JpGU-AGU Joint Meeting 2017

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-PT03] [EE] バイオミネラリゼーションと環境指標

2017年5月20日(土) 10:45 〜 12:15 ポスター会場 (国際展示場 7ホール)

コンビーナ:豊福 高志(独立行政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大学改革準備室)、Bijma Jelle(アルフレッドウェゲナー極域海洋研究所)

[BPT03-P11] Magical Proton Usage on Calcification of Ammonia "beccarii" -Acidify Environment to Realize Favorable pH at Calcification Site-

*豊福 高志1 (1.独立行政法人海洋研究開発機構)

キーワード:Biomineralization, Calcium carbonate, pH

The physiological processes responsible for calcification in foraminifera are poorly understood despite their contribution to oceanic CaCO3 production. Here we show that calcification is driven by rapid transformation of bicarbonate to carbonate inside the cytoplasm, achieved by active outward proton pumping. We furthermore show that a V-type H+ ATPase is responsible for the proton flux and thereby, calcification. External transformation of bicarbonate into CO2 due to the proton pumping implies that biomineralization does not rely on availability of carbonate ions, but total dissolved CO2 in perforate foraminifera.may not reduce calcification, thereby potentially maintaining the current global marine carbonate production.