Effects of changes in carbonate chemistry speciation on Coccolithus braarudii: a discussion of coccolithophorid sensitivities

Krug, Sebastian, Schulz, Kai and Riebesell, Ulf (2011) Effects of changes in carbonate chemistry speciation on Coccolithus braarudii: a discussion of coccolithophorid sensitivities Biogeosciences (BG), 8 . pp. 771-777. DOI 10.5194/bg-8-771-2011.

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Abstract

Ocean acidification and associated shifts in carbonate chemistry speciation induced by increasing levels of atmospheric carbon dioxide (CO2) have the potential to impact marine biota in various ways. The process of biogenic calcification, for instance, is usually shown to be negatively affected. In coccolithophores, an important group of pelagic calcifiers, changes in cellular calcification rates in response to changing ocean carbonate chemistry appear to differ among species. By applying a wider CO2 range we show that a species previously reported insensitive to seawater acidification, Coccolithus braarudii, responds both in terms of calcification and photosynthesis, although at higher levels of CO2. Thus, observed differences between species seem to be related to individual sensitivities while the underlying mechanisms could be the same. On this basis we develop a conceptual model of coccolithophorid calcification and photosynthesis in response to CO2-induced changes in seawater carbonate chemistry speciation.

Document Type: Article
Funder compliance: info:eu-repo/grantAgreement/EC/FP7/211384
Additional Information: WOS:000288911300017
Keywords: Marine Biology; ocean acidification; coccolithus braarudii; EMILIANIA-HUXLEYI PRYMNESIOPHYCEAE; DISSOLVED INORGANIC CARBON; TOTAL ALKALINITY; SEAWATER; CO2; CALCIFICATION; PHYTOPLANKTON; DISSOCIATION; ACQUISITION; CONSTANTS
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-BI Biological Oceanography
Refereed: Yes
DOI etc.: 10.5194/bg-8-771-2011
ISSN: 1726-4170
Related URLs:
Projects: BIOACID, EPOCA
Date Deposited: 06 Dec 2010 09:20
Last Modified: 09 Nov 2012 13:39
URI: http://oceanrep.geomar.de/id/eprint/10309

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