Extracellular Carbon and Sulfur Production by Arctic Phytoplankton during the Spring Bloom

本研究建议评估北极浮游植物的碳和硫预算的替代途径的重要性，并确定是否营养限制和温度控制的碳和硫预算的不同有机池的大小，以及这些不同的矿物质池的生产率。 浮游植物可以作为二氧化碳的吸收器，也可以作为二甲硫醚的来源。 在北极沃茨春季水华期间，大量浮游植物生物量积累，硅藻和其他藻类等藻类类群占主导地位。 PI以前的工作表明，极地浮游植物可以比以前想象的更强地生产溶解的有机碳和硫。 这些物种在极地海洋高产沃茨的广泛分布，使得了解这一系统的变化非常重要。 PI建议区分藻类粘液和溶解碳库的产生，并确定它们对光合固定碳总排泄的相对重要性，确定棕囊藻和硅藻在碳和硫途径中的作用，检查指数和稳定生长期间碳和硫分配的变化，研究养分限制对有机碳和硫产生的影响。

This study proposes to assess the importance of alternative pathways in the carbon and sulfur budgets of Arctic phytoplankton and to determine whether nutrient limitation and temperature control the size of the different organic pools of the carbon and sulfur budgets as well as the production rate of these different mineral pools. Phytoplankton may act as a sink for carbon dioxide and act as a source of dimethylsulfide. Large phytoplankton biomass accumulates during spring blooms in Arctic waters, where algal taxa such as diatoms and other algae dominate. Previous work by the PIs indicated that polar phytoplankton can be strong producers of dissolved organic carbon and sulfur than previously thought. The widespread distribution of these species in highly productive waters of the polar seas makes understanding the variability of this system highly critical. The PIs propose to differentiate between the production of algal mucilage and dissolved carbon pools and determine their relative importance to the total excretion of photosynthetic fixed carbon, to determine the role of Phaeocystis and diatomaceous algae in carbon and sulfur pathways, to examine the changes in partitioning of carbon and sulfur during exponential and stationary growth, and to study the role of nutrient limitation on organic carbon and sulfur production.