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Dissolution of coccolithophorid calcite by microzooplankton and copepod grazing

Citation

Antia, AN and Suffrian, K and Holste, L and Muller, MN and Nejstgaard, JC and Simonelli, P and Carotenuto, Y and Putzeys, S, Dissolution of coccolithophorid calcite by microzooplankton and copepod grazing, Biogeosciences Discussions, 5, (1) pp. 1-23. ISSN 1810-6277 (2008) [Refereed Article]


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Copyright Statement

Copyright © Author(s) 2008. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

DOI: doi:10.5194/bgd-5-1-2008

Abstract

Independent of the ongoing acidification of surface seawater, the majority of the calcium carbonate produced in the pelagial is dissolved by natural processes above the lysocline. We investigate to what extent grazing and passage of coccolithophorids 5 through the guts of copepods and the food vacuoles of microzooplankton contribute to calcite dissolution. In laboratory experiments where the coccolithophorid Emiliania huxleyi was fed to the rotifer Brachionus plicatilis, the heterotrophic flagellate Oxyrrhis marina and the copepod Acartia tonsa, calcite dissolution rates of 45–55%, 37–53% and 5–22% of ingested calcite were found. We ascribe higher loss rates in microzoo10 plankton food vacuoles as compared to copepod guts to the strongly acidic digestion and the individual packaging of algal cells. In further experiments, specific rates of calcification and calcite dissolution were also measured in natural populations during the PeECE III mesocosm study under differing ambient pCO2 concentrations. Microzooplankton grazing accounted for between 27 and 70% of the dynamic calcite stock 15 being lost per day, with no measurable effect of CO2 treatment. These measured calcite dissolution rates indicate that dissolution of calcite in the guts of microzooplankton and copepods can account for the calcite losses calculated for the global ocean using budget and model estimates.

Item Details

Item Type:Refereed Article
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Biological Oceanography
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Biological Sciences
Author:Muller, MN (Dr Marius Muller)
ID Code:72203
Year Published:2008
Deposited By:IMAS Research and Education Centre
Deposited On:2011-08-23
Last Modified:2012-03-08
Downloads:0

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