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.

是否由消费者（自上而下的监管）或资源的可用性（自下而上的法规）控制生产者多样性一直存在很长时间的辩论。直到最近，通过荟萃分析的现有研究的合成才提高了这两种因素在控制生产者多样性方面的相互作用。该项目调查了消费物种多样性对猎物社区物种多样性的作用。消费者对猎物多样性的影响不仅取决于消费者界的多样性，还取决于消费者的物种身份和饲料类型和其他环境因素。在受控的实验室条件下，使用外围设备作为资源群落和淡水底栖无脊椎动物（胃，等脚架，等脚底，三巨石，三氯翅目，trichoptera，ephemeroptera），将研究消费者与其他环境因素之间的这些潜在复杂的相互作用。此外，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，当时不同的猎物物种对消费者饮食的贡献不同（相对于重要的营养构成）。由于资源的营养质量通常决定食物网的营养转移效率，因此预计更多的潜水员捕食组合可以提高营养转移效率和消费者水平上的生产率。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，以及使用分子工具评估外围社区多样性的创新和新方法学方法。