The variable ambient ph during chamber formation process of benthic foraminifera

Takashi Toyofuku

Presentation information

International Session (Oral)

Symbol B (Biogeosciences) » B-PT Paleontology

[B-PT03] Biomineralization and the Geochemistry of Proxies -Field ecology, Laboratory culture and Paleo

Sun. May 22, 2016 9:00 AM - 10:30 AM 101B (1F)

Convener:*Takashi Toyofuku(Japan Agency for Marine-Earth Science and Technology (JAMSTEC)), Hiroshi Kitazato(Institute of Biogeosciences (BioGeos),Japan Agency for Marine-Earth Science and Technology (JAMSTEC)), Jelle Bijma(Alfred-Wegener-Institut fur Polar- und Meeresforschung), Simon Redfern(University of Cambridge), Chair:Hiroshi Kitazato(Institute of Biogeosciences (BioGeos),Japan Agency for Marine-Earth Science and Technology (JAMSTEC))

9:15 AM - 9:30 AM

[BPT03-02] The variable ambient ph during chamber formation process of benthic foraminifera

*Takashi Toyofuku¹ (1.Japan Agency for Marine-Earth Science and Technology (JAMSTEC))

Keywords:Foraminifera, Calcification

Some of major studies recently showed that calcifying marine organisms respond differently to ocean acidification (OA). Prediction of OA impact is getting tangled by this variability. Moreover, this complicates modelling future ecological cycles. Carbon usage is key to understanding calcification and hence understanding impact of OA. Using fluorescent techniques to visualize pH gradients, this shows foraminifera actively pump protons to promote passive CO2 uptake. This appearance the basis of calcification and effectively support carbon uptake independent from seawater pH. The resulting fundamentally new calcification model has major implications for understanding past changes in atmospheric CO2 as well for predicting future CO2.