Co-evolution of phytoplankton dynamics and environment at the Fram Strait

弗拉姆海峡浮游植物动态与环境的协同演化

基本信息

批准号：
NE/Z000300/1
负责人：
Rosalind Emily Mayors Rickaby
金额：
$ 6.53万
依托单位：
University of Oxford
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2024
资助国家：
英国
起止时间：
2024 至无数据
项目状态：
未结题

来源：
https://gtr.ukri.org/projects?ref=NE%2FZ000300%2F1
关键词：
Co evolution phytoplankton dynamics environment

项目摘要

The geological record provides hints at a link between the variations in the shape of the Earth's orbit and pulses of evolution or adaptation of marine calcifying phytoplankton (i.e., coccolithophores) during the last 2 Ma of Earth's history. These pulses are expressed as a reduction in diversity and increased proliferation of certain morphotypes belonging to the Noelaerhabdaceae family, recorded almost ubiquitously in sedimentary sequences ranging from low to high-mid latitudes of the global ocean. Such eccentricity-forced changes in the biological pump and the production and export of carbon by phytoplankton populations could be an important mediator between orbital forcing and the global carbon cycle, possibly modifying the geochemistry of the global ocean reservoir by accelerating deep dissolution processes. To test whether this dynamic occurs consistently in time and across all latitudes, observations at high latitudinal extremes, where the involvement of siliceous phytoplankton populations could be susceptible to the forcing, are critically required. Applying an innovative combination of micropaleontological, geochemical and image analysis techniques on nannofossil assemblages over selected intervals from the sediments retrieved during Expedition 403, with a sampling of sufficient resolution for orbital scale features, we aim to characterise the patterns of variability of phytoplankton populations (amount and diversity) and net production and export of carbon through time. This will provide critical notions to elucidate the co-evolution of phytoplankton dynamics and environment at the Fram Strait, its drivers and feedbacks on the regional production of carbon and a plausible connection with the global content.

地质记录提供了暗示地球轨道形状的变化与在地球历史的最后2 MA中的钙化浮游植物（即，cococcolithophores）的进化或适应性脉冲之间的联系之间的联系。这些脉冲表示是降低多样性的降低和属于Noelaerahabdaceae家族的某些形态型的增殖，几乎无处不在的沉积序列，范围从全球海洋的低到中高纬度。这种偏心型生物泵的变化以及浮游植物种群的碳的产生和出口可能是轨道强迫与全球碳循环之间的重要中介，可能会通过加速深层溶解过程来改变全球海洋储层的地球化学。为了测试这种动态是否在时间和所有纬度上始终发生，在高纬度极端的观察中，硅质浮游植物种群的参与可能会受到强迫的影响。 Applying an innovative combination of micropaleontological, geochemical and image analysis techniques on nannofossil assemblages over selected intervals from the sediments retrieved during Expedition 403, with a sampling of sufficient resolution for orbital scale features, we aim to characterise the patterns of variability of phytoplankton populations (amount and diversity) and net production and export of carbon through time.这将提供关键的概念，以阐明弗拉姆海峡浮游植物动力学和环境的共同发展，其驱动因素和有关碳区域生产的反馈以及与全球内容的合理联系。