日本地球惑星科学連合2019年大会

講演情報

[E] ポスター発表

セッション記号 B (地球生命科学) » B-PT 古生物学・古生態学

[B-PT04] Biomineralization and the Geochemistry of Proxies

2019年5月26日(日) 17:15 〜 18:30 ポスター会場 (幕張メッセ国際展示場 8ホール)

コンビーナ:豊福 高志(国立研究開発法人海洋研究開発機構)、北里 洋(国立大学法人東京海洋大学)、Bijma Jelle(アルフレッドウェゲナー極域海洋研究所)、廣瀬 孝太郎(早稲田大学  大学院創造理工学研究科 地球・環境資源理工学専攻)

[BPT04-P06] Estimation of the calcification rate of foraminifera -exceptionally fast extending of the shell-

*長井 裕季子1,2植松 勝之3豊福 高志2,4 (1.独立行政法人 国立科学博物館、2.国立研究開発法人 海洋研究開発機構、3.マリンワークジャパン、4.東京海洋大学)

キーワード:石灰化、有孔虫、FIB-SEM

The process of biomineralization of foraminiferal test is essential for its characteristic morphogenesis and the composition of element and isotope to be taken in is used also as paleo environmental proxy, numerous studies have been approched to reveal the mechanism of shell formation. However, how fast the foraminifera calicification and how much calcium carbonate deposits depends on the species, which is not well understood in most species.
The foraminifera Spirillina vivipara does not form a chamber, but elongate a tubular test spirally with their cytoplasmic growth. Spirillina vivipara is also known to be rapidly changing generations that can be reproduced in a several days after division of mother cells (Myers, 1936). From our current observations, it was also found that the shell formation is repeatedly carried out in the day, and the elongation rate of the shell is very fast. Therefore, in this study, Spirillina vivipara was used to estimate calcification rate.
In this presentation, we report on the fastest shell extending rate in foraminifera.