Physiological controls on seawater uptake and calcification in the benthic foraminifer Ammonia tepida

de Nooijer, L. J. and Langer, G. and Nehrke, G. and Bijma, J. (2009) Physiological controls on seawater uptake and calcification in the benthic foraminifer Ammonia tepida. Biogeosciences, 6 (11). pp. 2669-2675. ISSN 1726-4189 DOI 10.5194/bg-6-2669-2009

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Abstract

To analyze the relation between seawater uptake and calcification, we incubated juveniles of the benthic foraminifer Ammonia tepida with various fluorescent probes and visualised them afterwards with confocal laser scanning microscopy. Vesicle membranes, Ca ions and vacuole fluids were followed with various tracers and showed for the first time that endocytosis of seawater is part of the calcification process in Ammonia tepida. Data on the intracellular Ca ion cycling allowed for calculating a preliminary cellular Ca budget during foraminiferal calcification. This showed that the free calcium involved in the production of a new chamber cannot be sufficient and suggests that foraminifera may precipitate their calcite from an amorphous precursor.

Item Type:	Article
Uncontrolled Keywords:	NILAREP
Subjects:	01 - Climate Change and Earth-Ocean Atmosphere Systems
Divisions:	01 - Climate Change and Earth-Ocean Atmosphere Systems
Journal or Publication Title:	Biogeosciences
Volume:	6
Page Range:	pp. 2669-2675
Identification Number:	10.5194/bg-6-2669-2009
Depositing User:	Sarah Humbert
Date Deposited:	05 May 2012 12:04
Last Modified:	23 Jul 2013 10:04
URI:	http://eprints.esc.cam.ac.uk/id/eprint/2502

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