SIZE‐DEPENDENT PHOSPHORUS UPTAKE KINETICS AND CELL QUOTA IN PHYTOPLANKTON 1
SIZE‐DEPENDENT PHOSPHORUS UPTAKE KINETICS AND CELL QUOTA IN PHYTOPLANKTON 1
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DOI：
10.1111/j.1529-8817.1982.tb03184.x
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发表时间：
1982-06
影响因子：
2.9
通讯作者：
Ralph E. H. Smith;J. Kalff
中科院分区：
文献类型：
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作者：
Ralph E. H. Smith;J. Kalff
异速生长方程y = aXb，描述了浮游植物吸收磷动力学和细胞定额随细胞大小的种间变化，并表明小细胞吸收磷的速率比大细胞上级。在磷限制性湖泊的社区的磷缺乏培养物中通过径迹放射自显影进行的物种特异性测量显示，8种不同的物种在米氏半饱和常数Km方面没有显著差异。然而，饱和吸收速率（Vmax）和初始斜率的吸收曲线（Vmax：Km）每单位生物量减少细胞大小的增加。生物量特定的细胞磷配额也随着细胞体积的增加而下降，但不如Vmax或Vmax：Km那么快。来自文献的可比数据表明，海洋物种是上级的磷吸收淡水物种的大小相似，但异速生长的动力学变化似乎存在于两组。结合磷限制生长的可变内部储存模型，吸收动力学和配额的异速生长关系预测竞争有利于较小的细胞，随着竞争强度的增加，生长速率的差异逐渐减小。
The allometric equation, y = aXb, described the interspecific variation of phosphate uptake kinetics and cell quota with phytoplankton cell size and showed that smaller cells are superior in uptake rate to large. Species‐specific measurements, made by track autoradiography in phosphorus deficient cultures of communities from a phosphorus‐limited lake, revealed that eight different species did not differ significantly in the Michaelis‐Menten half‐saturation constant, Km. However, both saturated uptake rates (Vmax) and the initial slope of the uptake curve (Vmax:Km) decreased per unit biomass with increasing cell size. Biomass‐specific cell phosphorus quotas also decreased with increasing cell volume, but less rapidly than did Vmax or Vmax: Km. Comparable data from the literature showed that marine species were superior in phosphorus uptake to freshwater species of similar size, but allometric variation of kinetics appeared to exist within both groups. Together with a variable internal stores model of phosphorus‐limited growth, the allometric relationships of uptake kinetics and quotas predicted competition to favor smaller cells, with a differential in growth rate diminishing as competitive intensity increased.