Benthic Carbon Processes in the St. Lawrence Island Polynya:An Appraisal Using Oxygen Isotope Composition, Sediment Oxygen Uptake, and Benthic Community Analysis

圣劳伦斯岛冰间湖的底栖碳过程：利用氧同位素组成、沉积物吸氧量和底栖群落分析进行评估

• 批准号: 8921955
• 负责人: Jacqueline Grebmeier
• 金额: $ 14.34万
• 依托单位: University of Tennessee Knoxville
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-05-15 至 1993-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8921955&HistoricalAwards=false
• 关键词: Benthic; Carbon; Processes; St.; Lawrence

Polynyas, open water areas within ice covered seas, are thought to be important in sustaining primary and secondary productivity in polar regions. The project will investigate the influence of the St. Lawrence Polynya (SLIP) on benthic communities in the Bering Sea by utilizing 3 methods. The first method will use a newly demonstrated technique that takes advantage of the oxygen-18 signal incorporated from seawater into tunicate cellulose, providing an averaged seasonal metabolism signal for benthic productivity. The next method will test whether sediment oxygen uptake is enhanced in regions exposed to open water in the early spring, reflecting a larger cumulative organic detrital load. The last method will evaluate benthic community composition in the polynya benthos to test whether the presumed presence of enhanced early spring primary productivity has significant role in structuring macrofaunal diversity and biomass. The use of the stable oxygen isotope technique for analyzing tunicate cellulose, in combination with sediment respiration rates and traditional benthic sampling, will provide insight into the significance of the winter/spring polynya primary production.

冰盖海域内的开阔水域，被认为对维持极地地区的初级和次级生产力很重要。该项目将利用3种方法调查圣劳伦斯波利尼亚(SLIP)对白令海底栖动物群落的影响。第一种方法将使用一种新演示的技术，该技术利用海水中的氧-18信号结合到被衣纤维素中，为底栖动物的生产力提供平均的季节性新陈代谢信号。下一种方法将测试早春暴露在开阔水域的地区的沉积物摄氧量是否增加，反映出更大的累积有机碎屑负荷。最后一种方法将评估Polynya底栖动物的底栖生物群落组成，以测试假定存在的早春初级生产力增强是否对构建大型动物多样性和生物量具有重要作用。利用稳定的氧同位素技术分析衣酸盐纤维素，结合沉积物呼吸速率和传统的底栖生物采样，将有助于深入了解冬春季多年生草本植物初级生产的意义。