Calcium carbonate precipitation induced by the growth of the marine cyanobacteria Trichodesmium

Kranz, Sven A., Wolf-Gladrow, Dieter, Nehrke, Gernot, Langer, Gerald and Rost, Bjørn (2010) Calcium carbonate precipitation induced by the growth of the marine cyanobacteria Trichodesmium Limnology and Oceanography, 55 (6). pp. 2563-2569. DOI 10.4319/lo.2010.55.6.2563.

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Abstract

In this laboratory study, we monitored the buildup of biomass and concomitant shift in seawater carbonate chemistry over the course of a Trichodesmium bloom under different phosphorus (P) availability. During exponential growth, dissolved inorganic carbon (DIC) decreased, while pH increased until maximum cell densities were reached. Once P became depleted, DIC decreased even further and total alkalinity (TA) dropped, accompanied by precipitation of aragonite. Under P-replete conditions, DIC increased and TA remained constant in the postbloom phase. A diffusion-reaction model was employed to estimate changes in carbonate chemistry of the diffusive boundary layer. This study demonstrates that Trichodesmium can induce precipitation of aragonite from seawater and further provides possible explanations about underlying mechanisms.

Document Type: Article
Keywords: NITROGEN-FIXATION; CRYSTAL-GROWTH; NORTH-ATLANTIC; CELL-DEATH; PHYTOPLANKTON; SEAWATER; OCEAN; SPP.; PH; CALCIFICATION
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.4319/lo.2010.55.6.2563
ISSN: 0024-3590
Projects: BIOACID
Date Deposited: 07 Nov 2012 07:14
Last Modified: 30 Jan 2014 13:43
URI: http://oceanrep.geomar.de/id/eprint/19120

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