SGER: Distribution of Photoheterotrophic Bacteria in the Ocean

SGER：海洋中光合异养细菌的分布

• 批准号: 0225975
• 负责人: Michael Sieracki
• 金额: $ 2.57万
• 依托单位: Bigelow Laboratory for Ocean Sciences
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-05-15 至 2003-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0225975&HistoricalAwards=false
• 关键词: SGER; Distribution; Photoheterotrophic; Bacteria; Ocean

A new type of bacteria in the ocean was discovered this past year using in?situ infrared fluorescence measurements. These cells, termed aerobic, anoxygenic photoheterotrophs, or AAPs, are capable of using sunlight and/or carbon sources for energy. They can fix C02, but do not produce oxygen as traditional photosynthesizers do. They were shown to live in coastal ocean waters and in the Northeastern Pacific Ocean. The ecological role and importance of AAPs is not known. In current carbon models they are confounded with heterotrophic bacteria, yet may play a very different role. This project, a small grant for exploratory research, will analyze samples collected from 3 recent research cruises in the NW Atlantic for counts of AAP cells across seasons and across a trophic gradient from productive, coastal Maine, Gulf of Maine, and Georges Bank waters to offshore oligotrophic waters of the Sargasso Sea. This project will provide some of the first quantitative estimates of AAPs in different marine ecosystems and over different seasons, and will give the first indication of the potential ecological importance of this newly discovered microbial form. The findings from this study should have broad significance in understanding ocean ecology and biogeochemical cycling in the oceans.

去年，通过原位红外荧光测量发现了海洋中的一种新型细菌。 这些细胞被称为需氧、缺氧光合异养细胞或 AAP，能够利用阳光和/或碳源作为能量。它们可以固定二氧化碳，但不会像传统光合作用器那样产生氧气。它们被证明生活在沿海水域和东北太平洋。 AAP 的生态作用和重要性尚不清楚。在当前的碳模型中，它们与异养细菌混淆，但可能发挥非常不同的作用。该项目是一项用于探索性研究的小额资助，将分析最近在西北大西洋进行的 3 次研究航行中收集的样本，以了解跨季节和跨营养梯度的 AAP 细胞计数，从生产性沿海缅因州、缅因州湾和乔治浅滩水域到马尾藻海近海寡营养水域。 该项目将对不同海洋生态系统和不同季节的 AAP 进行一些首次定量估计，并将首次表明这种新发现的微生物形式的潜在生态重要性。 这项研究的结果对于理解海洋生态和海洋生物地球化学循环具有广泛的意义。