Photophysiological Regulation of Spectral Quantum Yield and Its Linkages to Bio-Optical Properties of Phytoplankton

9301322 PREZELIN这个基于成果的项目建立在先前研究的基础上，这些研究试图1)确定决定光合作用量子产率的浮游植物光谱特性的来源和变异性的大小，以及2)提供关于浮游植物如何利用辐射能量、影响水柱光学特性的光谱特性以及调节光合作用和光抑制速率的见解。这一以成果为基础的更新项目的主要目标是：1)进一步确定不同浮游植物在营养状态变化、动态光场和增强紫外线辐射下的光合作用电荷分离、氧释放和固定碳的量子产率之间的光谱联系；2)确定不同光谱组的浮游植物光合作用对环境变化作出反应的机制；以及3)将研究结果纳入三个独立资助的实地项目正在开发的生物光学模型。这三个实地方案是：a)荷兰藻池中附生生物实验研究；b)南极帕尔默半岛沿岸水域以年为时间尺度的研究(南极LTER方案)；c)南极臭氧层空洞影响下南半球春季不同浮游植物群落的研究(冰色93)。***

9301322 PREZELIN This Accomplishment Based Project builds on prior studies which sought to 1) identify the sources and magnitude of variability in phytoplankton spectral properties which determine photosynthetic quantum yield, and 2) provide insights into how phytoplankton utilize radiant energy, influence the spectral characteristics of water-column optical properties and regulate rates of photosynthesis and photoinhibition. The major objectives of this accomplishment based renewal project are to: 1) further define the spectral linkages between quantum yield for photosynthetic charge separation, oxygen evolution and carbon fixation in different phytoplankters exposed to altered nutrient status, dynamic light fields and enhanced ultraviolet radiation; 2) to identify the mechanisms by which different spectral groups of phytoplankton respond photosynthetically to environmental change; and 3) to incorporate the findings into bio-optical models being developed in three independently funded field programs. The three field programs are: a) a study of algal pond mesocosm experiments in the Netherlands, b) along the coastal waters of the Palmer Peninsula, Antarctica on the time scale of years (the Antarctic LTER program), and c) during the austral spring in diverse phytoplankton biomes under the influence of the Antarctic ozone hole (Icecolors 93). ***