Coupling mixing and photophysiological response of Antarctic plankton: a Lagrangian approach
Coupling mixing and photophysiological response of Antarctic plankton: a Lagrangian approach
复制标题
南极浮游生物的耦合混合和光生理响应：拉格朗日方法
作者：
D. Cianelli;Maurizio Ribera Dalcal;V. Saggiomo;E. Zambianchi
提出了一个基于个体的模型，该模型描述了浮游植物生长的空间和时间演变，该模型是由各种物理和生物强迫因子影响的细胞集合而言。细胞的运动是根据湍流速度场发展的，该速度场在夏季模拟了南极混合层。细胞的生长是辐照度状态，营养物的可用性和个体相对于其他细胞的垂直位置的函数（以评估自我阴影效果）。用于模拟生物体的光生理反应的光合参数的值是从罗斯海中收集的测量结果得出的。与以前的基于个体的描述相反，所有涉及的物理和生物过程都在其动力学特征中明确复制。将不同的混合水平与光绘制策略耦合，导致了广泛的光生理反应，这突显了个体生理历史在确定整个人群生长中的作用。模拟的光合参数，叶绿素A浓度和综合产生与原位数据密切相对应，并确认光含光辐照度和强烈的混合状态可能被认为是南极浮游植物光合作用的关键因素。
An individual-based model is presented which describes the spatial and temporal evolution of phytoplankton growth in terms of a Lagrangian ensemble of cells affected by various physical and biological forcing factors. The motion of cells develops according to a turbulent velocity field which simulates the Antarctic mixed layer during the summer. The cell growth is a function of the irradiance regime, nutrient availability and the vertical position of the individual with respect to the other cells (in order to evaluate the self-shading effect). The values of photosynthetic parameters used to simulate the photophysiological response of the organisms are derived from measurements collected in the Ross Sea. In contrast to previous individual-based descriptions, all the physical and biological processes involved are explicitly reproduced in their dynamical features. Coupling different mixing levels with photoacclimation strategies leads to a wide range of photophysiological responses which underline the role of individual physiological histories in determining the growth of the population as a whole. Simulated photosynthetic parameters, chlorophyll a concentrations and integrated primary production correspond closely to in situ data and confirm that photoacclimation to low irradiance and strong mixing regimes may be considered as crucial factors in the photosynthetic performance of Antarctic phytoplankton.