An investigation of Peramorphosis in isorophinid edrioasteroid echinoderms

异棘皮类小行星棘皮动物的超形态研究

• 批准号: 0745918
• 负责人: Colin Sumrall
• 金额: $ 13.77万
• 依托单位: University of Tennessee Knoxville
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-04-15 至 2013-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0745918&HistoricalAwards=false
• 关键词: investigation; Peramorphosis; isorophinid; edrioasteroid; echinoderms

Investigating the Role of Heterochrony in the Evolution of EdrioasteroidsColin Sumrall, University of Tennessee, KnoxvilleEAR-0745918Heterochrony, evolution by changing the timing of morphological change during ontogeny, is an important evolutionary mechanism throughout the Phanerozoic. In most clades, paedomorphosis (adult descendents having characteristics of the ancestral juvenile) is commonly cited as the dominant pattern. In isorophids, however, peramorphosis (adult descendants with characteristics that are overdeveloped with respect to their ancestors) is the dominant pattern in the ambulacral feeding apparatus. This two-year project aims to collect and interpret phylogenetic, and ontogenetic, data for isorophid edrioasteroids and use these data to investigate the different ways in which isorophid edrioasteroids are specializing via heterochrony. Phylogeny will be reconstructed using maximum parsimony on a genus level data matrix for all isorophid edrioasteroids. Ontogeny will be studied using elemental fate mapping and allometric studies of growth. These two areas will be combined to investigate portions of the phylogenetic history of isorophids where heterochrony played an important role and determine if different styles of heterochrony are dominant during the recovery from two mass extinctions (end Ordovician and Frasnian/Famennian). This project will involve graduate and undergraduate students directly into interdisciplinary research where they will learn new techniques. Minority undergraduate students will be included by collaboration with the NSF-funded East Tennessee Geosciences Program. Results will be incorporated into a web-based activity on organic evolution via heterochrony and middle school education modules on evolution for use in east Tennessee classrooms.

研究田纳西大学田纳西大学Edrioasteroidscolin Sumrall的演变中的作用，诺克斯维尔 - 0745918HETEROCHRONY，通过改变个体发育过程中形态变化的时间来进化，是整个phanerozoic的重要进化机制。在大多数进化枝中，通常将拟态形态（具有祖先少年特征的成年后代）被称为主要模式。 然而，在异吞细胞中，吞噬（成年后代与祖先相对于其祖先都过多发育）是肥胖喂养装置中的主要模式。这个为期两年的项目旨在收集和解释异藻型edioasteroids的系统发育和个体发生数据，并使用这些数据来研究通过异缘质体专长的异藻型edioasteroid的不同方式。 系统发育将使用所有同藻idrioasteroids上的最大简约数据矩阵重建。 将使用元素命运映射和生长的异形研究来研究个体发育。 这两个领域将合并，以研究异噬细胞的系统发育史的一部分，在这些史上起着重要作用，并确定在两个大规模灭绝（End Ordovician and Frasnian/Famennian）恢复期间，不同风格的异缘风格是否占主导地位。 该项目将涉及研究生和本科生直接参加跨学科研究，他们将学习新技术。 与NSF资助的东田纳西地球科学计划合作将包括少数群体的本科生。 结果将通过杂物和中学教育模块进行基于网络的有机进化活动，以在东田纳西州的教室中使用。