Dissertation Research: Linking successional dynamics of bacterioplankton communities to biogeochemical processes at the landscape scale.

论文研究：将浮游细菌群落的演替动态与景观尺度的生物地球化学过程联系起来。

• 批准号: 0709975
• 负责人: John Melack
• 金额: $ 0.9万
• 依托单位: University of California-Santa Barbara
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-06-01 至 2009-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0709975&HistoricalAwards=false
• 关键词: Dissertation; Research; Linking; successional; dynamics

Recent advances in microbiology have underscored the dominant role of bacteria in regulating ecosystem processes. The research proposed here examines the relationship between bacterial diversity and ecosystem dynamics by determining experimentally how seasonal changes in bacterial communities in high-elevation lakes of the Sierra Nevada (California, USA) associate with changes in the composition and metabolism of dissolved organic matter. This study expands on previous dissertation work demonstrating predictable bacterial community changes in these environments and linking community shifts to snowmelt-driven changes in organic matter composition. Regional climate shifts are predicted to significantly affect snowmelt dynamics, and atmospheric deposition of nutrients in the western U.S. is leading to gradual eutrophication (excess nutrients) of montane lakes, many of which are located in protected areas. In collaboration with the National Park Service, the USDA-Forest Service, and the California Air Resources Board the results of this work will inform regional efforts to manage water quality and the maintenance of natural ecosystem function. Finally, by defining temporal dynamics of bacteria in the context of catchment organic matter supply & composition, seasonal lake transitions, and the character and rate of inflowing microbial communities, we aim to develop the first mechanistic illustration of bacterial changes linked to landscape-scale ecosystem processes.

微生物学的最新进展强调了细菌在调节生态系统过程中的主导作用。这里提出的研究通过实验确定内华达山脉(美国加利福尼亚州)高海拔湖泊中细菌群落的季节变化如何与溶解有机物的组成和新陈代谢的变化相关联，来检验细菌多样性和生态系统动力学之间的关系。这项研究是对以前论文工作的扩展，展示了这些环境中可预测的细菌群落变化，并将群落变化与融雪驱动的有机质组成变化联系起来。据预测，区域气候变化将显著影响融雪动态，美国西部大气中营养物质的沉积正导致山地湖泊逐渐富营养化(过量营养物质)，其中许多湖泊位于保护区。与国家公园管理局、美国农业部森林管理局和加州空气资源委员会合作，这项工作的结果将为区域管理水质和维护自然生态系统功能的努力提供参考。最后，通过在流域有机物质供应和组成、季节性湖泊过渡和流入微生物群落的特征和速率的背景下定义细菌的时间动态，我们的目标是发展第一个与景观尺度生态系统过程有关的细菌变化的机制说明。