Interactions between consumer and resource diversity under changing environmental conditions

不断变化的环境条件下消费者与资源多样性之间的相互作用

• 批准号: 211053252
• 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: Research Grants
• 财政年份: 2012
• 资助国家: 德国
• 起止时间: 2011-12-31 至 2015-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/211053252?language=en
• 关键词: Interactions; between; consumer; resource; diversity

There has been a long debate whether producer diversity is controlled by the presence of consumers (top-down regulation) or by the availability of resources (bottom-up regulation). Only recently, syntheses on existing studies via meta-analyses suggested an interaction of both these factors in regulating producer diversity. This project investigates the role of consumer species diversity on the species diversity of a prey community. The effects of the consumers on the prey diversity are expected to not only depend on the diversity of the consumer community, but also on the species identity and feeding type of the consumers and other environmental factors. These potentially complex interactions between consumers and other environmental factors on the prey community will be investigated under controlled laboratory conditions and in mesocosm and field experiments using periphyton as resource community and freshwater benthic invertebrates (gastropods, isopods, trichoptera, ephemeroptera) as consumers. Furthermore, the diversity of the prey community is hypothesized to have impacts on the nutritional quality of the (mixed) prey assemblage for the consumers when different prey species contribute differently (with respect to important nutritional constituents) to the consumers’ diet. Since the nutritional quality of the resource often determines the trophic transfer efficiency in food webs, it is expected that more diverse prey assemblages enhance the trophic transfer efficiency and the productivity on the consumer level. Hence, this project combines important and fundamental questions on the relations between biodiversity and ecosystem structure with the innovative and new methodological approach of using molecular tools for the assessment of periphyton community diversity.

生产者多样性是由消费者的存在(自上而下的监管)控制的，还是由资源的可获得性(自下而上的监管)控制的，这一争论由来已久。直到最近，通过荟萃分析对现有研究的综合表明，这两个因素在调节生产者多样性方面存在交互作用。这个项目调查了消费者物种多样性对猎物群落物种多样性的作用。消费者对猎物多样性的影响不仅取决于消费者群落的多样性，还取决于消费者的物种认同和取食类型等环境因素。消费者与猎物群落中其他环境因素之间的这些潜在的复杂相互作用将在受控的实验室条件下以及以附生植物为资源群落、淡水底栖无脊椎动物(腹足类、等足目、毛翅目、短翅目)为消费者的中观和野外实验中进行调查。此外，当不同的猎物种类对消费者的饮食有不同的贡献(关于重要的营养成分)时，假设猎物群落的多样性对消费者的(混合)猎物组合的营养质量产生影响。由于资源的营养质量往往决定食物网中的营养转移效率，预计更多样化的猎物组合将在消费者层面上提高营养转移效率和生产力。因此，该项目结合了关于生物多样性和生态系统结构之间关系的重要和基本问题，以及利用分子工具评估周围植物群落多样性的创新和新的方法。