Ecologic and evolutionary controls on shallow- marine ichnofaunas

浅海动物群的生态和进化控制

• 批准号: 311727-2008
• 负责人: Mangano, MariaGabriela
• 金额: $ 1.6万
• 依托单位: University of Saskatchewan
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2008
• 资助国家: 加拿大
• 起止时间: 2008-01-01 至 2009-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=396457
• 关键词: Ecologic; evolutionary; controls; shallow; marine

Ichnology involves the study of biogenic structures that result from the interactions between organisms and the substrate. Comparisons of ichnofaunas through geologic time reveal a complex interplay of ecologic and evolutionary controls. The different tracemakers and their specific responses to environmental changes reflect long-term macroevolutionary processes. Although ecologic controls have been the focus of ichnologic research, evolutionary aspects have been less explored. In particular, archetypal ichnofacies (distinctive suites of trace fossils), albeit recurrent in space and time, reflect changes through geologic time as a result of paleoecologic breakthroughs. The aim of this project is: (1) to compare marine ichnofacies through geologic time in terms of taxonomic composition, ecologic significance, and potential tracemakers, and (2) to discuss how faunal turnovers, degree of infaunalization, and colonization histories change the nature of archetypal ichnofacies during the Phanerozoic. The activities planned include: (1) fieldwork in several marine successions of different age, and (2) construction of a database of marine ichnofacies. To a lesser extent, the project will involve revision of trace fossil collections as supplementary information. Ichnologic information has been obtained from a number of stratigraphic units, spanning the Cambrian to the Neogene. These include the early Paleozoic of Argentina, Bolivia, Canada and Jordan, the late Paleozoic of Argentina, Brazil, England and United States, the Mesozoic of Argentina, Australia, Romania and United States, and the Cenozoic of Argentina, Chile, Venezuela and Romania. Additional fieldwork is focused on both critical intervals from a macroevolutionary perspective (Cambrian, Ordovician) and times with sparse ichnologic information (e.g. Devonian, Paleogene) . The database will be constructed based on critical examination of the literature, trace fossil specimens and field data. The database will include ichnotaxonomic composition, preservation styles, ethology, feeding strategies, tiering structure, ichnoguild assessment, age, and depositional environment.

遗迹学涉及对生物体与基质之间相互作用产生的生物结构的研究。通过比较地质时期的遗迹动物群揭示了生态和进化控制的复杂相互作用。不同的示踪剂及其对环境变化的特定反应反映了长期的宏观进化过程。虽然生态控制一直是遗迹学研究的重点，但进化方面的探索较少。特别是，原型遗迹相（遗迹化石的独特套件），尽管在空间和时间上反复出现，但反映了作为古生态突破的结果的地质时代的变化。该项目的目的是：（1）在分类组成，生态意义和潜在的痕迹标记方面，通过地质时间比较海洋遗迹相，（2）讨论动物群的更替，动物群的程度，殖民历史如何改变原型遗迹相的性质在中生代。计划开展的活动包括：（2）建立了海相遗迹相数据库。在较小的程度上，该项目将涉及修订作为补充信息的痕迹化石收藏。从寒武纪到新近纪的许多地层单位中获得了遗迹学信息。其中包括阿根廷、玻利维亚、加拿大和约旦的早古生代，阿根廷、巴西、英国和美国的晚古生代，阿根廷、澳大利亚、罗马尼亚和美国的中生代，以及阿根廷、智利、委内瑞拉和罗马尼亚的新生代。额外的野外工作集中在两个关键间隔从宏观演化的角度（寒武纪，奥陶纪）和时代与稀疏遗迹信息（如泥盆纪，古近纪）。该数据库将在对文献、微量化石标本和野外数据进行严格审查的基础上建立。该数据库将包括遗迹分类组成，保存风格，行为学，喂养策略，分层结构，遗迹群评估，年龄和沉积环境。