Collaborative Research: Impact of the Amazon River Plume on nitrogen availability and planktonic food web dynamics in the Western Tropical North Atlantic

合作研究：亚马逊河羽流对西热带北大西洋氮可用性和浮游食物网动态的影响

• 批准号: 1737078
• 负责人: Joseph Montoya
• 金额: $ 53.62万
• 依托单位: Georgia Tech Research Corporation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2018
• 资助国家: 美国
• 起止时间: 2018-01-01 至 2023-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1737078&HistoricalAwards=false
• 关键词: Collaborative; Research; Impact; Amazon; River

This is a focused program of field research in waters of the Western Tropical North Atlantic influenced by the Amazon River Plume during the high river flow season. The Amazon Plume region supports diverse plankton communities in a dynamic system driven by nutrients supplied by transport from the river proper as well as nutrients entrained from offshore waters by physical mixing and upwelling. This creates strong interactions among physical, chemical, and biological processes across a range of spatial and temporal scales. The field program will link direct measurements of environmental properties with focused experimental studies of nutrient supply and nutrient limitation of phytoplankton, as well as the transfer of phytoplankton nitrogen to the zooplankton food web. The Amazon Plume exhibits a close juxtaposition of distinct communities during the high-flow season, making it an ideal site for evaluating how nutrient availability, nutrient supply, and habitat longevity interact to drive offshore ecosystem dynamics and function. This project will include German collaborators and will seamlessly integrate education and research efforts. The investigators and their institutions have a strong commitment to undergraduate and graduate education and to increasing the diversity of the ocean science community through active recruiting and training efforts. The team has a strong track record of involving both undergraduate and graduate students in their field and lab research. The two research cruises planned will provide opportunities for students and technicians to interact with an interdisciplinary and international research team. The ultimate objectives of this project are to understand the processes and interactions that promote distinct communities of nitrogen-fixing organisms (diazotrophs) and other phytoplankton around the Amazon Plume and to explore the impacts of these diazotroph-rich communities on zooplankton biomass and production. The research team includes scientists with expertise in nutrient and stable isotope biogeochemistry, remote sensing as well as specialists in characterizing water mass origin and history using naturally occurring radium isotopes. This combination of approaches will provide a unique opportunity to address fundamental questions related to plankton community structure, primary production, and links to secondary production in pelagic ecosystems. The project will address the following key questions focused on fundamental issues in plankton ecology resulting from previous research in this region:A. What mechanisms promote the preferential delivery of bioavailable phosphorus and the resulting strong nitrogen limitation associated with the northern reaches of the Amazon Plume during the high flow season? B. What factors lead to the clear niche separation between diazotrophs within and around the Amazon Plume and how are the distinct diazotroph communities influenced by hydrographic and biogeochemical controls associated with the Amazon River Plume and offshore upwelling processes? C. How does the nitrogen fixed by the different types of diazotrophs contribute to secondary production, and how efficiently does diazotroph nitrogen move through the food web?

这是一项针对西部热带北大西洋水域的现场研究计划，受到高河流流量季节的亚马逊河羽流的影响。亚马逊羽流地区在动态系统中支持各种浮游生物社区，该系统由从河流运输的营养物质以及通过物理混合和上升流提供的营养以及从近海水域侵入的营养物质提供的营养。这会在一系列空间和时间尺度上之间在物理，化学和生物学过程之间产生强烈的相互作用。现场计划将将环境特性的直接测量与浮游植物的养分供应和养分限制以及浮游植物氮的转移到浮游动物网络的转移。在高流量季节，亚马逊羽流与不同社区的密切并置，使其成为评估养分可用性，养分供应和栖息地寿命如何相互作用以推动离岸生态系统动态和功能的理想场所。该项目将包括德国合作者，并将无缝整合教育和研究工作。调查人员及其机构对本科和研究生教育有坚定的承诺，并通过积极招募和培训工作来增加海洋科学界的多样性。该团队有着良好的记录，即在他们的领域和实验室研究中涉及本科生和研究生。 计划的两项研究巡游将为学生和技术人员提供与跨学科和国际研究团队互动的机会。 该项目的最终目的是了解促进氮固定生物（重18zotrophs）和其他浮游植物围绕亚马逊羽流的不同社区的过程和相互作用，并探索这些富裕的富含重生杂质营养的群落对浮游动物生物群和生产的影响。研究团队包括具有营养和稳定同位素生物地球化学专业知识的科学家，遥感以及使用天然存在的镭同位素来表征水质量和历史的专家。这种方法的结合将为解决与浮游生物社区结构，初级生产以及与脑生态系统中的二级生产有关的基本问题提供独特的机会。该项目将解决以下关键问题，这些问题的重点是该地区先前研究引起的浮游生物生态学的基本问题：哪些机制促进了可生物利用磷的优先递送，以及在高流量季节期间与亚马逊羽流的北部到达相关的强氮限制？ B.哪些因素导致亚马逊羽毛和周围周围和周围周围的重18zotrophs之间存在明显的利基分离，以及如何受到与亚马逊河羽流和近海上流过程相关的水文和生物地球化学控制的不同重18zotroph社区？ C.不同类型的重18zotrophs固定的氮如何有助于二级生产，以及重18zozotroph氮在食物网中的有效性如何？

项目成果

Habitat Delineation in Highly Variable Marine Environments

高度变化的海洋环境中的栖息地划分

• DOI: 10.3389/fmars.2019.00112
• 发表时间: 2019
• 期刊: Frontiers in Marine Science
• 影响因子: 3.7
• 作者: Subramaniam;Montoya;Doan-Nhu;Nguyen-Ngoc;Dippner
• 通讯作者: Dippner

Planktonic habitats in the Amazon Plume region of the Western Tropical North Atlantic

• DOI: 10.3389/fmars.2024.1287497
• 发表时间: 2024-01-29
• 期刊: FRONTIERS IN MARINE SCIENCE
• 影响因子: 3.7
• 作者: Pham，Anh H.;Choisnard，Noemie;Montoya，Joseph P.
• 通讯作者: Montoya，Joseph P.

Mercury methylation linked to nitrification in the tropical North Atlantic Ocean

• DOI: 10.1016/j.marchem.2022.104174
• 发表时间: 2022-12
• 期刊: Marine Chemistry
• 影响因子: 3
• 作者: L. Starr;M. J. McCarthy;C. R. Hammerschmidt;A. Subramaniam;Marissa C. Despins;J. Montoya;Silvia E. Newell

The great Atlantic Sargassum belt

• DOI: 10.1126/science.aaw7912
• 发表时间: 2019-07-05
• 期刊: SCIENCE
• 影响因子: 56.9
• 作者: Wang, Mengqiu;Hu, Chuanmin;Montoya, Joseph P.
• 通讯作者: Montoya, Joseph P.

Copepods key traits in diverse habitats of tropical waters

热带水域不同栖息地的桡足类关键特征

• DOI: 10.1093/plankt/fbab088
• 发表时间: 2022
• 期刊: Journal of Plankton Research
• 影响因子: 2.1
• 作者: Doan-Nhu, Hai;Nguyen, Tam-Vinh;Do-Huu, Hoang;Montoya, Joseph P;Nguyen-Ngoc, Lam
• 通讯作者: Nguyen-Ngoc, Lam