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

在一个基于成就的更新他的开创性 硅藻的分支和形态测量研究，爱德华·塞里奥特博士 费城自然科学院的科学家将研究两个 北方淡水硅藻的主要群体， 研究化石和生命形式，以确定 进化的变化 诊断中的形态变异性 细胞壁特征将通过光和电子进行检查， 显微镜检查结合统计分析。 可靠 硅藻种类鉴定将有助于 分类与地层解释 石油公司的地质学家 和古生物学家 硅藻是分布最广的， 世界上最重要的植物，尽管它们的体积很小。 他们 对湖泊和海洋中的光合作用有着重要的贡献， 以及硅的地球化学循环， 细胞壁 这些硅质细胞壁以致密的 化石矿床，提供了独特的机会，以评估 在一个主要世系中的进化起源和进化的记录 植物。 因此，Theriot博士的工作提供了关于 气候事件和进化变化之间的联系 在地球近代史上。

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.