Molecular composition of Southern Ocean dissolved organic matter and its relation to structure and activity of prevailing microbial communities

南大洋溶解有机物的分子组成及其与主要微生物群落结构和活性的关系

• 批准号: 199760658
• 负责人: Dr. Jutta Niggemann
• 金额: --
• 依托单位: Institut für Chemie und Biologie des Meeres (ICBM)
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 财政年份: 2011
• 资助国家: 德国
• 起止时间: 2010-12-31 至 2017-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/199760658?language=en
• 关键词: Molecular; composition; Southern; Ocean; dissolved

Marine dissolved organic matter (DOM) contains two orders of magnitude more carbon than all living biomass in the ocean combined. Despite its importance for global element cycles, our understanding of sources and sinks, composition and dynamics of the DOM pool is still limited. DOM is the main carbon and energy source for heterotrophic marine microorganisms. Emerging analytical techniques provide molecular information on DOM and microbial communities in unsurpassed detail. We hypothesize that DOM molecular composition and the microbial community are closely interrelated and that the microbial imprint in DOM can be traced through the major deep water masses back to its main origin in the microbially most active surface layers. The Southern Ocean is characterized by close proximity of different water masses. Spatial and temporal variability of primary productivity render the system highly dynamic with respect to DOM composition and microbial community structure. Novel analytical techniques will provide us with a most detailed molecular fingerprint on both, DOM and the microbial community. Based on DOM molecular fingerprints we will define DOM regimes in the ocean. We hypothesize that the driving force behind these regimes are microbial acitivity and community composition. On a comprehensive molecular level, we will relate microbial processes to the cycling of specific DOM compounds. This will be a first step towards a systems biology approach in biogeochemistry.

海洋溶解有机物（DOM）所含的碳比海洋中所有生物量的总和还要多两个数量级。尽管它的重要性，全球元素周期，我们的理解源和汇，组成和动态的DOM池仍然是有限的。DOM是海洋异养微生物的主要碳源和能源。新兴的分析技术提供了关于DOM和微生物群落的分子信息，其细节无与伦比。我们假设，DOM的分子组成和微生物群落是密切相关的，DOM中的微生物印记可以追溯到主要的深水群众回到其主要来源的微生物最活跃的表层。南大洋的特点是不同的水团非常接近。初级生产力的空间和时间变异性，使系统高度动态的DOM组成和微生物群落结构。新的分析技术将为我们提供最详细的分子指纹，DOM和微生物群落。基于DOM分子指纹，我们将定义DOM在海洋中的制度。我们假设这些制度背后的驱动力是微生物活性和社区组成。在全面的分子水平上，我们将微生物过程与特定DOM化合物的循环联系起来。这将是迈向地球化学系统生物学方法的第一步。

项目成果

Bacterial community dynamics during polysaccharide degradation at contrasting sites in the Southern and Atlantic Oceans.

• DOI: 10.1111/1462-2920.12842
• 发表时间: 2015-10
• 期刊: Environmental microbiology
• 影响因子: 5.1
• 作者: Matthias Wietz;B. Wemheuer;H. Simon;Helge‐Ansgar Giebel;Maren Seibt;R. Daniel;T. Brinkhoff;M. Simon-M.