Controls on the Isotopic Composition of Phytoplankton

浮游植物同位素组成的控制

• 批准号: 9615744
• 负责人: Stuart Wakeham
• 金额: --
• 依托单位: Skidaway Institute of Oceanography
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-09-01 至 1999-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9615744&HistoricalAwards=false
• 关键词: Controls; Isotopic; Composition; Phytoplankton

9615744 Wakeham The isotopic carbon composition of the marine phytoplankton reflects not only the isotopic composition of seawater but also the environmental conditions under which photosynthesis occurs. Oceanographers and paleontologists are particularly interested in how phytoplankton isotopic composition is related to ambient temperature so that fossil organic matter preserved in marine sediments might be used to infer climatic conditions in the geologic past. Because variety of factors is responsible for the algal isotopic composition actually found, there is a need to understand their individual and collective impact. This research team from the University of Hawaii and the Scotia Institute of Oceanography will use laboratory and field studies to examine how conditions such as physiological state, growth rate, and environmental conditions affect carbon isotopic 'fractionation' by the phyplankton. The laboratory studies will involve careful culture work with two algal species, and the results will be compared to samples collected from the water column and sediments of the Arabian Sea and at the Hawaiian Ocean Time-Series station near Oahu using a mathematical model relating various physiological and environmental factors to algal isotopic composition.

9615744 Wakeham海洋浮游植物的同位素碳组成不仅反映了海水的同位素组成，也反映了光合作用发生的环境条件。海洋学家和古生物学家对浮游植物同位素组成与环境温度的关系特别感兴趣，因此保存在海洋沉积物中的化石有机物可能被用来推断地质过去的气候条件。由于各种因素是负责实际发现的藻类同位素组成，有必要了解他们的个人和集体的影响。这个来自夏威夷大学和斯科舍海洋研究所的研究小组将利用实验室和实地研究来研究生理状态、生长速度和环境条件等条件如何影响浮游植物的碳同位素“分馏”。实验室研究将包括对两种藻类进行仔细的培养工作，并将结果与从阿拉伯海的水柱和沉积物以及在夏威夷海洋时间序列站收集的样本进行比较，使用的是将各种生理和环境因素与藻类同位素组成联系起来的数学模型。