A model for variable phytoplankton stoichiometry based on cell protein regulation
A model for variable phytoplankton stoichiometry based on cell protein regulation
复制标题
DOI：
10.5194/bg-10-4341-2013
复制
发表时间：
2013-01-01
期刊：
影响因子：
4.9
通讯作者：
Levin, S. A.
中科院分区：
文献类型：
--
作者：
Bonachela, J. A.;Allison, S. D.;Levin, S. A.
海洋浮游植物的元素比率来自海洋生物和非生物成分之间复杂的相互作用，反映了个体对环境变化的可塑性反应。因此，浮游植物的化学计量是动态的，取决于细胞的生理状态。我们提出了一个理论模型的碳，氮和磷含量的浮游植物种群的动态。通过代表控制营养吸收的调节过程，并专注于营养含量和蛋白质合成之间的关系，我们的模型定性地复制现有的实验观察营养含量和比例。我们的模型所描述的人口采取的比例，匹配的输入比例为广泛的生长条件的营养。此外，还有两个单一营养限制区，中间被一个广泛的共同限制区隔开。在共同限制区内，可以确定以最佳比例提供营养的单一点。当不同物种竞争时，广泛的共同限制区的存在意味着与以前的模型预测相比更复杂的共存和排斥模式。然而，还需要更多的综合实验室实验来验证我们的预测。我们的模型有助于理解海洋氮和磷的全球循环，以及浮游植物种群中这些营养素的元素比例。
The elemental ratios of marine phytoplankton emerge from complex interactions between the biotic and abiotic components of the ocean, and reflect the plastic response of individuals to changes in their environment. The stoichiometry of phytoplankton is, thus, dynamic and dependent on the physiological state of the cell. We present a theoretical model for the dynamics of the carbon, nitrogen and phosphorus contents of a phytoplankton population. By representing the regulatory processes controlling nutrient uptake, and focusing on the relation between nutrient content and protein synthesis, our model qualitatively replicates existing experimental observations for nutrient content and ratios. The population described by our model takes up nutrients in proportions that match the input ratios for a broad range of growth conditions. In addition, there are two zones of single-nutrient limitation separated by a wide zone of co-limitation. Within the co-limitation zone, a single point can be identified where nutrients are supplied in an optimal ratio. When different species compete, the existence of a wide co-limitation zone implies a more complex pattern of coexistence and exclusion compared to previous model predictions. However, additional comprehensive laboratory experiments are needed to test our predictions. Our model contributes to the understanding of the global cycles of oceanic nitrogen and phosphorus, as well as the elemental ratios of these nutrients in phytoplankton populations.