Changes in marine-plankton diatom assemblages due to formation and development of Circum-Antarctic Current

环南极流形成和发展导致海洋浮游生物硅藻组合的变化

基本信息

批准号：
09839042
负责人：
TANIMURA Yoshihiro
金额：
$ 2.18万
依托单位：
National Science Museum
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09839042/
关键词：
marine plankton Circum-Antarctic Current diatoms 南極還流

项目摘要

A time series of 65 sediment trap samples deployed in the western North Pacific Ocean, representing 48-month changes in diatom flora, seven DSDP (Deep Sea Drilling Program) cores from the Ocean, and 20 sea water and sea-ice samples from Lutzow-Holm Bay of Antarctica were analyzed.Temporal and spatial distribution of a single cosmopolitan diatom species, Thalassionema nitzschioides, and its varieties were found to be linked with the history of differentiation and distribution surface water masses due to changes in the ocean circulation system.In DSDP-ODP (Ocean Drilling Program) cores, T.nitzschioides is common in all late Paleogene to Quaternary sequences but not in cores from modern high-latitude Antarctic seas, over which Circum-Antarctic Current flows. Temporal variations of diatom abundance and species composition at Ocean Drilling Program Site 1095 cored on the continental rise along the Pacific side of Antarctic Peninsula were used to investigate the history of Polar Front migrations. The increases in abundance of T.nitzschioides at 5.7, 5.2-4.7 and 4.4-3.7 Ma, suggest a migration of Polar Front or Antarctic Convergence, a major boundary of plankton provinces in the modern Southern Ocean, to this site.These results suggest that temporal and spatial distribution of T.nitzschioides and its varieties is a new proxy for delineating the evolution of plankton provinces in relation to changes in distribution of surface water masses in the geologic past.

一个时间序列由65个沉积物陷阱样品部署在西部西部太平洋，代表了硅藻菌群的48个月变化，来自海洋的7个DSDP（深海钻井程序）以及20个海水和海冰样品，来自南极的lutzow-holm bay，分析了thran distom diatan distom didan distom didan distom cosmopolitan distom didan distom didan distom cosmopolitan distom cosmopolitan distom cosmopolitan nitzschioides, and its varieties were found to be linked with the history of differentiation and distribution surface water masses due to changes in the ocean circulation system.In DSDP-ODP (Ocean Drilling Program) cores, T.nitzschioides is common in all late Paleogene to Quaternary sequences but not in cores from modern high-latitude Antarctic seas, over which Circum-Antarctic Current flows.海洋钻井程序地点的硅藻丰度和物种组成的时间变化1095在南极半岛太平洋沿岸的大陆升起上进行了研究，以研究极地前迁移的历史。在5.7、5.2-4.7和4.4-3.7 MA处的北耐剂量的增加表明，极性前部或南极融合的迁移，这是现代南大洋浮游生物的主要边界，这是该地点的主要边界。与地质过去的地表水质量分布的变化有关。