Long-term Ecological Research (LTER) on the Antarctic Marine Ecosystem: Microbiology and Carbon Flux

每年浮冰的进退可能是主要的 结构时空变化的物理决定因素 和功能。 年际周期 和/或每年浮冰范围的趋势也可能 对各级食物网的重大影响， 每年的初级生产量对海鸟繁殖成功的影响。 历史记录表明，最多6至8年的周期 冬季的浮冰范围。 在这十年的冬天 在1980年和1981年更冷，在1986年和1987年再次冷。 在 为了了解浮冰和 生态系统动态，特别是井的影响， 有记录的代表性地区冰盖的年际变化 人口，长期生态研究（LTER）网站已被 建立在帕尔默附近的南极半岛地区 站 LTER项目将进行全面的 在这一地区以冰为主的生态系统的测量， 重点关注初级生产、磷虾种群和鱼群， 海鸟 重点将放在发展 生态系统模型，将提供预测能力， 与全球环境变化有关的问题。 该建议将增加现有的LTER项目的详细信息， 碳的地球化学循环和相关的 生物元素 LTER的微生物学和碳通量成分 将提供一套核心参数的测量， 碳循环，并将测试几个假设有关 包括细菌生产力和营养物质 再生

The annual advance and retreat of pack ice may be the major physical determinant of spatial/temporal changes in the structure and function of antarctic marine communities. Interannual cycles and/or trends in the annual extent of pack ice may also have significant effects on all levels of the food web, from total annual primary production to breeding success in seabirds. Historical records indicate a 6 to 8 year cycle in the maximum extent of pack ice in the winter. During this decade winters were colder in 1980 and 1981, and again in 1986 and 1987. In order to understand the interactions between pack ice and ecosystem dynamics, especially the influences of the well- documented interannual variability in ice cover on representative populations, a long-term ecological research (LTER) site has been established in the Antarctic Peninsula region near Palmer Station. The LTER project, will conduct comprehensive measurements of ice-dominated ecosystems in this region with a focus on primary production, krill populations and swarms and seabirds. A primary emphasis will be placed on the development of ecosystem models that will provide a predictive capability for issues related to global environmental change. This proposal will add to the existing LTER project detailed studies of the biogeochemical cycling of carbon and associated bioelements. The microbiology and carbon flux component of LTER will provide measurements of a suite of core parameters relevant to the carbon cycle and will test several hypotheses pertaining to carbon flux, including bacterial productivity and nutrient regeneration.