The Biogeochemistry of Dissolved Iron-ligands in Marine Cyanobacteria and Seawater

海洋蓝藻和海水中溶解铁配体的生物地球化学

• 批准号: 1356747
• 负责人: Daniel Repeta
• 金额: $ 67.27万
• 依托单位: Woods Hole Oceanographic Institution
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-03-01 至 2018-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1356747&HistoricalAwards=false
• 关键词: Biogeochemistry; Dissolved; Iron; ligands; Marine

Micronutrient trace metals, such as iron and cobalt, are critical to all life on earth, and their availability in the environment can regulate the primary productivity in a region. In the ocean, up to 99.9% of dissolved iron, and to a lesser extent cobalt, are bound by strong organic binding molecules, known as ligands which control what fraction of these metals is available to organisms. To understand carbon and nutrient cycling in many remote areas of the ocean where trace metals limit primary production, it is important to understand the distribution and cycling of ligands. In this study, a researcher at the Woods Hole Oceanographic Institute will use novel techniques to assess the diversity and composition of natural iron and cobalt binding ligands in laboratory cultures of the globally abundant marine cyanobacteria Prochlorococcus and in seawater samples from the South Pacific Subtropical Gyre. This study will add significantly to the interpretation of iron and cobalt availability, and help to link measurements of elemental metal distributions, ligand concentrations and binding strengths, and assessments of the microbial community. Broader Impacts: Results from the project would be incorporated into graduate level organic geochemistry classes taught by the proponent and be made publically available through the Massachusetts Institute of Technology and Woods Hole Oceanographic Institution websites. One graduate student would be supported and trained as part of this project. It is anticipated that undergraduate students would also have the opportunity to participate in the study during the summer months and learn about organic geochemistry, microbial biogeochemistry, and modeling.

铁和钴等微量营养元素对地球上的所有生命都至关重要，它们在环境中的可用性可以调节一个地区的初级生产力。 在海洋中，高达99.9%的溶解铁和少量的钴被强有机结合分子结合，这些分子被称为配体，控制着这些金属中的哪一部分可供生物体使用。为了了解海洋中许多偏远地区的碳和营养物质循环，其中微量金属限制了初级生产，了解配体的分布和循环非常重要。在这项研究中，伍兹霍尔海洋研究所的一名研究人员将使用新技术来评估全球丰富的海洋蓝藻原绿球藻实验室培养物和南太平洋亚热带环流海水样本中天然铁和钴结合配体的多样性和组成。这项研究将大大增加铁和钴的可用性的解释，并有助于连接元素金属分布，配体浓度和结合强度的测量，以及微生物群落的评估。更广泛的影响：该项目的结果将纳入提议者教授的研究生有机地球化学课程，并通过马萨诸塞州理工学院和伍兹霍尔海洋研究所的网站提供。 作为该项目的一部分，将支助和培训一名研究生。 预计本科生也将有机会在夏季参加这项研究，了解有机地球化学，微生物地球化学和建模。