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| Titel |
Physiological controls on seawater uptake and calcification in the benthic foraminifer Ammonia tepida |
| VerfasserIn |
L. J. Nooijer, G. Langer, G. Nehrke, J. Bijma |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 6, no. 11 ; Nr. 6, no. 11 (2009-11-27), S.2669-2675 |
| Datensatznummer |
250004101
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| Publikation (Nr.) |
 copernicus.org/bg-6-2669-2009.pdf |
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| Zusammenfassung |
| 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. |
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