Quantification of ontogenetic change in Triassic ammonoids

三叠纪菊石个体发生变化的量化

• 批准号: 138321663
• 负责人: Privatdozent Dr. Dieter Korn
• 金额: --
• 依托单位: Museum für Naturkunde - Leibniz-Institut für Evolutions- und Biodiversitätsforschung (MfN)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2009
• 资助国家: 德国
• 起止时间: 2008-12-31 至 2011-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/138321663?language=en
• 关键词: Quantification; ontogenetic; change; Triassic; ammonoids

Mesozoic ammonoids are, with their complex suture lines and rich inventory of shell ornaments, strikingly different from the Palaeozoic predecessors. With the proposed project, the unfolding of conch characters during ontogeny will be introduced as an additional dimension complementing studies of taxonomic diversity and morphological disparity in Triassic ammonoids. The project focuses on two aspects of ammonoid conch growth: (1) The morphological disparity of selected Tethyan and eastern Pacific assemblages of Triassic ammonoids will be analysed and compared with representative Palaeozoic faunas by using quantitative methods such as Fourier Analysis and Principal Component Analysis. We will test if the ammonoids, after their dramatic decline near the Permian-Triassic Boundary, reached similar grades of morphological variation as the species-rich Palaeozoic assemblages. These investigations will focus on the morphometric characters of the conchs. (2) The ontogenetic change of Triassic ammonoid conchs will be quantified with the aim to correlate ontogenetic processes with phylogenetic hypotheses. A method for measuring ontogenetic change in conch morphology will be developed as a tool for Evo Devo studies in ammonoids.

中生代的菊石以其复杂的缝合线和丰富的壳饰，与古生代的菊石有着显著的不同。本项目将对三叠纪菊科植物的分类多样性和形态差异研究进行补充，进一步研究螺类在个体发育过程中的特征。(1)采用傅里叶分析和主成分分析等定量方法，分析特提斯和东太平洋三叠纪氨螺组合的形态差异，并与具有代表性的古生代动物群进行比较。我们将测试菊石在二叠纪-三叠纪界线附近急剧下降后，是否达到了与物种丰富的古生代组合相似的形态变化等级。这些研究将集中在海螺的形态特征上。(2)对三叠纪氨壳螺的个体发育变化进行量化，将个体发育过程与系统发育假说联系起来。将开发一种测量海螺形态个体发生变化的方法，作为在菊石中进行Evo Devo研究的工具。