Climate-Induced Shifts in Alpine Diatom Communities: Linking Neoecological and Paleoecological Approaches to Incorporate Responses to Trophic Forcing

气候引起的高山硅藻群落变化：将新生态学和古生态学方法联系起来以纳入对营养强迫的响应

• 批准号: 0639901
• 负责人: Jasmine Saros
• 金额: $ 48.26万
• 依托单位: University of Wisconsin-La Crosse
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-01-15 至 2007-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0639901&HistoricalAwards=false
• 关键词: Climate; Induced; Shifts; Alpine; Diatom

Diatoms are a class of microscopic algae that are sensitive to environmental changes. Diatom fossils from lake sediments in the central and northern Rocky Mountains indicate that various Cyclotella species have increased during the 20th century. This increase is often attributed to climate change, but the mechanisms involved have not yet been tested. To decipher the mechanisms by which climate change has altered diatom community structure, paleoecological analyses will be coupled with experimental approaches. Fossil records from lake sediments will be used along with tree rings to provide information on climate trends over the last 2000 years. A series of laboratory and field experiments will be used to assess the mechanisms by which climate-related parameters drive changes in these diatoms. The broader impacts of the proposed work include a greater understanding of the response of alpine lakes to climate change; many of these lakes are located in national parks and forests and have high aesthetic and recreational value. This research will address several research needs identified by Glacier National Park, hence it will potentially provide critical information to park managers. Saros will speak at Glacier National Park's 2009 Science & History Conference, which is attended by the public. The investigators will also develop a Resource Bulletin on the results as part of the park's series on climate change. This research will also provide training for two graduate and nine undergraduate students.

硅藻是一类对环境变化敏感的微小藻类。落基山脉中部和北部湖泊沉积物中的硅藻化石表明，各种环藻物种在20世纪有所增加。这种增加通常归因于气候变化，但其机制尚未得到检验。为了破译气候变化改变硅藻群落结构的机制，古生态分析将与实验方法相结合。湖泊沉积物的化石记录将与树木年轮一起用于提供过去2000年气候趋势的信息。将使用一系列实验室和实地实验来评估与气候有关的参数驱动这些硅藻变化的机制。拟议工作的更广泛影响包括：加深对高山湖泊对气候变化的反应的了解；许多这样的湖泊位于国家公园和森林中，具有很高的审美和娱乐价值。这项研究将解决冰川国家公园确定的几个研究需求，因此它将潜在地为公园管理人员提供关键信息。Saros将在冰川国家公园的2009年科学与历史会议上发表演讲，该会议由公众参加。调查人员还将根据调查结果制作一份资源公报，作为该公园气候变化系列的一部分。本研究亦将为两名研究生及九名本科生提供培训。