Phylogeny of Skeletonema (Bacillariophyceae)

骨条藻（硅藻纲）的系统发育

• 批准号: 9119405
• 负责人: Jane Gallagher
• 金额: $ 32万
• 依托单位: CUNY City College
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-01-15 至 1996-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9119405&HistoricalAwards=false
• 关键词: Phylogeny; Skeletonema; Bacillariophyceae

This study will result in rigorous inferences of phylogeny for the marine diatom genus Skeletonema using molecular and morphometric methods in a cladistic framework. It is proposed that this genus can serve as a model system for exploring methods and controversies in the phylogeny reconstruction of primarily asexual organisms at lower phylogenetic levels. The following issues will be explored: 1. Levels of divergence among populations and species measured using chloroplast DNA (cpDNA), nuclear rDNA, and a single copy gene nucDNA gene; 2. Relationships of gene trees and species trees at lower phylogenetic levels; 3. Concordance of molecular and morphological data analyzed using phylogenetic systematic methods. It is hypothesized that the most primitive members of the genus are heavily silicified forms endemic to high-light, oligotrophic warm marine environments and that the most derived members are lightly silicified forms inhabiting turbid, eutrophic temperate freshwater and brackish water environments. The ecological importance and the wealth of background data available for Skeletonema make it an ideal system in which to test hypotheses of adaptation in an historical context.

这项研究将导致严格的推论， 利用分子和形态计量学方法研究海洋硅藻属双丝藻 方法在一个分支系统的框架。 据推测，该属 可以作为探索方法和争议的模型系统 在主要是无性生物的生殖重建中， 较低的系统发育水平。 将探讨以下问题： 1.测量的种群和物种之间的差异程度 利用叶绿体DNA（cpDNA）、核rDNA和单拷贝基因 核DNA基因; 2.基因树与物种树的关系. 较低的系统发育水平; 3.分子和 形态学数据分析使用系统发育的方法。 据推测，该属最原始的成员是 高度硅化的形式是高光照、贫营养的温暖气候所特有的， 海洋环境和最衍生的成员是轻 硅化的形式居住在混浊的，富营养的温带淡水 和微咸水环境。 生态的重要性和 丰富的背景数据，可用于螺旋藻，使其成为一个 一个理想的系统，在这个系统中， 历史背景。