Nutrient bioavailability and primary production in Lake Simcoe

锡姆科湖的养分生物利用度和初级生产

• 批准号: 390619-2010
• 负责人: Dillon, Peter
• 金额: $ 7.62万
• 依托单位: Trent University
• 依托单位国家: 加拿大
• 项目类别: Research Tools and Instruments - Category 1 (<$150,000)
• 财政年份: 2009
• 资助国家: 加拿大
• 起止时间: 2009-01-01 至 2010-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=443242
• 关键词: Nutrient; bioavailability; primary; production; Lake

The research program that this application will support is the examination of nutrient bioavailability and primary production in Lake Simcoe. Lake Simcoe is the largest inland lake in Ontario and the ice-fishing capital of Canada. It is also the source of drinking water to 8 municipalities and is under the threat of increased nutrient inputs. To date, primary production has never been measured on Lake Simcoe, and there has been no assessment of the microbial food web. Algae, or phytoplankton, form the base of the food web in lakes and understanding their primary production will determine the possible fish production in the lake. The main objective of this research program is to determine the limiting nutrient(s) to the phytoplankton communities in Lake Simcoe and the differences in primary production. This is being assessed with a thorough, year-round examination of microbial biomass, physiology and metabolism. If we can understand what controls the cycling of C, perhaps we can predict and mitigate the seasonal hypoxia and restore the cold-water fisheries to Lake Simcoe. This program currently involves 7 highly qualified personnel (HQP) including a postdoctoral fellow, 2 masters students, 2 undergraduate summer students and 2 technicians. This application is for four independent pieces of equipment required for the proposed research. The YSI Sonde is a field instrument used to profile the water column of lakes and it was selected due to its use in large lakes such as Simcoe where profiling is needed to deep depths under adverse weather conditions. The Water PAM is a specialized fluorometer used to assess the variable fluorescence of phytoplankton communities in water and is used to examine phytoplankton physiology and provide estimates of production. The isotope analyzer is a specialized, inexpensive and efficient tool to measure stable isotopes. The spectrophotometer will be used to measure dissolved nutrient concentrations in water.

该应用程序将支持的研究计划是检查锡姆科湖的养分生物利用度和初级生产。锡姆科湖是安大略省最大的内陆湖，也是加拿大的冰钓之都。它也是 8 个城市的饮用水源，并面临营养投入增加的威胁。迄今为止，锡姆科湖的初级生产从未进行过测量，也没有对微生物食物网进行评估。藻类或浮游植物构成了湖泊食物网的基础，了解它们的初级生产将决定湖泊中可能的鱼类产量。该研究计划的主要目标是确定锡姆科湖浮游植物群落的限制养分以及初级生产的差异。这是通过对微生物生物量、生理学和新陈代谢进行全年彻底的检查来评估的。如果我们能够了解控制 C 循环的因素，也许我们可以预测并减轻季节性缺氧并恢复锡姆科湖的冷水渔业。该项目目前共有7名高素质人才（HQP），其中博士后1名，硕士生2名，本科生暑期生2名，技术人员2名。该应用程序适用于拟议研究所需的四台独立设备。 YSI 探空仪是一种用于对湖泊水柱进行剖面分析的现场仪器，之所以选择它是因为它用于像锡姆科这样的大型湖泊，这些湖泊需要在恶劣天气条件下进行深层剖面分析。 Water PAM 是一种专用荧光计，用于评估水中浮游植物群落的可变荧光，并用于检查浮游植物生理学并提供产量估计。同位素分析仪是一种专门、廉价且高效的稳定同位素测量工具。分光光度计将用于测量水中溶解的营养物浓度。