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Palaeobiology, morphology and diversity of macrofaunas: A case study on Early Cretaceous ammonites

大型动物的古生物学、形态和多样性：以早白垩世菊石为例

基本信息

批准号：
175607855
负责人：
Professor Dr. Jens Lehmann
金额：
--
依托单位：
Geowissenschaftliche Sammlung
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2010
资助国家：
德国
起止时间：
2009-12-31 至 2013-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/175607855?language=en
关键词：
Palaeobiology morphology diversity macrofaunas case

项目摘要

The background for control mechanism regarding fluctuations in the abundance, diversity and morphological changes of fossil invertebrates is a complex but seminal field. Particularly the nutrient and sediment supply may be a major affluent on macrofossil fluctuations and essential for reconstructing their environmental background, but is not yet in the focus of current research. We plan to use associations of benthic and planktic foraminifers and calcareous nanoplankton to reconstruct oxygen and nutrient levels for Early Cretaceous oceans and to apply these data to the interpretation of ammonite ecology as a case for other macrofossil groups. This is considered an urgent matter of research, since ammonites are among the dominant and most important invertebrates of their times and their position in the food web may be a key for understanding marine ecosystems on the Mesozoic shelf. Only a few pioneer studies support this hypothesis yet, underlining the urgency of the matter. We propose to cover the bio- and lithofacies interpretation by sedimentological data and the independent time-control and correlation of sections by stable isotope supported by gamma ray data. Since nutrient supply is steered by climate conditions, we chose prime profiles across climatic belts in the Tethys, the central Atlantic as well as in northern Europe. We choose the Lower Aptian as a key substage, since this time interval contains the most prominent Early Cretaceous Oceanic Anoxic Event with a very wide distribution of low oxygen conditions, excellent carbon isotope records and the chance to study long and short term changes prior to, during and subsequent to the event.

关于化石无脊椎动物的丰度、多样性和形态变化的波动的控制机制的背景是一个复杂但具有开创性的领域。特别是营养盐和沉积物的供应可能是一个主要的丰富的宏体化石的波动和重建其环境背景是必不可少的，但尚未在目前的研究重点。我们计划使用协会的底栖和南极有孔虫和钙质nanoplankton重建早白垩世海洋的氧气和营养水平，并将这些数据用于解释菊石生态的其他宏体化石组的情况。这被认为是一个紧迫的研究问题，因为菊石是其时代的主要和最重要的无脊椎动物之一，它们在食物网中的地位可能是了解中生代大陆架海洋生态系统的关键。只有少数先驱研究支持这一假设，强调了问题的紧迫性。建议利用沉积学资料进行生物相和岩相解释，利用稳定同位素资料进行独立的时间控制和剖面对比。由于养分供应受气候条件的影响，我们选择了特提斯、大西洋中部以及北方欧洲气候带的主要剖面。我们选择下阿普第阶作为一个关键的子阶段，因为这个时间间隔包含了最突出的早白垩世海洋缺氧事件，具有非常广泛的低氧条件分布，出色的碳同位素记录和研究长期和短期变化的机会之前，期间和之后的事件。