ABR: Phylogenetic Relationships of the Freshwater Genera ofthe Centric Diatom Family Thalassiosiraceae

ABR：中心硅藻科海藻科淡水属的系统发育关系

• 批准号: 8818238
• 负责人: Edward Theriot
• 金额: $ 7.95万
• 依托单位: Academy of Natural Sciences Philadelphia
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-01-15 至 1991-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8818238&HistoricalAwards=false
• 关键词: ABR; Phylogenetic; Relationships; Freshwater; Genera

In an Accomplishment-Based Renewal of his pioneering cladistic and morphometric studies of diatoms, Dr. Edward Theriot of Philadelphia's Academy of Natural Sciences will examine two major groups of freshwater diatoms of the northern hemisphere, studying both fossil and living forms to determine patterns of evolutionary change. Morphological variability in diagnostic cell-wall features will be examined by light- and electron- microscopy in conjunction with statistical analyses. Reliable identification of diatom species will facilitate both basic taxonomic classification as well as stratigraphic interpretation of geological sediments, thus benefitting oil company geologists and paleontologists. Diatoms are among the most widespread and ecologically important plants in the world, despite their small size. They contribute significantly to photosynthesis in lakes and oceans as well as to geochemical cycling of silicon, a constituent of their cell walls. These siliceous cell walls accumulate in dense fossil deposits, providing unique opportunities to assess the record of evolutionary origins and extinctions in a major lineage of plants. Dr. Theriot's work thus provides insight concerning the linkage between climatic events and evolutionary changes during recent Earth history.

费城自然科学院的爱德华·塞里奥特博士在其开创性的硅藻分支和形态测量研究的成就基础上进行了更新，他将研究北半球的两大类淡水硅藻，研究化石和活体形式，以确定进化模式。改变。 诊断性细胞壁特征的形态变异性将通过光学和电子显微镜结合统计分析进行检查。 硅藻物种的可靠识别将有助于基本分类学和地质沉积物的地层解释，从而使石油公司地质学家和古生物学家受益。 尽管硅藻体积很小，但它是世界上分布最广泛、对生态最重要的植物之一。 它们对湖泊和海洋的光合作用以及硅（细胞壁的组成部分）的地球化学循环做出了重大贡献。 这些硅质细胞壁堆积在致密的化石沉积物中，为评估主要植物谱系的进化起源和灭绝记录提供了独特的机会。 因此，Theriot 博士的工作提供了有关近代地球历史中气候事件与进化变化之间联系的见解。