权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Late Paleozoic larval paleobiology and evolutionary dynamics inferred from molluscs of the Buckhorn Asphalt and other lagerstätten

从鹿角沥青和其他矿床的软体动物推断的晚古生代幼虫古生物学和进化动力学

基本信息

批准号：
24818580
负责人：
Professor Dr. Alexander Nützel
金额：
--
依托单位：
Staatssammlung für Paläontologie und Geologie
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2006
资助国家：
德国
起止时间：
2005-12-31 至 2010-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/24818580?language=en
关键词：
Late Paleozoic larval paleobiology evolutionary

项目摘要

Many important paleobiological questions can only be solved by the analysis of exceptionally wellpreserved fossils such as the molluscs (especially gastropods) from the Pennsylvanian Buckhorn Asphalt (Oklahoma, USA). This fossil lagerstätte contains by far the best preserved Paleozoic mollusc material including larval shells, original shell mineralogy and microstructures. Mollusc shells reflect ontogenetic change to a high degree. Paleozoic early ontogenetic shells including larval shells are rarely preserved and have been used for taxonomic purposes only. However, the information content of early ontogenetic shells is much higher. The abundance of gastropod larval shells with planktotrophic larval development forms a proxy for ancient primary production even if direct fossil record of phytoplankton is lacking as is the case during the enigmatic Late Paleozoic ¿Phytoplankton Blackout¿. We want to quantify the proportion of planktotrophic mollusc species from the Buckhorn Asphalt and other sites with exceptional preservation as evidence for primary production during the Carboniferous. This will be an important step towards the reconstruction of Late Paleozoic food webs, paleocommunities, and paleodiversity. We are aware that planktotrophic gastropod larval shells may or may not resemble adult shells within the same individual. Therefore, we want to test the activity of heterochrony through a comparative morphospace analysis of larval and adult shells. Heterochrony is one of the most discussed evolutionary processes and gastropods belong to the best objects to study these processes in deep time.

许多重要的古生物学问题只能通过分析保存异常完好的化石来解决，例如来自宾夕法尼亚州巴克霍恩沥青（俄克拉荷马州，美国）的软体动物（特别是腹足类动物）。这个化石lagerstätte包含迄今为止保存最好的古生代软体动物材料，包括幼虫壳，原始壳矿物学和微观结构。软体动物的贝壳在很大程度上反映了个体发育的变化。古生代早期个体发育的贝壳，包括幼体贝壳，很少被保存下来，仅用于分类学目的。然而，早期个体发育壳的信息含量要高得多。丰富的腹足类幼虫壳与营养型幼虫发育形成了古代初级生产的代理，即使浮游植物的直接化石记录是缺乏的情况下，在神秘的晚古生代。我们要量化的比例，营养型软体动物物种的鹿角沥青和其他网站的特殊保护作为证据，在石炭纪的初级生产。这将是重建晚古生代食物网、古群落和古生物多样性的重要一步。我们知道，在同一个体中，嗜食性腹足类幼体的壳可能类似于或可能不类似于成体的壳。因此，我们想通过比较幼虫和成虫贝壳的形态空间分析来测试异时性的活动。异时性是目前研究最多的进化过程之一，腹足类是研究这些过程的最佳对象。