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.

底栖生物消费者在控制河流系统中的浮游生物方面可以发挥重要作用。底栖生物损失的程度在很大程度上取决于与气候有关的因素，即温度和降雨量(水位)。浮游生物的生长和底栖生物造成的损失之间的不匹配可能会严重影响生态系统的功能。本文以莱茵河为模型系统，旨在提供一个数据来解释和预测底栖动物对不同浮游生物种群发育的影响，以应对气候条件的变化。在正常情况下，河流中底栖和中上层群落之间的营养相互作用比静止水中的要密切得多。将采用不同的方法，包括实地研究和关于海底-上层耦合的实验。实验将在不同的流道中进行，包括河流绕流系统，以评估温度变化条件下底栖关键物种和底栖群落对不同浮游生物群落的影响。将在实地调查潜在底栖生物消费者(特别是与生物膜相关的动物群)的空间和时间动态。此外，在长期采样活动的基础上，将继续分析重要浮游生物种群的动态，重点是气候变化对浮游生物组成的影响。如果海底-上层相互作用的匹配/错配发生重大变化，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将是分析可能的错配条件。与湖泊或海洋系统相比，全球气候变化通常预计河流系统将面临最大的环境变化。