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南極域環境変遷のさらなる理解に向けて : 珪藻および黄金色藻化石研究の現状と課題

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Title: 南極域環境変遷のさらなる理解に向けて : 珪藻および黄金色藻化石研究の現状と課題
Other Titles: For better understanding of the Southern Ocean history using fossil diatoms and chrysophytes
Authors: 須藤, 斎1 Browse this author
加藤, 悠爾2 Browse this author
石野, 沙季3 Browse this author
服部, 圭治4 Browse this author
高橋, 啓伍5 Browse this author
真壁, 竜介6 Browse this author
Authors(alt): Suto, Itsuki1
Kato, Yuji2
Ishino, Saki3
Hattori, Keiji4
Takahashi, Keigo5
Makabe, Ryosuke6
Keywords: 植物プランクトン
paleoceanographic reconstruction
Southern Ocean
Issue Date: 31-Mar-2018
Publisher: 低温科学第76巻編集委員会
Journal Title: 低温科学
Journal Title(alt): Low Temperature Science
Volume: 76
Start Page: 95
End Page: 119
Abstract: 有孔虫や珪藻をはじめとする動植物プランクトンの遺骸は様々な堆積物中から化石として発見される.これらは微化石と呼ばれ,地層が堆積した年代や過去の環境を知る手掛かりとなり,南大洋域においても,海底堆積物から産出する微化石を用いた古海洋学的研究が続けられてきた.しかし,そのアクセスの困難さから,海洋プランクトンの詳細な生態は完全には分かっておらず,古環境復元を行うための情報は不足している.また,化石化過程や,堆積中・堆積後にどのような影響を周りの環境から被るのかについての情報は乏しい.さらに,示相化石として用いられている微化石は現生種にほぼ限られており,絶滅種に関する生態情報は皆無に等しい.本稿では,珪藻および黄金色藻化石を用いた南大洋の古環境復元の研究例を中心に紹介しながら,これらの問題点とその解決への糸口を議論する.
The hard parts, such as calcareous shell and siliceous valve, of the zoo- and phytoplankton including foraminifers and diatoms are preserved in sediments as microfossil. They have been used to know the sedimentary ages and paleoenvironment. In the Southern Ocean, several paleoceanographic studies have been continued using microfossils from the sediments. However, detailed ecological preference of the marine plankton, which is essential for paleoenvironmental reconstruction, has not completely clarified yet, due to the difficulty of gaining access to the Southern Ocean. In addition, their taphonomy (i.e., what kind of influence suffers them during sedimentation and fossilization) is still poorly understood. Furthermore, there is little ecological information on the extinct species, which preclude their use as facies fossils. In this paper, we review recent results of the paleoenvironmental reconstruction in the Southern Ocean using fossil diatoms and chrysophytes, and then discuss several problems of paleontological/paleoceanographic studies.
Type: bulletin (article)
Appears in Collections:低温科学 = Low Temperature Science > 第76巻

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