沉速率下可能具有最佳生长速率（最高适应性）。
Sinking rates of Asterionellu formosa, Melosira agassixii, Cyclotella meneghiniana, and Scenedesmus quadricauda in stationary and exponential phases of growth arc rcportcd. Stationary phase populations sink 4~ more rapidly, on the average, than exponentially growing populations. Time series of sinking rates during change from one growth phase to another demonstrate the viability of rapidly sinking cells. A consideration of sinking in Langmuir circulations indicates that the frcqucntly used algebraic relationship between sinking rate and rate of loss of cells from the mixed layer may greatly ovcrcstimatc loss rates. A theoretical net potential growth curve, that combines both loss from sinking and growth from sinking-dcpcndent nutrient uptake, demonstrates that nutrient depleted cells may have optimal growth rates (highest fitness) at high sinking rates.