Researching the role of dissolved organic matter as a nutrient resource in freshwater ecosystems

研究溶解有机物作为淡水生态系统营养资源的作用

• 批准号: EP/Y033892/1
• 负责人: Penny Johnes
• 金额: $ 377.16万
• 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=EP%2FY033892%2F1
• 关键词: Researching; role; dissolved; organic; matter

Freshwaters are losing biodiversity at a higher rate than any other planetary domain. A wide range of stressors are driving this trend, of which climate change and increasing nutrient delivery from food production and consumption are ubiquitous. Research to date on nutrient enrichment impacts on freshwater biota has been limited by the physical challenge of experimentation in a rapidly changing environment, and a narrow perception of bioavailable nutrient forms. It has focused on species-specific responses to inorganic nutrient forms, often in vitro or in lakes, rarely for flowing waters under ambient conditions, and usually for microbial or planktonic organisms, ignoring the responses of other biotic groups, community level responses to enrichment, and the combined impacts of the range of bioavailable organic compounds in freshwaters. Transformational research is needed to update current nutrient cycling theory for stream ecosystems, shifting from research explaining how part of the ecosystem responds to a limited range of stressors, to fundamental, holistic theory explaining how whole ecosystems respond to a broad palette of stressors. I will lead a multidisciplinary team to tackle this challenge, applying innovative techniques in molecular scale analysis, stable isotope probing and environmental genomics, under field and climatically-altered conditions. We will then use new data-driven modelling to understand relationships between taxonomic and functional shifts in response to dissolved organic matter (DOM) and inorganic nutrient exposure, revealing environment x gene interactions in biotic responses to nutrient and climate stressors. This will advance current theory and transform our understanding of the impacts of the full nutrient portfolio on freshwater ecosystems, revealing the specific role of DOM as this varies according to the composition of the DOM pool, species composition of the ecosystem, stream stoichoimetry and environmental character.

淡水的生物多样性比任何其他行星领域都更高。广泛的压力源正在推动这种趋势，其中气候变化和粮食生产和消费量增加的营养递送无处不在。迄今为止，在迅速变化的环境中实验的物理挑战以及对生物利用营养形式的狭narly认知，迄今为止对淡水生物植物的养分影响的研究受到了限制。它专注于对无机养分形式的特定物种反应，通常在体外或湖泊中，很少在环境条件下流动水，通常用于微生物或浮游生物的生物体，忽略了其他生物群体的反应，社区水平的反应，对丰富的综合有机化有机化的有机化有机化的综合构成了新鲜的有机化层。需要转化研究以更新流媒体生态系统的当前营养自行车理论，从研究转移到解释一部分生态系统对有限压力源的反应，转变为基本的，整体理论，解释了整个生态系统如何对压力源的广泛调色板做出反应。我将领导一个多学科团队应对这一挑战，在分子尺度分析中应用创新技术，稳定的同位素探测和环境基因组学，在现场和气候变化的条件下。然后，我们将使用新的数据驱动建模来理解分类学和功能转移之间的关系，以响应溶解的有机物（DOM）和无机养分暴露，从而揭示了对养分和气候压力源的生物反应中的环境x基因相互作用。这将推动当前的理论，并改变我们对全部营养投资组合对淡水生态系统的影响的理解，从而揭示了DOM的特定作用，因为这种情况会根据DOM池的组成，生态系统的物种组成，流stoichoimetry和环境特征而变化。