CAREER: Beyond N and P: How trace metal limitation influences stream ecosystem function

职业：超越 N 和 P：痕量金属限制如何影响河流生态系统功能

• 批准号: 1943182
• 负责人: David Costello
• 金额: $ 71.8万
• 依托单位: Kent State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-09-01 至 2025-08-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1943182&HistoricalAwards=false
• 关键词: CAREER; Beyond; How; trace; metal

Algae covering the bed of stream ecosystems provide key food resources for invertebrates and fishes and can intercept pollutants. Algae grow rapidly when provided with light and a balanced supply of nutrients, and a lack of resources causes slow growth and inefficient filtering of pollutants. Algae require dozens of nutrients, but only two major nutrients (nitrogen and phosphorus) have been extensively studied in streams. Recent work in the ocean and large lakes has shown that trace metals are important for the growth of algae. This project will provide fundamental understanding of the role of trace metals in the growth of stream algae and explore the consequences of trace metal deficiencies on pollution filtering. This work will also provide experiences for high school and undergraduate students that promote key skills required of modern biology. Modern biology incorporates knowledge from many other scientific fields and this work’s study of trace metals provides an interdisciplinary approach that can be a model for developing scientists.This project will use experiments from the patch to stream scale to study the extent, cause, and consequences of trace metal deficiency for stream ecosystem structure and function. The project will answer three fundamental questions: (1) How often do trace metals influence algae growth in Great Lakes streams?, (2) How does changing the nutrient balance alter algal communities?, and (3) How does changing trace metal availability alter pollution filtering by algae? The study will use nutrient diffusing substrates (NDS) in 98 Great Lakes streams to identify locations and conditions where trace metals are influencing algae. Ensuing studies will measure algal communities and pollutant uptake rates under different trace metal conditions. Results at the patch scale will be confirmed at the whole stream scale with experiments in artificial channels and divided streams. The project will use NDS experiments in classrooms and laboratories to give high school and undergraduate students authentic research experiences. The researchers will work with the Kent State Upward Bound Math Science program to introduce high school students to interdisciplinary science and provide them with authentic, place-based research experiences in their local streams.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.

覆盖溪流生态系统床的藻类为无脊椎动物和鱼类提供了关键的食物资源，并可以拦截污染物。藻类在充满光和平衡的养分供应时迅速生长，缺乏资源会导致生长缓慢和污染物的效率低下。藻类需要数十种养分，但在溪流中只有两种主要营养素（氮和磷）被广泛研究。海洋和大湖区最近的工作表明，痕量金属对藻类的生长很重要。该项目将提供对痕量金属在流藻类生长中的作用的基本理解，并探讨痕量金属对污染过滤的后果。这项工作还将为高中和本科生提供经验，以促进现代生物学所需的关键技能。现代生物学结合了许多其他科学领域的知识，这项工作的痕量金属研究提供了一种跨学科的方法，可以成为发展科学家的模型。该项目将利用斑块的实验来研究流量表，以研究痕量金属缺乏症的程度，原因和后果，用于流生态系统结构和功能。该项目将回答三个基本问题：（1）痕量金属多久影响大湖溪流的藻类生长？该研究将在98个大湖泊中使用营养分化的底物（NDS）来识别痕量金属是影响藻类的位置和条件。随后的研究将在不同的痕量金属条件下测量藻类群落和污染物摄取率。通过在人造通道和分裂流中进行实验，将在整个流量表上确认斑块量表的结果。该项目将在教室和实验室中使用NDS实验，以提供高中和本科生的真实研究经验。研究人员将与肯特州立大学向上的数学科学计划合作，向高中生介绍跨学科科学，并在其本地流中为他们提供基于地点的基于地点的研究经验。这项奖项反映了NSF的法定任务，并被认为是值得通过基金会的知识分子优点和更广泛的影响审查标准来通过评估来通过评估来支持的。

项目成果

Trace metal–macronutrient colimitation of algal biofilms in streams with differing ambient inorganic nutrients

具有不同环境无机养分的溪流中藻类生物膜的痕量金属与常量养分共同限制

• DOI: 10.1086/726684
• 发表时间: 2023
• 期刊: Freshwater Science
• 影响因子: 1.8
• 作者: Fitzgibbon, Andrea S.;Costello, David M.
• 通讯作者: Costello, David M.