Carbon isotopic heterogeneity in modern bacterioplankton: Model systems for understanding paleoenvironmental signatures.

现代浮游细菌中的碳同位素异质性：用于理解古环境特征的模型系统。

• 批准号: 0927290
• 负责人: Ann Pearson
• 金额: $ 51.62万
• 依托单位: Harvard University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-08-01 至 2012-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0927290&HistoricalAwards=false
• 关键词: Carbon; isotopic; heterogeneity; modern; bacterioplankton

This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5).Through research in the past two decades, the science community has seen a revolution in the understanding of marine microbial diversity. Molecular sequencing has revealed several previously unknown major groups of Bacteria and Archaea, yet total marine microbial diversity exceeds current species estimates. Preliminary research from Harvard University shows a systematic difference in the carbon isotope signature between bacterioplankton and eukaryote plankton, such that modern bacterioplankton show evidence of a carbon isotope shift. By sampling bacterioplankton from diverse regions of the surface ocean, researchers from Harvard University will examine patterns of carbon isotope distribution in marine surface bacterioplankton to identify the metabolic differences among microbial communities of various surface water types. Results from this research will enhance the current understanding of upper ocean carbon recycling and the action of the biological pump. In addition this research may identify and refine potential differences between export of microbial biomass in oligotrophic open ocean environments and organic-rich continental margin environments. This information could allow for scientist to understand the implications of past and future warm climates on marine microbial diversity. This research will provide support for a postdoctoral researcher, as well as two graduate students. The PIs involved in this project will also utilize the results to host a community outreach event in collaboration with the Harvard University Microbial Sciences Initiative.

该奖项是根据2009年的《美国复苏与再投资法》（公法111-5）资助的。在过去的二十年中，科学界在理解海洋微生物多样性方面发生了一场革命。分子测序揭示了几个以前未知的主要细菌和古细菌群，但总海洋微生物多样性超过了当前物种的估计。 哈佛大学的初步研究表明，细菌和真核生物浮游生物之间的碳同位素特征有系统的差异，因此现代的细菌浮游生物显示了碳同位素转移的证据。 通过对来自地表海洋不同地区的细菌浮游生物进行取样，哈佛大学的研究人员将检查海洋表面细菌中碳同位素分布的模式，以确定各种地表水类型的微生物群落之间的代谢差异。这项研究的结果将增强对上海洋碳回收的当前理解和生物泵的作用。 此外，这项研究可能会确定和完善微生物生物量在少亲营开放海洋环境中的出口和有机富的大陆边缘环境之间的潜在差异。 这些信息可以使科学家了解过去和未来温暖气候对海洋微生物多样性的影响。这项研究将为博士后研究人员以及两名研究生提供支持。参与该项目的PI还将利用结果与哈佛大学微生物科学计划合作举办社区外展活动。