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

L. J. De Nooijer, G. Langer, G. Nehrke, J. Bijma

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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. © Author(s) 2009.
    Original languageEnglish
    Pages (from-to)2669-2675
    JournalBiogeosciences
    Volume6
    Issue number11
    DOIs
    Publication statusPublished - 1 Jan 2009

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