SGER: Morphological CT Scan of Notropis megalepis for Phylogenetic and Evolutionary Studies

SGER：用于系统发育和进化研究的 Notropis megalepis 形态学 CT 扫描

• 批准号: 0137734
• 负责人: Richard Mayden
• 金额: $ 0.74万
• 依托单位: Saint Louis University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-01-01 至 2003-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0137734&HistoricalAwards=false
• 关键词: SGER; Morphological; CT; Scan; Notropis

Historically, the stark contrast in diversity between North America's sunfish and minnow and shiner species served as a fertile research area for studying differential rates of evolution in two groups of equal age (based on fossil record). Cladistic analyses of osteological characters revealed fundamental flaws with previous studies of this nature and classifications of these fishes, thus questioning the accuracy of prior evolutionary studies. Today, phylogenetic relationships of species of Notropis (shiners) and relatives are relatively well known due to recent morphological and molecular analyses by the PI and collaborators as well as other researchers. Relationships of species of Centrarchidae, also soon to be available using morphological and molecular data, will provide the necessary information to begin comparative studies between the sunfish and shiner groups as envisioned by earlier researchers - rate heterogeneity in evolution. However, a notable problem remaining in advancing this research is the phylogenetic placement of the species Notropis megalepis, the species used to date the Notropis lineage, to a clade appropriate for comparison. The PI proposes to conduct high-resolution CT scans of the fossil Notropis megalepis from the Middle Pliocene of western Kansas using the recent technology developed at The University of Texas NSF Multi-user facility maintained by Dr. Tim Rowe. This fossil is fundamental in dating the age of the North American shiner and minnow group to which it belongs and evaluating rate heterogeneity in evolution for these two groups of fishes. Producing accurate estimates of evolutionary relationships is necessary for the overall framework for information retrieval and biological prediction. Uses of such information and predictability include tracking the origins of disease, identifying biological control agents for invasive species, and evaluating risk factors associated with biological conservation.

从历史上看，北美人的翻车鱼与小鱼和光泽物种之间多样性的形成鲜明对比，是研究两组等年龄段（基于化石记录）的肥沃研究领域。 对骨学特征的覆盖分析揭示了对这些鱼类性质和分类的先前研究的基本缺陷，从而质疑了先前的进化研究的准确性。 如今，由于PI和合作者以及其他研究人员的最新形态学和分子分析，Notropis（Shiners）和亲戚物种的系统发育关系相对众所周知。 Centrarchidae的物种的关系，也很快使用形态学和分子数据可用，将提供必要的信息，以开始在较早的研究人员所设想的人之间的比较研究 - 进化中的速率异质性。 但是，在推进这项研究的过程中仍然存在一个值得注意的问题是该物种Notropis Megalepis的系统发育位置，该物种是用于比较的物种，该物种是使用诺特罗皮斯谱系的物种。 PI建议使用德克萨斯大学NSF大学NSF分校多用户设施由Tim Rowe博士维护的最新技术，对堪萨斯州西部中部上新世进行高分辨率的CT扫描。 这种化石对于约会北美发光片和巨头群体的年龄至关重要，并评估这两组鱼类的进化速率异质性。 对于信息检索和生物学预测的总体框架，必须对进化关系进行准确的估计。 此类信息和可预测性的使用包括跟踪疾病的起源，确定入侵物种的生物控制剂，并评估与生物保护相关的危险因素。