Impact of climate variability on the bentho-pelagic coupling in a large river

气候变化对大河底栖-中上层耦合的影响

• 批准号: 5429964
• 负责人: Professor Dr. Markus Weitere
• 金额: --
• 依托单位: Department Fließgewässerökologie
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2004
• 资助国家: 德国
• 起止时间: 2003-12-31 至 2010-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5429964?language=en
• 关键词: Impact; climate; variability; bentho; pelagic

Benthic consumers can play an important role in controlling plankton in river systems. The degree of the loss to the benthos is strongly dependent on climate related factors, i.e. temperature and rain fall (water level). Mismatches in the balance between the growth of planktonic organisms and their loss induced by the benthos might strongly influence the ecosystem function. Here we aim to provide a data to explain and predict the benthic impact on the development of different plankton groups in response to changing climate conditions using River Rhine as a model system. Under normal conditions the trophic interactions between benthic and pelagic communities in rivers are much closer than in standing waters. Different approaches including field studies as well as experiments on the bentho-pelagic coupling will be applied. The experiments will be conducted in different flow channels including river bypass systems in order to estimate the impact of benthic key species and benthic communities on the different plankton groups under changing temperature condition. The spatial and temporal dynamics of potential benthic consumers (especially among the biofilm-associated fauna) will be investigated in the field. In addition, based on a long term sampling campaign, the analysis of the dynamics of significant plankton groups will be continued with focus on the impact of climate variations on the plankton composition. If there are significant changes in the matches/mismatches of bentho-pelagic interactions this would have tremendous influences on the functioning of river systems (degradation of organic compounds, etc.). The major aim of our study will be the analysis of conditions for possible mismatches. River systems are generally expected to face the greatest environmental changes with global climatic changes compared to lake or marine systems.

底栖消费者可以在控制河流系统中的浮游生物中发挥重要作用。对底栖生物的损失程度在很大程度上取决于气候相关因素，即温度和降雨降低（水位）。浮游生物的生长与底栖动物造成的损失之间的平衡不匹配可能会对生态系统功能产生强烈影响。在这里，我们旨在提供一个数据，以解释和预测底栖对不同浮游生物组的发展的影响，以响应使用河流作为模型系统的气候条件的变化。在正常条件下，河流中底栖和骨髓群落之间的营养相互作用要比站立水域更近。将采用不同的方法，包括现场研究以及实验脊椎联耦合。这些实验将在包括河流旁路系统在内的不同流动通道中进行，以估算底栖钥匙物种和底栖群落对不同温度条件下不同浮游生物组的影响。潜在的底栖消费者（尤其是在生物膜相关的动物区系中）的空间和时间动态将在该领域进行研究。此外，基于长期抽样运动，将继续对浮游生物组的动态进行分析，重点关注气候变化对浮游生物组成的影响。如果脊柱临床相互作用的匹配/不匹配存在重大变化，这将对河流系统的功能（有机化合物的降解等）产生巨大影响。我们研究的主要目的是分析可能的不匹配条件。通常，与湖泊或海洋系统相比，随着全球气候变化，河流系统通常会面临最大的环境变化。