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

9301322 PREZELIN这个基于成就的项目建立在以前的研究基础上，这些研究试图1）确定浮游植物光谱特性的变化来源和幅度，这些特性决定光合量子产额，2）提供浮游植物如何利用辐射能的见解，影响水柱光学特性的光谱特性，并调节光合作用和光抑制的速率。本项目的主要目标是：1）进一步确定不同浮游植物在营养状态改变、动态光场和紫外辐射增强条件下光合电荷分离、放氧和固碳的量子产率之间的光谱联系; 2）确定不同光谱类群的浮游植物对环境变化的光合响应机制; 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中。这三个外地方案是：a）在荷兰进行的藻类池塘围隔生态系统实验研究，B）以年为时间尺度的南极洲帕尔默半岛沿海沃茨的沿着（南极LTER方案），以及c）在南极臭氧洞影响下的南方春季不同浮游植物生物群落（Icecolors 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). ***