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.

中生代的氨叶植物具有复杂的缝合线和丰富的壳装饰品清单，与古生代的前任截然不同。随着拟议的项目，将引入在本体发育过程中的海螺特征的展开，以补充三叠纪氨基型分类学多样性和形态差异的附加维度。该项目的重点是氨基类螺旋生长的两个方面：（1）将分析选定的Tethyan和东太平洋组合的三叠纪氨基氨基植物的形态差异，并通过使用诸如傅立叶分析和主要组分分析等定量方法与代表性的古生代动物群进行比较。我们将测试氨基化的二叠纪三叠纪边界附近的急剧下降后，是否达到了与富含物种的古生代组合的形态变异等级。这些调查将集中于海螺的形态特征。 （2）将量化三叠纪氨基蛋白酶的个体发生变化，目的是将个体发育过程与系统发育假设相关联。一种测量螺旋形态变化的方法将被开发为用于氨基化研究的EVO DEVO研究的工具。