日本地球惑星科学連合2018年大会

講演情報

[EE] 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] バイオミネラリゼーションと環境指標

2018年5月20日(日) 10:45 〜 12:15 ポスター会場 (幕張メッセ国際展示場 7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、共同)、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] Test density of Ammonia sp. under variable pH

*豊福 高志1長井 裕季子3木元 克典1佐々木 理2 (1.海洋研究開発機構、2.東北大学、3.横浜国立大学)

キーワード:有孔虫、石灰化、MXCT

Foraminifera is major calcium carbonate producer in the sea (Langer et al., 1992, 1997? Sciebel et al., 2002). Ocean acidification is a threat on the marine organisms. The influence of ocean acidification on the calcareous foraminifera is the interesting topic for marine science community. Here, we try to measure test density (i.e. CT value) of cultured benthic foraminifera by micro x-ray computer tomography (MXCT). The individuals are grown under different pH settings. The CT value shows relatively lesser variability among experimental settings. It is not statistically significant the chamber size variability nor its increase among variable pH setting, although we also compare the chamber volume and it's increase among the condition. Generally, the size of chamber is increasing with growth at any conditions. The second chamber is smaller than the initial chamber with all individuals. Even the size of chamber increasing with growth from second added chamber, somewhat smaller chamber are added at the beginning of new whole of spiral. When new whole is starting, the older chamber is occupy some part of new chamber even though the outline of the chamber smoothly connected from older one-earlier chamber. This point is different from previous study with planktonic species (Fig. 5 of Sasaki et al., 2016).