Climate change-driven extinction in planktonic foraminifera
气候变化导致浮游有孔虫灭绝
基本信息
- 批准号:2292922
- 负责人:
- 金额:--
- 依托单位:
- 依托单位国家:英国
- 项目类别:Studentship
- 财政年份:2019
- 资助国家:英国
- 起止时间:2019 至 无数据
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Ongoing declines in biodiversity call for accurate predictions of extinction risk arising from climate change. Long-term studies of evolutionary response to climate change require investigation of the fossil record, but very few fossil records allow us to make highly resolved reconstructions of evolution. The exceptionally well-preserved fossil record of planktonic foraminifera, an abundant and wide-spread group of marine zooplankton, allows for detailed analyses of evolutionary change across diverse environmental settings and climate states. Planktonic foraminifera diversity has decreased steadily over the past 5 million years [1,2]. Over this interval Earth's climate transitioned from a warm distinctly unipolar (Antarctic) glacial climate state to become cold enough to support large ice polar sheets in both hemispheres; initially during ~41 thousand year (kyr)-paced glacial cycles, eventually during the large ~100 kyr-paced Ice Age cycles [3]. It is widely suggested that climate played a role in this decline in diversity, but the causes of individual extinctions remain unknown. This project will study all 46 extinctions of planktonic foraminifera species in the past 5 million years in order to investigate common driving mechanisms and early warning signals. Changes in shell size and shape of extinct-going and surviving species will be compared to local records of environmental change using multivariate statistical techniques [4] to test for threshold response behaviour to climate change-forcing.
生物多样性的持续下降要求准确预测气候变化引起的灭绝风险。长期研究进化对气候变化的反应需要调查化石记录,但很少有化石记录能让我们对进化进行高分辨率的重建。浮游有孔虫是一种数量丰富、分布广泛的海洋浮游动物,其化石记录保存极为完好,因此可以对不同环境和气候状态下的进化变化进行详细分析。 浮游有孔虫的多样性在过去的500万年里稳步下降[1,2]。在这段时间里,地球的气候从一个温暖的明显的单极(南极)冰川气候状态转变为足够冷,以支持两个半球的大型冰极地表;最初在约41万年(kyr)的冰川周期中,最终在大的约100 kyr的冰河时代周期中[3]。人们普遍认为,气候在这种多样性下降中发挥了作用,但个体灭绝的原因仍然未知。 该项目将研究过去500万年来所有46个浮游有孔虫物种的灭绝,以调查共同的驱动机制和早期预警信号。将使用多元统计技术[4]将不稳定和存活物种的壳大小和形状的变化与当地的环境变化记录进行比较,以测试对气候变化强迫的阈值响应行为。
项目成果
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