Trait-related feedback dynamics in natural plankton communities

天然浮游生物群落中与性状相关的反馈动态

• 批准号: 394729143
• 负责人: Privatdozent Dr. Patrick Fink
• 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: 2017
• 资助国家: 德国
• 起止时间: 2016-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/394729143?language=en
• 关键词: Trait; related; feedback; dynamics; natural

Biodiversity loss is often accompanied by a loss of traits related to resource use and growth which are important for food web dynamics and trophic transfer efficiencies. In the DYNATLOSS II project, we specially focus on the feedback loop from reduced phytoplankton trait diversity to phytoplankton dynamics via diversity-mediated shifts in zooplankton. We will address this general objective with field experiments with natural plankton communities to estimate the direction and strength of total feedback effects. Additionally, we will analyse the individual components of the complex and multifactorial set of feedback effects (mainly by laboratory experiments). Our work programme will focus on the following main research question: Can altered grazing, due to shifts in phytoplankton diversity result in multiple (and partially interdependent) feedback effects? We will address this research question with a chain of testable hypotheses. Field experiments allow analysing total feedback effects under natural conditions. To disentangle individual feedback mechanisms such as linked to grazing dependent size distribution and nutrient availability, additional, highly controlled laboratory experiments will be performed.These feedback mechanisms may all affect the community of herbivorous zooplankton. This could potentially compensate short term effects of phytoplankton related shifts in zooplankton composition. In addition to the experimental approaches in laboratory and in the field, we will also model the proposed feedback effect using an extension of established nutrient dynamics models in phytoplankton – zooplankton systems.

生物多样性的丧失往往伴随着与资源利用和生长有关的性状的丧失，而这些性状对食物网动态和营养转移效率至关重要。在DYNATLOSS II项目中，我们特别关注通过浮游动物多样性介导的变化从浮游植物特征多样性减少到浮游植物动态的反馈回路。我们将解决这一总体目标与自然浮游生物群落的实地实验，以估计总的反馈效应的方向和强度。此外，我们将分析反馈效应的复杂和多因素集的各个组成部分（主要通过实验室实验）。我们的工作计划将集中在以下主要研究问题：改变放牧，由于浮游植物多样性的变化，结果在多个（和部分相互依存）的反馈效应？我们将用一系列可检验的假设来解决这个研究问题。田间试验允许在自然条件下分析总反馈效应。为了解开个体反馈机制，如与放牧依赖的大小分布和营养物质的可用性，额外的，高度控制的实验室实验将进行。这些反馈机制可能都会影响草食性浮游动物的群落。这可能会补偿浮游植物相关的浮游动物组成的变化的短期影响。除了在实验室和现场的实验方法，我们还将使用扩展的浮游植物-浮游动物系统中已建立的营养动力学模型来模拟所提出的反馈效应。