MICRO-CYCLE: Unravelling the role of microbial genomic traits in organic matter cycling and molecular composition along the river continuum

微循环：揭示微生物基因组特征在河流连续体有机物循环和分子组成中的作用

• 批准号: NE/Z000106/1
• 负责人: Penny Johnes
• 金额: $ 83.82万
• 依托单位: University of Bristol
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2024
• 资助国家: 英国
• 起止时间: 2024 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=NE%2FZ000106%2F1
• 关键词: MICRO; CYCLE; Unravelling; role; microbial

Global biogeochemical cycles describe the transformation and transport of carbon and other nutrients between the major components of the Earth system. Rivers and streams represent a major component in this cycle, linking flows of carbon (C), in the form of organic matter (OM), and other nutrients (nitrogen, N; phosphorus, P) between the terrestrial environment and the atmosphere and oceans. Bacteria in rivers and streams, which can number in the millions of cells and thousands of species per millilitre of water (called bacterioplankton), use OM and the carbon, nitrogen and phosphorus it contains, as a source of food, both for growth and for respiration. The OM pool contains a similarly diverse range of compounds, with tens of thousands of molecules, with varying C, N, P and other chemical constituents held in a wide variety of different chemical structures. Bacteria have preferences for different forms of OM, linked to these differing structures and contents, but we know little about which species of bacteria exploit which OM molecules. This is important, as the OM from terrestrial ecosystems is changed in both concentration and chemical structure during transport from the headwaters of a river to downstream reaches, estuaries and the sea. The interactions between the bacterial community and OM play a critical role in determining how much C, N and P are released into the oceans and how much is respired as carbon dioxide or released as nitrogen gas to the atmosphere.The MICRO-CYCLE project seeks to better understand the role that bacterioplankton play in using and modifying OM as they both flow from the headwaters of rivers towards the sea (called the 'river continuum'). This new knowledge of the ecological processes that determine what types of bacteria are present in rivers, how this varies from headwaters to the sea, and what this means for how OM is used and transported along rivers, will help us create models that can better predict how rivers function, as well as how they might change in future.We will do this by filling the gaps of knowledge in:1. The mechanisms by which bacterioplankton communities are structured across the river continuum, from headwaters to the lower reaches of rivers. This will be achieved by spatially structured sampling across the River Thames and its sub-catchments representing different landscape and hydrological characteristics.2. Which species of bacteria (the bacterial community) play an active role in using OM and which species are just 'passing through' and not contributing functionally to OM cycling (and how this varies along the river continuum in response to environmental fluctuations).3. The role that the chemical composition of OM has in determining the structure and function of the bacterial community along the river continuum, and the role that the bacterial community has in changing the chemical composition of OM.4. The ecological and functional structure of bacteria along the river continuum, and the relationships between bacterial communities and OM, to build predictive models of how bacteria control the metabolism of rivers and the export of C and N to the atmosphere and C, N and P to the oceans.

全球生物地球化学周期描述了地球系统主要组成部分之间碳和其他营养素的转化和运输。河流和溪流代表了此周期中的主要组成部分，以有机物（OM）的形式将碳（C）的流动连接起来，以及其他营养物质（氮，N;磷，P）之间的陆地环境，大气和大气和海洋。河流和溪流中的细菌可以在数百万个细胞和数千种水中数量的水（称为细菌泛素），使用OM和碳，氮和磷所包含的碳作为食物的来源，既可以生长又用于呼吸。 OM池含有类似多样的化合物，具有数以万计的分子，具有不同的C，N，P和其他化学成分，以及其他各种不同化学结构的成分。细菌对不同形式的OM具有偏好，与这些不同的结构和内容相关，但我们对哪种细菌的利用却一无所知。这很重要，因为从陆地生态系统中的OM从河流源头运输到下游到达下游，河口和海洋时，浓度和化学结构都会改变。 The interactions between the bacterial community and OM play a critical role in determining how much C, N and P are released into the oceans and how much is respired as carbon dioxide or released as nitrogen gas to the atmosphere.The MICRO-CYCLE project seeks to better understand the role that bacterioplankton play in using and modifying OM as they both flow from the headwaters of rivers towards the sea (called the 'river continuum').对确定河流中存在哪种细菌类型的生态过程的新知识，这是如何从源头流到海洋的情况的不同，以及这对沿河流的OM使用和运输意味着什么，将帮助我们创建能够更好地预测河流功能的模型，以及如何在未来的情况下进行变化。我们将通过填充知识的知识来实现​​：1：1：1：1。从源头到河流下部的河流，细菌群落群落构建的机制。这将通过在泰晤士河上及其代表不同景观和水文特征的子捕捉的空间结构化采样来实现。2。哪种细菌（细菌群落）在使用OM中起着积极的作用，哪种物种只是“通过”，而不是在功能上有助于OM循环（以及这如何沿着河流沿河的连续体变化，响应环境波动）。3。 OM的化学成分在确定河流连续河沿河中细菌群落的结构和功能以及细菌群落在改变OM.4的化学组成中的作用。沿河连续细菌的生态和功能结构，以及细菌群落与OM之间的关系，以建立细菌如何控制河流的代谢以及C和N向大气以及C，N和P向海洋中的C和N出口的预测模型。