Collaborative Research: Antarctic Ecosystems across the Permian-Triassic Boundary: Integrating Paleobotany, Sedimentology, and Paleoecology

合作研究：跨越二叠纪-三叠纪边界的南极生态系统：整合古植物学、沉积学和古生态学

• 批准号: 0943935
• 负责人: John Isbell
• 金额: $ 28.96万
• 依托单位: University of Wisconsin-Milwaukee
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-08-01 至 2015-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0943935&HistoricalAwards=false
• 关键词: Collaborative; Research; Antarctic; Ecosystems; across

Intellectual Merit:The focus of this proposal is to collect fossil plants and palynomorphs from Permian-Triassic (P-T) rocks of the central Transantarctic Mountains (CTM), together with detailed data on sedimentologic and paleoecologic depositional environments. Fossil plants are important climate proxies that offer a unique window into the past, and the CTM fossils are an important source of data on the ways that plants responded to a strongly seasonal, polar light regime during a time of global change. The proposed project uses paleobotanical expertise, integrated with detailed sedimentology and stratigraphy, to reconstruct Permian-Triassic plant communities and their paleoenvironments. This interdisciplinary approach could uncover details of Antarctica?s complex late Paleozoic and Mesozoic environmental and climatic history which included: 1) deglaciation, 2) development and evolution of a post-glacial landscape and biota, 3) environmental and biotic change associated with the end-Permian mass extinction, 4) environmental recovery in the earliest Triassic, 5) strong, possible runaway Triassic greenhouse, and 6) widespread orogenesis and development of a foreland basin system. The PIs will collect compression floras both quantitatively and qualitatively to obtain biodiversity and abundance data. Since silicified wood is also present, the PIs will analyze tree rings and growth in a warm, high-latitude environment for which there is no modern analogue. Fossil plants from the CTM can provide biological and environmental information to: 1) interpret paleoclimate when Gondwana moved from icehouse to greenhouse conditions; 2) trace floral evolution across the P-T boundary; 3) reconstruct Antarctic plant life; 4) further understanding of plant adaptations to high latitudes. The Intellectual Merit of the research includes: 1) tracing floral evolution after the retreat of glaciers; 2) examining floral composition and diversity across the PTB; and 3) obtaining data on the recovery of these ecosystems in the Early Triassic, as well as changes in floral cover and diversity in the Early-Middle Triassic. Antarctica is the only place on Earth that includes extensive outcrops of terrestrial rocks, combined with widespread and well-preserved plant fossils, which spans this crucial time period.Broader impacts:The broader impacts include public outreach; teaching, and mentoring of women and underrepresented students; mentoring graduate student, postdoctoral, and new faculty women; development of an inquiry-based workshop on Antarctic paleoclimate with the Division of Education, KU Natural History Museum; continuing support of workshops for middle school girls in science via the Expanding Your Horizons Program, Emporia State University, and the TRIO program, KU; exploring Antarctic geosciences through video/computer links from McMurdo Station and satellite phone conferences from the field with K-12 science classes in Wisconsin and Kansas, and through participation in the NSF Research Experiences for Teachers program at the University of Wisconsin.

知识分子的优点：该提案的重点是从中央跨抗山脉（CTM）的二叠纪三叠纪（P-T）岩石中收集化石植物和palynomorphs，以及有关沉积和古生物学沉积环境的详细数据。化石植物是重要的气候代理，可以为过去提供独特的窗口，而CTM化石是有关植物在全球变化时期对季节性强烈的极性光制响应方式的重要数据来源。拟议的项目使用古生物专业知识，并融合了详细的沉积学和地层学，以重建二叠纪 - 三叠纪植物群落及其古环境。这种跨学科的方法可以揭示南极复杂的晚期和中生代的环境和气候历史的细节，其中包括：1）退化，2）冰川后的发展和进化，后环境和生物群，3）环境和生物变化，与最终的伯米亚大规模播出相关的环境变化，4）在最终的环境范围内，4）可能是季后赛的较高态度，是较高的三亚利亚斯式三亚群岛，是5岁的三级跑步，5岁的三级态度，5岁的三级小径，5岁的三级小动物， 6）广泛的造山学和前陆盆地系统的发展。 PI将在定量和质量上收集压缩植物，以获取生物多样性和丰富数据。由于也存在硅化木材，PIS将在没有现代类似物的温暖，高纬度环境中分析树环和生长。 CTM的化石植物可以提供生物学和环境信息，以解释冈瓦纳从冰屋转移到温室条件时解释古气候； 2）沿P-T边界痕迹痕迹； 3）重建南极植物寿命； 4）进一步了解植物对高纬度的适应。研究的智力优点包括：1）追踪冰川后退后的花卉进化； 2）检查PTB的花卉组成和多样性； 3）获取有关早期三叠纪中这些生态系统恢复的数据，以及早期中型三叠纪的花卉覆盖率和多样性的变化。南极洲是地球上唯一的地方，其中包括大量的陆地岩石露头，再加上广泛而保存完好的植物化石，跨越了这个关键时期。公民的影响：更广泛的影响包括公众外展活动；妇女和代表性不足的学生的教学和指导；指导研究生，博士后和新教师； KU自然历史博物馆的教育部门开发了基于询问的南极古气候研讨会；通过扩展您的地平线计划，Emporia州立大学和KU的三重奏计划，继续为中学女生的讲习班继续支持；通过McMurdo Station的视频/计算机链接探索南极地球科学，并在威斯康星州和堪萨斯州的K-12科学课程中，以及通过参加威斯康星大学的NSF研究经验的NSF研究经验。