Collaborative Research: Linking iron and nitrogen sources in an oligotrophic coastal margin: Nitrogen fixation and the role of boundary fluxes
合作研究:连接寡营养海岸边缘的铁和氮源:固氮和边界通量的作用
基本信息
- 批准号:2341997
- 负责人:
- 金额:$ 83.86万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2023
- 资助国家:美国
- 起止时间:2023-06-01 至 2025-04-30
- 项目状态:未结题
- 来源:
- 关键词:
项目摘要
This project will investigate how groundwater discharge delivers important nutrients to the coastal ecosystems of the West Florida Shelf. Preliminary studies indicate that groundwater may supply both dissolved organic nitrogen (DON) and iron in this region. In coastal ecosystems like the West Florida Shelf that have very low nitrate and ammonium concentrations, DON is the main form of nitrogen available to organisms. Nitrogen cycling is strongly affected by iron availability because iron is essential for both photosynthesis and for nitrogen fixation. This study will investigate the sources and composition of DON and iron, and their influence on the coastal ecosystem. The team will sample offshore groundwater wells, river and estuarine waters, and conduct two expeditions across the West Florida Shelf in winter and summer. Investigators will participate in K-12 and outreach activities to increase awareness of the project and related science. The project will fund the work of six graduate and eight undergraduate students across five institutions, furthering NSF’s goals of education and training. Motivated by preliminary observations of unexplained, tightly-correlated DON and dissolved iron concentrations across the West Florida Shelf (WFS), the proposed work will quantify the flux and isotopic signatures of submarine groundwater discharge (SGD)-derived DON and iron to the WFS, and evaluate the bioavailability of this temporally-variable source using four seasonal near-shore campaigns sampling offshore groundwater wells, estuarine, and riverine endmembers and two cross-shelf cruises. The work will evaluate whether SGD stimulates nitrogen fixation on the WFS, and the potential for the stimulated nitrogen fixation to further modify the chemistry of DON and dissolved iron in the region. The cross-shelf cruises will investigate hypothesized periods of maximum SGD and Trichodesmium abundance (June), and reduced river discharge and SGD (February), thus comparing two distinct biogeochemical regimes. The concentrations and isotopic compositions of DON and dissolved iron, molecular composition of DON, and the concentration and composition of iron-binding ligands will be characterized. Nitrogen fixation rates and Trichodesmium spp. abundance and expression of iron stress genes will be measured. Fluxes of DON and iron from SGD and rivers will be quantified with radium isotope mass balances. The impacts of SGD on nitrogen fixation and DON/ligand production will be constrained with incubations of natural phytoplankton communities with submarine groundwater amendments. Two hypotheses will be tested: 1) SGD is the dominant source of bioavailable DON and dissolved iron on the WFS, and 2) SGD-alleviation of iron stress changes the dominant Trichodesmium species on the WFS, increases nitrogen fixation rates and modifies DON and iron composition. Overall, the work will establish connections between marine nitrogen and iron cycling and evaluate the potential for coastal inputs to modify water along the WFS before export to the Atlantic Ocean. This study will thus provide a framework to consider these boundary fluxes in oligotrophic coastal systems and the relative importance of rivers and SGD as sources of nitrogen and iron in other analogous locations, such as coastal systems in Australia, India, and Africa, where nitrogen fixation and SGD have also been documented.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.
该项目将调查地下水排放如何将重要的营养物质输送到西佛罗里达大陆架的沿海生态系统。初步研究表明,地下水可能同时提供溶解有机氮(DON)和铁。在像西佛罗里达大陆架这样的沿海生态系统中,硝酸盐和铵的浓度非常低,DON是生物体可利用的主要氮素形式。氮循环受到铁供应的强烈影响,因为铁对光合作用和固氮都是必不可少的。本研究将探讨DON和铁的来源、组成及其对海岸生态系统的影响。该团队将对近海地下水井、河流和河口水域进行采样,并在冬季和夏季进行两次横跨西佛罗里达大陆架的探险。调查人员将参加K-12和外联活动,以提高对该项目和相关科学的认识。该项目将资助五个机构的六名研究生和八名本科生的工作,促进NSF的教育和培训目标。在对西佛罗里达大陆架(WFS)上不明原因的、密切相关的DON和溶解铁浓度的初步观察的推动下,拟议的工作将量化海底地下水排放(SGD)衍生的DON和铁到WFS的通量和同位素特征,并使用四个季节性近岸活动采样近海地下水井、河口和河流端部以及两个跨陆架巡航来评估这一时间可变来源的生物有效性。这项工作将评估SGD是否刺激WFS上的固氮,以及刺激固氮进一步改变该地区DON和溶解铁的化学作用的可能性。跨陆架巡航将调查假设的SGD和Trichodesum丰度最大的时期(6月),以及河流流量和SGD减少的假想时期(2月),从而比较两种不同的生物地球化学制度。将表征DON和溶解铁的浓度和同位素组成,DON的分子组成,以及铁结合配体的浓度和组成。固氮率和毛霉菌。将测量铁胁迫基因的丰度和表达。来自SGD和河流的DON和铁的通量将使用镭同位素质量天平进行量化。SGD对固氮和DON/配体生产的影响将受到自然浮游植物群落的孵化和海底地下水改良剂的限制。将检验两个假说:1)SGD是WFS上生物有效DON和溶解铁的主要来源,2)SGD-缓解铁胁迫改变了WFS上优势的毛霉物种,增加了固氮率,改变了DON和铁的组成。总体而言,这项工作将建立海洋氮和铁循环之间的联系,并评估沿海投入物在出口到大西洋之前修改WFS沿线水的潜力。因此,这项研究将提供一个框架,以考虑贫营养化海岸系统中的这些边界通量,以及河流和SGD作为其他类似地点的氮和铁来源的相对重要性,例如澳大利亚、印度和非洲的沿海系统,在这些地方也记录了固氮和SGD。这一裁决反映了NSF的法定使命,并通过使用基金会的智力价值和更广泛的影响审查标准进行评估,被认为值得支持。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
数据更新时间:{{ journalArticles.updateTime }}
{{
item.title }}
{{ item.translation_title }}
- DOI:
{{ item.doi }} - 发表时间:
{{ item.publish_year }} - 期刊:
- 影响因子:{{ item.factor }}
- 作者:
{{ item.authors }} - 通讯作者:
{{ item.author }}
数据更新时间:{{ journalArticles.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ monograph.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ sciAawards.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ conferencePapers.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ patent.updateTime }}
Phoebe Chappell其他文献
Phoebe Chappell的其他文献
{{
item.title }}
{{ item.translation_title }}
- DOI:
{{ item.doi }} - 发表时间:
{{ item.publish_year }} - 期刊:
- 影响因子:{{ item.factor }}
- 作者:
{{ item.authors }} - 通讯作者:
{{ item.author }}
{{ truncateString('Phoebe Chappell', 18)}}的其他基金
COLLABORATIVE RESEARCH: Quantifying the effects of variable light and iron on the nitrate assimilation isotope effect of phytoplankton
合作研究:量化可变光和铁对浮游植物硝酸盐同化同位素效应的影响
- 批准号:
2333913 - 财政年份:2023
- 资助金额:
$ 83.86万 - 项目类别:
Standard Grant
Collaborative Research: Linking iron and nitrogen sources in an oligotrophic coastal margin: Nitrogen fixation and the role of boundary fluxes
合作研究:连接寡营养海岸边缘的铁和氮源:固氮和边界通量的作用
- 批准号:
2148812 - 财政年份:2022
- 资助金额:
$ 83.86万 - 项目类别:
Standard Grant
COLLABORATIVE RESEARCH: Quantifying the effects of variable light and iron on the nitrate assimilation isotope effect of phytoplankton
合作研究:量化可变光和铁对浮游植物硝酸盐同化同位素效应的影响
- 批准号:
1850925 - 财政年份:2019
- 资助金额:
$ 83.86万 - 项目类别:
Standard Grant
OCE-RIG: Developing Molecular Bioassays for Evaluating Iron Status of Environmentally Relevant Diatoms
OCE-RIG:开发评估环境相关硅藻铁状态的分子生物测定法
- 批准号:
1524482 - 财政年份:2015
- 资助金额:
$ 83.86万 - 项目类别:
Standard Grant
Collaborative Research: Investigating Iron-inding Ligands in Southern Ocean Diatom Communities: The Role of Diatom-Bacteria Associations
合作研究:调查南大洋硅藻群落中的铁配体:硅藻-细菌协会的作用
- 批准号:
1443646 - 财政年份:2015
- 资助金额:
$ 83.86万 - 项目类别:
Standard Grant
相似国自然基金
Research on Quantum Field Theory without a Lagrangian Description
- 批准号:24ZR1403900
- 批准年份:2024
- 资助金额:0.0 万元
- 项目类别:省市级项目
Cell Research
- 批准号:31224802
- 批准年份:2012
- 资助金额:24.0 万元
- 项目类别:专项基金项目
Cell Research
- 批准号:31024804
- 批准年份:2010
- 资助金额:24.0 万元
- 项目类别:专项基金项目
Cell Research (细胞研究)
- 批准号:30824808
- 批准年份:2008
- 资助金额:24.0 万元
- 项目类别:专项基金项目
Research on the Rapid Growth Mechanism of KDP Crystal
- 批准号:10774081
- 批准年份:2007
- 资助金额:45.0 万元
- 项目类别:面上项目
相似海外基金
Collaborative Research: Linking microbial social interactions within soil aggregate communities to ecosystem C, N, and P cycling
合作研究:将土壤团聚群落内的微生物社会相互作用与生态系统 C、N 和 P 循环联系起来
- 批准号:
2346372 - 财政年份:2024
- 资助金额:
$ 83.86万 - 项目类别:
Standard Grant
Collaborative Research: Linking carbon preferences and competition to predict and test patterns of functional diversity in soil microbial communities
合作研究:将碳偏好和竞争联系起来,预测和测试土壤微生物群落功能多样性的模式
- 批准号:
2312302 - 财政年份:2024
- 资助金额:
$ 83.86万 - 项目类别:
Standard Grant
Collaborative Research: Linking microbial social interactions within soil aggregate communities to ecosystem C, N, and P cycling
合作研究:将土壤团聚群落内的微生物社会相互作用与生态系统 C、N 和 P 循环联系起来
- 批准号:
2346371 - 财政年份:2024
- 资助金额:
$ 83.86万 - 项目类别:
Standard Grant
Collaborative Research: Elements: Linking geochemical proxy records to crustal stratigraphic context via community-interactive cyberinfrastructure
合作研究:要素:通过社区交互式网络基础设施将地球化学代理记录与地壳地层背景联系起来
- 批准号:
2311092 - 财政年份:2023
- 资助金额:
$ 83.86万 - 项目类别:
Standard Grant
Collaborative Research: IIBR: Innovation: Bioinformatics: Linking Chemical and Biological Space: Deep Learning and Experimentation for Property-Controlled Molecule Generation
合作研究:IIBR:创新:生物信息学:连接化学和生物空间:属性控制分子生成的深度学习和实验
- 批准号:
2318829 - 财政年份:2023
- 资助金额:
$ 83.86万 - 项目类别:
Continuing Grant
Collaborative Research: Bioarchaeology, Osteoimmunology, and Ecoimmunology: Linking Inflammation, Life History Tradeoffs, and Biocultural Change
合作研究:生物考古学、骨免疫学和生态免疫学:将炎症、生活史权衡和生物文化变革联系起来
- 批准号:
2316573 - 财政年份:2023
- 资助金额:
$ 83.86万 - 项目类别:
Standard Grant
Collaborative Research: CAS-Climate: Linking Activities, Expenditures and Energy Use into an Integrated Systems Model to Understand and Predict Energy Futures
合作研究:CAS-气候:将活动、支出和能源使用连接到集成系统模型中,以了解和预测能源未来
- 批准号:
2243099 - 财政年份:2023
- 资助金额:
$ 83.86万 - 项目类别:
Standard Grant
Collaborative Research: Linking iron and nitrogen sources in an oligotrophic coastal margin: Nitrogen fixation and the role of boundary fluxes
合作研究:连接寡营养海岸边缘的铁和氮源:固氮和边界通量的作用
- 批准号:
2422709 - 财政年份:2023
- 资助金额:
$ 83.86万 - 项目类别:
Standard Grant
Collaborative Research: Elements: Linking geochemical proxy records to crustal stratigraphic context via community-interactive cyberinfrastructure
合作研究:要素:通过社区交互式网络基础设施将地球化学代理记录与地壳地层背景联系起来
- 批准号:
2311091 - 财政年份:2023
- 资助金额:
$ 83.86万 - 项目类别:
Standard Grant
Collaborative Research: IRES Track 1: Transarctic Connections: Linking Alaskan Students with Finnish Arctic Scientists for Research in the Rapidly Changing Arctic
合作研究:IRES 第 1 轨道:跨北极联系:将阿拉斯加学生与芬兰北极科学家联系起来,研究快速变化的北极
- 批准号:
2246405 - 财政年份:2023
- 资助金额:
$ 83.86万 - 项目类别:
Standard Grant