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气旋涡流将用于研究上升流事件对公海浮游植物种群的生产力、组成、生物量和生理的影响。 最近的技术和方法进步将用于更准确地确定新产量与总产量的比率（f 比率）以及该比率在公海中的时间和空间变化。 简单的经验模型和更复杂的区室模型都将测试其描述和解释观察到的 f 比变化的能力。 新产量的估算将使用最近开发的硝酸盐分析方法来获得，精度为+/- 2nM。 总产量将通过将 C-14 标记的无机碳掺入蛋白质中来估算。 这种实验方法将消除与传统 f 比研究相关的许多潜在伪影和问题，包括添加非示踪剂量的 N-15、底物池的同位素稀释、测量环境底物浓度的困难、需要测量至少三种形式的溶解氮的吸收，以及细菌可能占铵吸收的很大一部分这一事实。 海洋的生物生产力因地理位置的不同而有很大差异。 在中部盆地亚热带地区，例如夏威夷群岛附近，产量通常相对较低。 然而，当地水域的物理特征，例如岛屿西部发现的圆形涡流，可以通过增加地表水域植物生长的养分供应来提高生产力。 Laws 和 Bienfang 将使用最先进的技术来测量生物生产中的这些变化，并将其与浮游生物群落的结构联系起来。 他们将对新产量进行敏感测量，这一参数对于估计地表水中有机物质的通量及其可收获资源的可用性至关重要。 在发现海洋涡流的区域进行研究将提供可能在公海中发现的广泛的生物海洋学条件。