Photobiology of Sea Ice Microalgal Species

南大洋初级生产力主要来自水柱和海冰中的微藻光合作用。虽然开阔水域的产量似乎很低，但边缘冰区的产量似乎很高。最近的证据表明，海冰产量可能占南大洋生态系统产量的很大一部分。这项基于成就的更新提案将继续沙利文博士和他的团队进行的海冰藻类生产力研究。他们和其他人的结果表明，冰藻的生产力受到光照和温度的限制，而不是营养的可获得性。该项目将利用高分辨率显微光度技术、高效液相色谱技术和径迹显微放射自显影技术，重点研究个别海冰微藻物种的光生物学。实验室工作将确定在南极海冰系统的各种微生境中占主导地位的个体物种的光合作用参数。这将为开发海冰生态系统生产力模型提供必要的数据集。

Southern Ocean primary production derives largely from microalgal photosynthesis in the water column and in sea ice. While production in open waters appears low, production in the marginal ice zones appears to be high. Recent evidence suggests that sea ice production may account for a substantial fraction of Southern Ocean ecosystem production. This Accomplishment-Based Renewal proposal will continue the sea-ice algal productivity studies carried out by Dr. Sullivan and his team. Their results and those of others suggest that ice algal productivity is limited by light availability and temperature rather than nutrient availability. This project will focus on the photobiology of individual sea ice microalgal species using high resolution microphotometric techniques, high performance liquid chromatographic techniques, and track microautoradiography. Laboratory efforts will characterize the photosynthetic parameters for the individual species which dominate in various microhabitats of the Antarctic sea ice system. This will provide the data set necessary for the development of models of sea ice ecosystem productivity.