Diffusion and Low Light Effects on the Nutrition and Growth of Large Marine Diatoms

扩散和弱光对大型海洋硅藻营养和生长的影响

• 批准号: 9416012
• 负责人: Joel Goldman
• 金额: $ 34.72万
• 依托单位: Woods Hole Oceanographic Institution
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-11-01 至 1998-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9416012&HistoricalAwards=false
• 关键词: Diffusion; Low; Light; Effects; Nutrition

9416012 Goldman PROJECT ABSTRACT The proposed research will investigate the importance of uncoupling photosynthetic carbon incorporation and nitrate uptake under low light conditions. Low light conditions are common at the base of the euphotic zone where episodic inputs of nutrients through mixing events might trigger the rapid growth of large diatoms. In addition, studies will be performed on the role that diffusion may play in the limitation of nitrate uptake and hence diatom growth. Those same experiments will also investigate the possibility that diatom growth might become limited by free CO2 as the pH rises and the total inorganic carbon pool shrinks. These studies will be performed in a series of controlled laboratory experiments involving isolates of large diatoms form the Sargasso Sea that are currently in culture in the Principal Investigator's laboratory. The results will provide a basis for assessing important aspects of the physiology of large phytoplankton species, their role in new production, and the potential impact of molecular diffusion in structuring the autotrophic portion of marine food chains.

小行星9416012 项目摘要 该研究将探讨弱光条件下光合碳结合和硝酸盐吸收解偶联的重要性。低光照条件下是常见的真光层的基础上，通过混合事件的营养物质的间歇输入可能会触发大型硅藻的快速增长。 此外，还将研究扩散在限制硝酸盐吸收和硅藻生长方面可能发挥的作用。 这些相同的实验还将研究硅藻生长可能会随着pH值的升高和总无机碳库的缩小而受到游离CO2的限制。 这些研究将在一系列受控实验室实验中进行，涉及目前在主要研究者实验室培养的来自马尾藻海的大型硅藻分离物。 研究结果将为评估大型浮游植物物种生理学的重要方面、它们在新生产中的作用以及分子扩散在构建海洋食物链的自养部分中的潜在影响提供基础。