The Effects of Mesoscale Eddies on Phytoplankton Community Structure, Total Production, and the F-Ratio in Open-Ocean Waters

中尺度涡流对公海水域浮游植物群落结构、总产量和 F 比的影响

• 批准号: 8800033
• 负责人: Edward Laws
• 金额: $ 6万
• 依托单位: University of Hawaii
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-05-01 至 1989-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8800033&HistoricalAwards=false
• 关键词: Effects; Mesoscale; Eddies; Phytoplankton; Community

Mesoscale Cyclonic Eddies Formed Near the Hawaiian Islands will be utilized to study the effects of upwelling events on the productivity, composition, biomass, and physiology of open-ocean phytoplankton populations. Recent technical and methodological advances will be utilized to more accurately determine the ratio of new production to total production (f-ratio) and the temporal and spatial variability of that ratio in the open ocean. Both simple empirical models and more sophisticated compartmental models will be tested for their ability to describe and explain observed f-ratio variations. Estimates of new production will be obtained using a recently developed nitrate analysis method with a precision of +/- 2nM. Total production will be estimated from the incorporation of C-14 labeled inorganic carbon into protein. This experimental approach will eliminate many of the potential artifacts and problems associated with traditional f-ratio studies, including perturbations caused by the addition of non- tracer amounts of N-15, isotope dilution of the substrate pool, difficulty in measuring ambient substrate concentrations, the need to measure uptake of at least three forms of dissolved N, and the fact that bacteria may account for a significant fraction of the uptake of ammonium. The biological productivity of the ocean varies geographically to a great degree. In mid-basin subtropical areas such as thevicinity of the Hawaiian Islands, production is typically relatively low. However, physical features of the local waters such as the circular eddies found to the west of the islands can enhance productivity by increasing the supply of nutrients for plant growth to surface waters. Laws and Bienfang will use state of the art techniques to measure these variations in biological production and relate it to the structure of the planktonic community. They will make sensitive measurements of new production, a parameter that is critical in estimating the flux of organic material from surface waters and its availability for harvestable resources. Conducting the studies in an area where oceanic eddies are found will provide a wide range of biological oceanographic conditions likely to be found in the open ocean.

夏威夷群岛附近形成的中尺度环环涡流将用于研究上升事件对开放源性植物植物学种群生产率，组成，生物量和生理学的影响。 最新的技术和方法学进步将被用来更准确地确定新产量与总产量（F-Ratio）以及该比率在开阔海洋中的时间和空间变异性的比率。 简单的经验模型和更复杂的隔室模型都将经过描述和解释观察到的F比率变化的能力进行测试。 新生产的估计将使用最近开发的硝酸盐分析方法获得+/- 2nm的精度。 总产量将从将无机碳标记为蛋白质的C-14掺入估计。 这种实验方法将消除许多与传统F-RATIO研究相关的潜在伪像和问题，包括由于添加非示踪剂量N-15的扰动，底物池的同位素稀释，难以测量环境底物浓度的难度，需要对分解的N和Menake进行三种形式的含量，并需要对溶解n和captim进行衡量。 海洋的生物生产力在地理上在很大程度上变化。 在巴辛亚热带地区，例如夏威夷群岛的宇宙，生产通常相对较低。 但是，当地水域的物理特征，例如在岛屿西部发现的圆形涡流，可以通过增加植物生长到地表水的养分供应来提高生产率。 法律和Bienfang将使用最先进的技术来衡量生物生产中的这些变化，并将其与浮游生物社区的结构联系起来。 他们将对新生产进行敏感测量，这对于估计地表水的有机材料的通量至关重要，及其可收获资源的可用性。 在发现海洋涡流的地区进行研究将提供可能在开阔的海洋中发现的广泛的生物海洋学条件。