Reconstructing Late Pleistocene ecology, environment and climate using bulk and compound specific isotope measurements of megafauna

利用巨型动物群的大量和复合特定同位素测量重建晚更新世生态、环境和气候

• 批准号: RGPIN-2021-03678
• 负责人: Richards, Michael
• 金额: $ 3.13万
• 依托单位: Simon Fraser University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=743814
• 关键词: Reconstructing; Late; Pleistocene; ecology; environment

The Late Pleistocene of British Columbia, specifically dating from 50,000 to 20,000 years ago, has generally been defined as a period where much, if not all of the province was covered with glacial ice. Recent studies of refugia plant communities, and a number of radiocarbon dates on animal remains (megafauna such as mammoths) has suggested that the glacial history of the province is more complex. This project will seek to better understand the past ecology and climate of British Columbia during this period through the isotopic analysis of megafauna (especially mammoth) from throughout the province. We have identified many new mammoth specimens in our pilot study for this project and have some preliminary radiocarbon dates that places the mammoths at time clusters of 35,000 and 20,000 years ago. In collaborations with many museums throughout the province, as well as with the Royal British Columbia museum and universities, we will sample the newly identified (more than 50) mammoth remains to determine their ages with radiocarbon dating. Then we will apply an in-depth analysis of the remains to determine the climate and ecological conditions when they were living in different parts of the province. This analysis involves isotope measurements of the remains to look at the diets of these mammoths (carbon, nitrogen, including individual amino acids) and their migration patterns (oxygen). We have permission to sample over 50 mammoths from more than 20 museums and universities around the province. All of the isotope analysis will be undertaken in the isotope research lab at the Faculty of the Environment at Simon Fraser University. We are especially interested in how dietary adaptations and migration patterns changed throughout this time period. Then we will use this data to help us reconstruct the climate and ecology of where the mammoths were living, using a multi-isotope method of climate and ecological reconstruction of animal remains that we have developed in our laboratory, to better help us understand the changing ecology and climate of British Columbia over a 30,000 year time period.

不列颠哥伦比亚省的晚更新世，特别是从50，000到20，000年前，通常被定义为一个时期，如果不是所有的省份都被冰川冰覆盖。最近对避难所植物群落的研究以及对动物遗骸（猛犸象等巨型动物）的放射性碳测年表明，该省的冰川历史更加复杂。 该项目将通过对全省的巨型动物（特别是猛犸）进行同位素分析，力求更好地了解这一时期不列颠哥伦比亚省过去的生态和气候。我们在这个项目的试点研究中发现了许多新的猛犸标本，并有一些初步的放射性碳年代测定，将猛犸象定位在35,000年和20,000年前的时间簇中。在与全省许多博物馆以及皇家不列颠哥伦比亚省博物馆和大学的合作中，我们将对新发现的（50多个）猛犸遗骸进行取样，以放射性碳测年法确定它们的年龄。然后，我们将对遗骸进行深入分析，以确定他们在该省不同地区生活时的气候和生态条件。这项分析涉及对遗骸的同位素测量，以了解这些猛犸象的饮食（碳，氮，包括单个氨基酸）及其迁移模式（氧）。 我们获准从全省20多个博物馆和大学采集50多只猛犸象的样本。所有同位素分析将在西蒙弗雷泽大学环境学院的同位素研究实验室进行。 我们特别感兴趣的是在这段时间内饮食适应和迁移模式是如何变化的。然后，我们将利用这些数据来帮助我们重建猛犸象生活的气候和生态，使用我们在实验室开发的气候和动物遗骸生态重建的多同位素方法，以更好地帮助我们了解不列颠哥伦比亚省在3万年时间内不断变化的生态和气候。