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Dissertation Research: Patterns of Morphological Evolution in Late Paleozoic Seeds

论文研究：晚古生代种子的形态演化模式

基本信息

批准号：
9801607
负责人：
Michael Foote
金额：
$ 0.99万
依托单位：
University of Chicago
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
1998
资助国家：
美国
起止时间：
1998-06-15 至 2000-05-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9801607&HistoricalAwards=false
关键词：
Dissertation Research Patterns Morphological Evolution

项目摘要

9801607 Foote The origin of the seed in the Late Devonian was a key innovation that facilitated the exploitation of a wide range of terrestrial environments and diverse ecological strategies during the early evolution of plants on land. Throughout the late Paleozoic, seed plants radiated in environments with ecological dynamics and organization that were fundamentally different from those of the Recent, most notably in the absence of tetrapod herbivory, limited direct plant-insect interactions, and strong phylogenetic partitioning of ecological strategies among different plant groups. The fossil seed record of the late Paleozoic provides an opportunity to study how increasing complexity and modernization of ecological interactions was reflected in structural adaptations to protect and disperse propagules. The research proposed here includes analyses of taxonomic diversity and morphological disparity in subclades of late Devonian to Permian fossil seed plants. The evolutionary significance of seed size will be examined by testing for trends in volume. A morphospace based on seed morphology will be used to test hypothesized patterns of morphological and ecological overlap among seed plant subclades. This research will be the first quantitative treatment of macroevolutionary patterns during the early history of a major group of land plants and will contribute to understanding of the unique structure of late Paleozoic terrestrial ecosystems.

9801607提出泥盆纪晚期种子的起源是一项关键的创新，在陆地植物的早期进化过程中，它促进了对广泛陆地环境和不同生态战略的开发。在整个晚古生代，种子植物在生态动态和组织结构上与最近的环境有根本的不同，最明显的是没有四足动物食草性的环境，有限的植物-昆虫直接相互作用，以及不同植物群之间生态策略的强烈系统发育划分。晚古生代的化石种子记录为研究生态相互作用日益复杂和现代化如何反映在保护和分散繁殖的结构适应中提供了机会。研究内容包括分析晚泥盆世至二叠纪化石种子植物亚门的分类多样性和形态差异。种子大小的进化意义将通过检测种子体积的趋势来检验。基于种子形态的形态空间将被用来测试种子植物亚纲之间形态和生态重叠的假设模式。这项研究将是第一次对一大类陆地植物早期历史中的宏观进化模式进行量化处理，并将有助于理解晚古生代陆地生态系统的独特结构。