Algal-bacterial interactions and aggregation: Implications for the plankton succession in neritic seas of the temperate zone in the course of climate change

可以预见的是，部分已经注意到，由于气候变化和温度升高，温带浅海地区浮游植物水华的发展经历了变化。这是真实的硅藻聚集在水华发展的过程中。与异养细菌的相互作用在聚集过程中起着重要的作用，最近已经发现。我们推测，随着温度的升高，特别是在春季聚集和随后的沉积将得到加强，使浮游动物可利用的资源减少。这一假设将测试与纯和非纯培养的四种硅藻，这将是接种细菌纯培养物和定义的混合培养物，并与北海浮游细菌。因此，将在滚动罐中生长的这些培养物中研究透明聚合物颗粒和溶解的有机材料的排泄及其细菌利用和聚集，作为4 ° C至20 °C之间的温度的函数。此外，北海天然浮游植物的聚集潜力将作为温度的函数进行评估。

It is to be expected and partially already noticeable that, due to climate change and increasing temperatures, the development of phytoplankton blooms in neritic regions of the temperate zone undergoes changes. This is true for aggregation of diatoms in the course of the bloom development. Interactions with heterotrophic bacteria play an important role in aggregation processes, as has been found most recently. We hypothesize that with increasing temperatures in particular in spring aggregation and subsequent sedimentation will be enhanced such that fewer resources are available to the Zooplankton. This hypothesis will be tested with axenic and non-axenic cultures of four diatoms, which will be inoculated with bacterial pure cultures and defined mixed cultures and with bacterioplankton of the North Sea. Therefore, the excretion of transparent expopolymer particles and of dissolved organic material and its bacterial utilization and aggregation will be investigated in these cultures growing in rolling tanks as a function of the temperature between 4 and 20 °C. Further the aggregation potential of natural North Sea phytoplankton will be assessed as a function of temperature.