Collaborative Research: Understanding the Evolution of High-latitude Permo-Triassic Paleoenvironments and their Vertebrate Communities.

合作研究：了解高纬度二叠纪-三叠纪古环境及其脊椎动物群落的演化。

• 批准号: 1341304
• 负责人: Christian Sidor
• 金额: $ 32.04万
• 依托单位: University of Washington
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-09-01 至 2022-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1341304&HistoricalAwards=false
• 关键词: Collaborative; Research; Understanding; Evolution; latitude

Around 252 million years ago, a major mass extinction wiped out upwards of 90% of species on Earth. Coincident with this extinction, the Antarctic portion of the supercontinent of Pangea transitioned to a warmer climatic regime and became devoid of glaciers. Little is known about the survivors of the extinction in Antarctica, although it has been hypothesized that the continent's high latitude location shielded it from the worst of the extinction's effects. The Shackleton Glacier region is the best place to study this extinction in Antarctica because it exposes an abundance of correct age rocks and relevant fossils were found there in the 1960s and 1980s. For this research, paleontologists will study fossil vertebrates that span from about 260 to 240 million years ago to understand how life evolved at high latitudes in the face of massive climate change. In addition, geologists will use fossil soils and fossil plant matter to more precisely reconstruct the climate of Antarctica across this extinction boundary. These data will allow for a more complete understanding of ancient climates and how Antarctic life compared to that at lower latitudes. Undergraduate and graduate students will be actively involved in this research. Public engagement in Antarctic science will be accomplished at several natural history museums.This three-year project will examine the evolution of Permo-Triassic paleoenvironments and their vertebrate communities by conducting fieldwork in the Shackleton Glacier region of Antarctica. The team will characterize the Permo-Triassic boundary within Shackleton area strata and correlate it to other stratigraphic successions in the region (e.g. via stable carbon isotope stratigraphy of fossilized plant organic matter). The researchers will use multiple types of data to assess the paleoenvironment, including: 1) paleosol morphology; 2) paleosol geochemistry; 3) pedogenic organic matter; and 4) fossil wood chronology and stable isotopes. The Fremouw Formation of Antarctica preserves the highest paleolatitude (~70° S) tetrapod fauna of the entire Triassic and thus has the potential to shed important light on the evolution of polar life during the early Mesozoic. The biology of Triassic vertebrates from Antarctica will be compared to conspecifics from lower paleolatitudes through analysis of growth in bone and tusk histology. An interdisciplinary approach will be used to address relationships between environmental change, faunal composition, and biogeographic patterns in the context of the high-latitude strata preserved in the Buckley and Fremouw formations in the Shackleton Glacier region.

大约 2.52 亿年前，一场大规模灭绝消灭了地球上 90% 以上的物种。 与这次灭绝同时发生的是，盘古大陆超级大陆的南极部分转变为温暖的气候状态，并且没有冰川。 人们对南极洲大灭绝事件的幸存者知之甚少，尽管有人推测该大陆的高纬度位置使其免受大灭绝事件最严重的影响。 沙克尔顿冰川地区是研究南极洲这次灭绝事件的最佳地点，因为这里暴露出大量年龄正确的岩石，并在 20 世纪 60 年代和 1980 年代在那里发现了相关化石。 在这项研究中，古生物学家将研究距今约 260 至 2.4 亿年前的脊椎动物化石，以了解高纬度地区的生命在面对大规模气候变化时是如何进化的。 此外，地质学家将利用土壤化石和植物化石来更精确地重建跨越这一灭绝边界的南极洲的气候。 这些数据将使我们能够更全面地了解古代气候以及南极洲的生活与低纬度地区的生活相比如何。 本科生和研究生将积极参与这项研究。 公众对南极科学的参与将在几个自然历史博物馆完成。这个为期三年的项目将通过在南极洲沙克尔顿冰川地区进行实地考察来研究二叠纪-三叠纪古环境及其脊椎动物群落的演变。 该团队将描述沙克尔顿地区地层内的二叠纪-三叠纪边界，并将其与该地区的其他地层序列相关联（例如通过化石植物有机质的稳定碳同位素地层学）。 研究人员将使用多种类型的数据来评估古环境，包括：1）古土壤形态； 2）古土壤地球化学； 3）成土有机质； 4）木材化石年代学和稳定同位素。 南极洲的弗雷莫组保存了整个三叠纪古纬度最高（~70°S）的四足动物群，因此有可能为中生代早期极地生命的演化提供重要线索。 通过骨骼和象牙组织学生长分析，将来自南极洲的三叠纪脊椎动物的生物学特性与来自较低古纬度的同种脊椎动物进行比较。 将采用跨学科方法来解决沙克尔顿冰川地区巴克利和弗雷莫地层中保存的高纬度地层背景下的环境变化、动物群组成和生物地理模式之间的关系。