Aquatic–terrestrial linkages: Export of polyunsaturated fatty acids from aquatic ecosystems via emerging insects and potential consequences for terrestrial invertebrate consumers

水生与陆地的联系：通过新兴昆虫从水生生态系统输出多不饱和脂肪酸以及对陆地无脊椎动物消费者的潜在后果

• 批准号: 403861694
• 负责人: Professor Dr. Dominik Martin-Creuzburg
• 金额: --
• 依托单位: Department für Weiterbildungsforschung und Bildungstechnologien
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2018
• 资助国家: 德国
• 起止时间: 2017-12-31 至 2021-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/403861694?language=en
• 关键词: Aquatic; terrestrial; linkages; Export; polyunsaturated

Cross-ecosystem fluxes of organic matter can crucially influence the productivity of adjacent habitats. Emerging aquatic insects provide an important pathway by which freshwater-derived organic matter can enter terrestrial food webs. Effects of reciprocal resource subsidies on adjacent food web processes depend on the quantity of the subsidy; if and how qualitative differences in resource subsidies can influence adjacent food web processes has not been studied yet. The objective of this project is to evaluate the transfer of essential and potentially limiting biochemical nutrients, i.e. polyunsaturated fatty acids (PUFA), from freshwater to terrestrial systems via emerging insects and to assess the significance of freshwater-derived PUFA for terrestrial invertebrate consumers. Emergence traps will be installed on different lake ecosystems to assess habitat-specific PUFA fluxes. Pond experiments with stable isotope-labelled substrates will be used to assess PUFA export via emerging insects and distribution of aquatic PUFA in adjacent terrestrial ecosystems and invertebrate consumers. Laboratory feeding experiments will be conducted with riparian invertebrate predators (i.e. spiders), aquatic and terrestrial insect prey and PUFA-manipulated food to test whether aquatic insects are preferentially consumed and support the growth of riparian predators more efficiently than terrestrial insect prey. This approach will provide novel insight into the potential role of essential nutrients in mediating cross-ecosystem effects.

有机物的跨生态系统通量对邻近生境的生产力有着至关重要的影响。新兴水生昆虫提供了一个重要的途径，淡水来源的有机物质可以进入陆地食物网。互惠资源补贴对相邻食物网过程的影响取决于补贴的数量;资源补贴的质的差异是否以及如何影响相邻食物网过程尚未研究。本项目的目标是评估通过新兴昆虫从淡水系统向陆地系统转移基本和潜在限制性生化营养物质，即多不饱和脂肪酸（PUFA），并评估淡水来源的PUFA对陆地无脊椎动物消费者的重要性。将在不同的湖泊生态系统上安装应急捕集器，以评估特定生境的PUFA通量。使用稳定同位素标记基质的池塘实验将用于评估PUFA通过新兴昆虫的输出以及水生PUFA在邻近陆地生态系统和无脊椎动物消费者中的分布。实验室饲养实验将与河岸无脊椎动物捕食者（即蜘蛛），水生和陆生昆虫猎物和多不饱和脂肪酸处理的食物进行，以测试水生昆虫是否优先消费，并支持河岸捕食者的生长比陆生昆虫猎物更有效。这种方法将提供新的洞察力的潜在作用的必需营养素介导的跨生态系统的影响。