Nitrate Kinetics of Oceanic Ultraphytoplankters in Response to Transient Nanomolar Substrate Perturbations

海洋超浮游植物响应瞬态纳摩尔底物扰动的硝酸盐动力学

• 批准号: 9000263
• 负责人: Dennis Taylor
• 金额: $ 31.8万
• 依托单位: Bigelow Laboratory for Ocean Sciences
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-07-01 至 1992-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9000263&HistoricalAwards=false
• 关键词: Nitrate; Kinetics; Oceanic; Ultraphytoplankters; Response

The nitrate supply to the euphotic layer plays a key role in oceanic (and therefore global) carbon fluxes. Since ultraphytoplankton dominate these waters, their nitrate uptake arguably controls these processes. However, it is now believed that episodic nitrate pulses provide a significant fraction of the total annual primary productivity in the central gyres, yet the response of ultraphytoplankters to ecologically significant nitrate perturbations in nitrate concentration is likely to be a factor in species success of oceanic ultraphytoplankters. Drs Glover and Garside will characterize the kinetic response of oceanic algal and Synechococcus clones of ultraphytoplanton to ecologically significant (Nanomolar) increases in nitrate, using the chemiluminescent method. Experiments will involve measuring nitrate uptake, on a subsample of a nitrate-limited chemostat culture, exposed to different nitrate concentrations, but under the same temperature and light conditions as the parent culture. Their studies will contribute to understanding physical, chemical and physiological interactions that integrate to mediate 'new' nitrate-based production and ultimately control the oceans as a CO2 sink.

真光层的硝酸盐供应在 海洋（以及全球）碳通量。以来 超浮游植物控制着这些沃茨，它们的硝酸盐吸收 可以说控制着这些过程。 然而，现在人们相信， 间歇性的硝酸盐脉冲提供了 中央环流的年初级生产力总量， 超植生植物对生态显著性 硝酸盐浓度的硝酸盐扰动可能是 海洋超植物群落物种成功的一个因素 格洛弗和加塞德博士将描述动力学反应 海洋藻类和聚球藻的克隆 到硝酸盐的生态显著（纳摩尔）增加， 使用荧光法。 实验将涉及 测量硝酸盐吸收，在硝酸盐限制的子样品上， 恒化器培养，暴露于不同的硝酸盐浓度， 但在相同的温度和光照条件下， 父母文化 他们的研究将有助于理解 物理、化学和生理相互作用， 整合以介导“新”硝酸盐基生产， 最终控制了海洋这个二氧化碳的汇。