Collaborative Research: A Depositional and Paleoecological Model of Neogene Reef Development in the Dominican Republic: Integrating Taxonomic and Chronostratigraphic Databases
合作研究:多米尼加共和国新近纪珊瑚礁发育的沉积和古生态模型:整合分类学和年代地层数据库
基本信息
- 批准号:0446768
- 负责人:
- 金额:--
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2005
- 资助国家:美国
- 起止时间:2005-05-01 至 2008-04-30
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
This study represents an important first step in constructing the chronostratigraphic framework needed for regional correlation and environmental interpretation for shallow marine benthic communities in the tropical Western Atlantic between 6 and 1 Ma. The research provides a stratigraphic and environmental framework for evaluating faunal turnover and community change. It addresses questions including: (1) if/how did reef communities change over time during an episode of turnover which shaped the development of modern Caribbean reef ecosystems, and (2) if/how were these changes related to changes in the environment. New data on benthic foraminifera are being combined with information on sedimentary features to interpret depositional environments. The resulting stratigraphic and environmental framework is used to assess patterns of temporal and spatial variation in both reef coral and free-living coral communities and their environmental correlates. The project also explores the relationship between community change, speciation, and extinction in order to better understand the ecological processes involved as new species were added to communities and extinct species were removed.Shallow marine benthic communities in the area were profoundly altered by biotic turnover associated with the closure of the Central American isthmus and the onset of Northern hemisphere glaciation. Changes in taxonomic composition and community structure are well documented in corals and mollusks and in many other marine organisms. These events were responsible for shaping the composition and structure of modern-day shallow benthic communities in the Caribbean region. The causes of turnover are controversial and poorly understood, in part because most evolutionary studies are not performed within the context of a rigorous stratigraphic and environmental framework. High-resolution chronostratigraphy is needed for determining the timing of evolutionary events, and for reconstructing regional changes in ocean circulation and sea level that affected environmental factors such as nutrients and temperature. As part of this work, the group is revising the systematics of one of the most important ecological dominants, the Stylophora, which became extinct in the Caribbean at the end of the turnover.By adding new data types to the Neogene Marine b(I)ota of Tropical America (NMITA) taxonomic database at the University of Iowa and linking NMITA with CHRONOS, the project provides information to the paleontological community. Specifically, the team are developing an integrated chronostratigraphic model for a classic, richly fossiliferous sequence extending from ~6-3 Ma, the Cibao Valley of the northern Dominican Republic. The sequence contains more first occurrences of reef corals than any other known Caribbean sequence (37 of the 91 recorded species first occur) and is therefore critical for understanding speciation events during turnover.
这项研究代表了构建 6 至 1 Ma 热带西大西洋浅海底栖群落区域相关和环境解释所需的年代地层框架的重要第一步。该研究为评估动物更替和群落变化提供了地层和环境框架。它解决的问题包括:(1)在塑造现代加勒比珊瑚礁生态系统发展的更替时期,珊瑚礁群落是否/如何随时间变化,以及(2)这些变化是否/如何与环境变化相关。有关底栖有孔虫的新数据正在与沉积特征信息相结合,以解释沉积环境。由此产生的地层和环境框架用于评估珊瑚礁珊瑚和自由生活的珊瑚群落及其环境相关性的时间和空间变化模式。该项目还探讨了群落变化、物种形成和灭绝之间的关系,以便更好地了解新物种添加到群落和灭绝物种被清除所涉及的生态过程。该地区浅海底栖群落因中美洲地峡关闭和北半球冰川作用开始相关的生物更替而发生了深刻的改变。珊瑚、软体动物以及许多其他海洋生物的分类组成和群落结构的变化都有详细记录。这些事件塑造了加勒比地区现代浅层底栖群落的组成和结构。更替的原因存在争议且知之甚少,部分原因是大多数进化研究不是在严格的地层和环境框架内进行的。需要高分辨率年代地层学来确定进化事件的时间,并重建影响营养物和温度等环境因素的海洋环流和海平面的区域变化。作为这项工作的一部分,该小组正在修订最重要的生态优势物种之一的系统学,该物种在更新结束时在加勒比海地区灭绝。通过向爱荷华大学的新近纪热带美洲海洋生物 (NMITA) 分类数据库添加新的数据类型并将 NMITA 与 CHRONOS 连接起来,该项目为古生物学界提供了信息。具体来说,该团队正在为多米尼加共和国北部 Cibao 山谷约 6-3 Ma 范围内的经典、富含化石的序列开发一个综合年代地层模型。该序列包含的珊瑚礁珊瑚的首次出现数量比任何其他已知的加勒比序列都要多(91 个记录物种中的 37 个首次出现),因此对于了解更替期间的物种形成事件至关重要。
项目成果
期刊论文数量(0)
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Donald McNeill其他文献
Donald McNeill的其他文献
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