Benthic Bacterial Processes: Fate of Organic Matter in the Greenland Sea

底栖细菌越来越被认为是最重要的 海底碳循环的组成部分，但对海底碳循环知之甚少。 极地海洋盆地的细菌活动。 德明提议 评价海底细菌的作用和海洋中有机物的归宿 动物丰富的格陵兰盆地和贫营养的挪威盆地。 要解决的具体问题包括：1）细菌生物量和 分布，并与相似深度的温带盆地进行比较; 2)不稳定溶解有机碳的使用率， 胞外酶水解更难降解的碳源，和 生长在零度以下的温度和高压这些 北极盆地; 3）沉积物有机碳的细菌利用 与底栖生物总需求量相比， 细菌对极地盆地和温暖地区碳循环的意义 盆地;和4）细菌群落结构的程度，零度以下 温度和压力的升高决定了细菌 极地盆地的活动。 结果将在 底栖生物碳利用总量的背景。 整体 结果将提供有关有机污染物命运的重要信息。 碳和新的见解的限制，温度和 高纬度深海细菌活动压力 环境.

Benthic bacteria are increasingly perceived as the most important component of benthic carbon cycles, yet little is known about benthic bacterial activity in polar marine basins. Deming proposes to evaluate benthic bacterial processes and fate of organic matter in the faunally rich Greenland Basin, and the oligotrophic Norwegian Basin. Specific topics to be addressed include: 1) bacterial biomass and distribution, and comparisons with temperate basins of similar depths; 2) rates of use for labile dissolved organic carbon, production of extracellular enzymes to hydrolize more refractory carbon sources, and growth at the sub-zero temperatues and elevated pressures of these arctic basins; 3) bacterial use of sediment organic carbon compared with total benthic demand, and comparison of benthic bacterial significance to carbon cycles in polar basins and in warmer basins; and 4) extent to which bacterial community structure, sub-zero temperatures, and elevated pressures determine rates of bacterial activity in polar basins. Results will be evaluated within the context of total benthic biological carbon utilization. Overall results will provide important information on the fate of organic carbon and new insight into the constraints that temperature and pressure place on bacterial activity in high-latitude and deep-sea environments.