Collaborative Research: Shifting hotspots - How do consumer aggregations interact to influence resource heterogeneity and fluxes in streams?

协作研究：热点转移——消费者聚集如何相互作用来影响资源异质性和流中的通量？

• 批准号: 1457542
• 负责人: Caryn Vaughn
• 金额: $ 48.32万
• 依托单位: University of Oklahoma Norman Campus
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-04-01 至 2019-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1457542&HistoricalAwards=false
• 关键词: Collaborative; Research; Shifting; hotspots; How

This project will determine where and when short-lived fish and long-lived mussel communities overlap (biological hotspot) and how this overlap affects the amount and spread of nutrients in two rivers. Nutrients feed aquatic plants that support riverine food webs, and it is hypothesized that animal aggregations can influence nutrient pollution. Understanding how these types of biological hotspots interact will further our knowledge of river function and provide targets for river restoration. To understand the ecology of fish and mussel hotspots in rivers, the investigators will use complementary approaches including field monitoring, experiments, and mathematical modeling. In addition, the PIs will train a post-doctoral researcher and undergraduate and graduate students as well as organize outreach workshops for K-12 teachers to develop programs associated with water quality and ecosystem services.The ecological processes that occur at animal aggregations (biogeochemical hotspots) are important for ecosystem health and can help mitigate nutrient pollution. Animal aggregations create patches where processes such as energy transfer and nutrient recycling are higher than outside of patches. Long-lived freshwater mussels live buried in the sediment in localized patches that serve as stable, long-term biogeochemical hotspots. In contrast, where shorter-lived, fish occur depends on flow conditions in rivers. Fish aggregations serve as mobile, widespread, short-term biogeochemical hotspots. This project quantifies the spatial and temporal overlap and interactions between mussel and fish aggregations in rivers. A field study will quantify fish and mussel abundance under different flow conditions in two rivers to determine patch size and location. A correlative field study will quantify ecological services performed by mussel and fish aggregations under low and higher flow conditions. Mesocosm experiments will use chemical techniques to track the movement of nutrients from fish and mussel aggregates through the rest of the food web. Lastly, computer models of ecosystem dynamics will be used to scale from fish and mussel distribution and flow data generated in the small-scale field study up to the whole river scale. A workshop will train teachers in water quality activities they can use in their classrooms.

该项目将确定短寿命鱼类和长寿命贻贝群落在何处和何时重叠（生物热点），以及这种重叠如何影响两条河流中营养物质的数量和分布。营养物喂养支持河流食物网的水生植物，并且假设动物聚集可以影响营养物污染。了解这些类型的生物热点如何相互作用，将进一步加深我们对河流功能的认识，并为河流恢复提供目标。为了了解河流中鱼类和贻贝热点的生态学，研究人员将使用补充方法，包括现场监测，实验和数学建模。此外，PI还将培训博士后研究员、本科生和研究生，并为K-12教师组织外展研讨会，以开发与水质和生态系统服务相关的项目。发生在动物聚集区（生物地球化学热点）的生态过程对生态系统健康至关重要，有助于减轻营养物污染。动物聚集形成的斑块中，能量转移和营养循环等过程比斑块外的过程更高。长寿的淡水贻贝生活在沉积物中的局部斑块中，作为稳定的长期生物地球化学热点。相反，在寿命较短的地方，鱼类的出现取决于河流的水流条件。鱼群是移动的、广泛的、短期的生物地球化学热点。该项目量化了河流中贻贝和鱼类集群之间的时空重叠和相互作用。一项实地研究将量化两条河流不同水流条件下的鱼类和贻贝丰度，以确定斑块的大小和位置。相关的实地研究将量化贻贝和鱼类集群在低流量和高流量条件下的生态服务。围隔生态系统实验将使用化学技术来跟踪鱼类和贻贝聚集体中的营养物质通过食物网其余部分的移动。最后，生态系统动力学的计算机模型将被用来从小规模实地研究中产生的鱼类和贻贝分布和流量数据扩展到整个河流规模。一个讲习班将对教师进行水质活动培训，他们可以在课堂上使用。

项目成果

Freshwater mussels alter fish distributions through habitat modifications at fine spatial scales

• DOI: 10.1086/705666
• 发表时间: 2019-09
• 期刊: Freshwater Science
• 影响因子: 1.8
• 作者: Garrett W. Hopper;Traci P. Dubose;K. Gido;C. Vaughn

Biomass distribution of fishes and mussels mediates spatial and temporal heterogeneity in nutrient cycling in streams

鱼类和贻贝的生物量分布调节溪流养分循环的空间和时间异质性

• DOI: 10.1007/s00442-018-4277-1
• 发表时间: 2018
• 期刊: Oecologia
• 影响因子: 2.7
• 作者: Hopper, Garrett W.;Gido, Keith B.;Vaughn, Caryn C.;Parr, Thomas B.;Popejoy, Traci G.;Atkinson, Carla L.;Gates, Kiza K.
• 通讯作者: Gates, Kiza K.

Drought-Induced, Punctuated Loss of Freshwater Mussels Alters Ecosystem Function Across Temporal Scales

• DOI: 10.3389/fevo.2019.00274
• 发表时间: 2019-07-18
• 期刊: FRONTIERS IN ECOLOGY AND EVOLUTION
• 影响因子: 3
• 作者: DuBose, Traci P.;Atkinson, Carla L.;Golladay, Stephen W.
• 通讯作者: Golladay, Stephen W.