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Torn between extremes: the ups and downs of phytoplankton

机译：在极端之间挣扎：浮游植物的起伏

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摘要

We present a model to investigate the success and resulting patterns of phytoplankton migration, based on motility which depends exclusively on the internal energy and nutrient state of the cells. The model consists of migrating and non-migrating sub compartments for phytoplankton, and migration is a function of the prescribed threshold values for internal quotas. The different modes of phytoplankton behavior are evaluated in the framework of a coupled physical-biological model that includes wind-driven up- and downwelling. The results show that (1) migration is almost always advantageous with respect to biomass, (2) a wide variety of migration patterns (e.g., subsurface maxima, surface-avoidance behavior) can be reproduced by a relatively simple treatment of motility, (3) multiple deep chlorophyll maxima can be explained as the result of certain threshold values in combination with negligible vertical movement of the water, and (4) descending tongues of high phytoplankton concentration may be caused by migratory behavior and not necessarily by subduction due to frontal convergence. Thus, our model offers explanations for a large variety of observed phytoplankton distributions and migration patterns.
机译：我们提出了一个模型来研究浮游植物迁移的成功和产生的模式，该模型基于动力，而动力完全取决于细胞的内部能量和营养状态。该模型由浮游植物的迁移子隔室和非迁移子隔室组成，并且迁移是内部配额的规定阈值的函数。在包括风驱动的上升和下降流的耦合物理生物学模型的框架内，评估了浮游植物行为的不同模式。结果表明：（1）迁移相对于生物质几乎总是有利的；（2）可以通过相对简单的运动性处理来复制各种各样的迁移模式（例如，地下最大，避免表面行为）（3 ）多个深层叶绿素最大值可以解释为某些阈值加上水的垂直运动可忽略不计的结果，并且（4）浮游植物浓度高的下降舌头可能是由于迁徙行为引起的，而不一定是由于额叶汇聚所引起的俯冲作用。因此，我们的模型为观察到的多种浮游植物分布和迁移模式提供了解释。

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