南极普里兹湾放射虫对近现代海洋环境变化的生态响应

As a significant index of marine environmental change in polar ocean, Radiolarian play an irreplaceable role in dipolar region. However, Radiolarian in the Southern Ocean, especially in the Prydz Bay, has not been studied as intensively as that in Arctic. In this project, based on the research data of sediment trap samples we have, and combined with the modern marine environmental parameters and marine records of climate change during the past hundreds of years, Radiolarian in the sediment traps, surface sediments and sediment cores, which collected from the Prydz Bay during 18th -31th CHINARE cruise, will be investigated. Three scientific objectives of this study are: (1) to investigate the radiolarian flux and species composition, and their seasonal-annual variations in relation to the modern marine environmental conditions in water covered by seasonal sea ice, (2) to define the composition and distribution of radiolarian in surface sediments, and their connections with modern physical environments, (3) distinguish the evolution of radiolarian assembly in this area in relation to marine environmental changes during the past hundreds of years in the Southern Ocean. The results of the study will account for the ecological-response principles of Radiolarian to modern marine environmental changes in the Southern Ocean. These achievements will be expected to promote the radiolarian research in the Prydz Bay and the Southern Ocean, and support the applicability of Radiolarian in the study of paleoceanography and even global climate change in the future.

放射虫是极地海洋环境变化研究的重要指标之一，在两极高纬海区具有不可替代的作用，但与北极地区相比，南大洋的放射虫研究却并不深入。本项目选取我国南极科学考察在普里兹湾获取的沉降颗粒物样品、表层沉积物和沉积物岩芯样品，基于已获得的研究资料、结合现代海洋环境参数和百年尺度的海洋环境变化记录，开展放射虫的鉴定和统计工作，以查明季节性海冰覆盖海域水体中放射虫的沉降通量和组合特征的季节-年际变化及其与现代海洋环境参数的关系，澄清该海域现代沉积物中放射虫的空间分布特征及其与现代海洋学条件的内在联系，探讨研究区近现代以来放射虫的种群演变及其与百年尺度极地海洋环境变化的关联。期望通过上述工作的开展，揭示该海域放射虫对近现代极地海洋环境变化的生态响应规律，并进一步探讨其环境控制因素，以此推动该海域乃至南大洋的放射虫研究，为下一步将放射虫应用于南大洋古海洋学研究乃至全球气候变化研究提供可靠的判别依据。

放射虫是极地海洋环境变化研究的重要指标之一，在两极高纬海区具有不可替代的作用，但在南极普里兹湾及其邻近海域却并不深入。本项目选取我国南极科学考察在普里兹湾获取的水体沉降颗粒物样品和沉积物样品，基于已获得的研究资料、结合现代海洋环境参数和百年尺度的海洋环境变化记录，我们聚焦于季节性海冰覆盖海域水体中放射虫的沉降通量和组合特征的季节性变化及其对现代海洋环境的生态响应，以及研究区表层沉积物中放射虫的空间分布特征及其与现代海洋环境的内在联系；同时，结合气候环境变化的历史资料，探讨了多管沉积物中的放射虫在百年尺度上属种组合的演变及其古海洋学意义。上述工作及成果有助于推动该区的放射虫研究，并为下一步将放射虫应用于南大洋古海洋学研究乃至全球气候变化研究提供可靠的判别依据。