Collaborative Research: Microbial and Geochemical Controls on Metal Cycling in Lake Vanda

合作研究：万代湖金属循环的微生物和地球化学控制

• 批准号: 9319708
• 负责人: Thomas Schmidt
• 金额: $ 18.6万
• 依托单位: Michigan State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-06-01 至 1998-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9319708&HistoricalAwards=false
• 关键词: Collaborative; Research; Microbial; Geochemical; Controls

9319708 Schmidt Lake Vanda is an ice-covered, permanently stratified lake. The water column, 69-meter deep, presents a wide range of geochemical and microbiological environments. The lake's 1200-year stratification history and its water column stability make it a model system for exploring the relationship between chemical processes and microbial diversity and activity. Of special interest is the relationship between successive reductive and oxidative zones and the microbial and chemical characteristics of those zones. Dr. Green and colleague plan the first simultaneous study of chemical and microbial community structure using a combination of measurements, including determinations of microbial biomass and diversity as estimated by microscopy and nucleic acid extraction and identification. Central to this work is the role played by manganese-reducing organisms in metal cycling in the Vanda water column. The capacity for microbially mediated manganese cycling will be assessed by determining the abundance of manganese reducers and the mechanisms involved in Mn reduction. In addition, a detailed study of metal transport mechanisms is planned along the 27-km course of the Onyx River, the lake's sole inflow. Determination of metal loadings and residences times in the lake will be made. ***

9319708施密特万达湖是一个冰封的，永久分层的湖泊。 的 69米深的水柱呈现出广泛的地球化学和微生物环境。 该湖1200年的分层历史及其水柱稳定性使其成为探索化学过程与微生物多样性和活性之间关系的模型系统。 特别令人感兴趣的是连续的还原区和氧化区与这些区域的微生物和化学特征之间的关系。 绿色博士和同事计划使用测量组合首次同时研究化学和微生物群落结构，包括通过显微镜和核酸提取和鉴定估计的微生物生物量和多样性的测定。 这项工作的核心是锰还原生物在万代水柱中金属循环中所起的作用。 微生物介导的锰循环的能力将通过确定锰还原剂的丰度和锰还原所涉及的机制来评估。此外，还计划沿着27公里长的玛瑙河（该湖唯一的流入河流）对金属运输机制进行详细研究。将确定湖中的金属负荷和停留时间。 ***