Phytoplankton Retention Mechanisms in Estuaries: A Case Study of the Elbe Estuary

This repository contains the <strong>model configuration and output</strong> for the publication:

<strong>Phytoplankton Retention Mechanisms in Estuaries: A Case Study of the Elbe Estuary.</strong>

Due to their role as primary producers, phytoplankton is essential for the proliferation of estuarine ecosystems. However, as small drifting organisms, phytoplankton cannot resist currents. Estuaries not only represent challenging habitats due to a strong salinity gradient, but also have net transport into oceans. So far, little is known about how phytoplankton retain themselves in estuaries. We present a new individual-based Lagrangian model of the Elbe estuary examining possible retention mechanisms of phytoplankton. In more detail, we investigated how reproduction, sinking and rising, as well as diel vertical migration might allow for population survival. We find that rising favors the retention success, fast sinking cause the opposite. We further provide first estimates on outwashing losses. Our simulations illustrate that shallow stretches of water along the river banks are essential for the long-term survival of phytoplankton populations. These results give important indications for ecosystem-based management of estuaries.

本仓库收录了对应发表论文的**模型配置与输出结果**，论文标题为：《河口浮游植物滞留机制：以易北河口（Elbe Estuary）为例》。

浮游植物作为初级生产者，对河口生态系统的繁衍存续至关重要。但作为小型漂流生物，浮游植物无法抵御洋流作用。河口不仅因强烈的盐度梯度成为极具挑战性的生境，还存在向海洋的净物质输送。目前学界对浮游植物如何在河口环境中实现自身滞留仍知之甚少。

本研究构建了一款针对易北河口的全新基于个体的拉格朗日模型（individual-based Lagrangian model），用以探究浮游植物的潜在滞留机制。具体而言，我们考察了繁殖、沉降与上浮，以及昼夜垂直迁移（diel vertical migration）如何助力种群存活。研究发现，上浮有利于提升滞留成功率，而快速沉降则会产生相反效果。本研究还首次估算了浮游植物的冲刷流失量。模拟结果表明，沿河岸分布的浅水区对浮游植物种群的长期存活至关重要。上述研究结果为河口的基于生态系统的管理提供了重要参考依据。