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Perturbing phytoplankton: a tale of isotopic fractionation in two coccolithophore species
Dept. of Earth Sciences, Oxford University, UK.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Palaeobiology.
2010 (English)In: Climate of the Past Discussions, ISSN 1814-9359, Vol. 6, p. 257-294Article in journal (Other academic) Published
Abstract [en]

No two species of coccolithophore appear to respond to perturbations of carbonate chemistry in the same way. Here, we show that the degree of malformation, growth rate and stable isotopic composition of organic matter and carbonate produced by two contrasting species of coccolithophore (Gephyrocapsa oceanica and Coccolithus pelagicus ssp. braarudii) are indicative of differences between their photosynthetic and calcification response to changing dissolved inorganic carbon (DIC) levels (ranging from ~1100 to ~7800 μmol kg−1) at constant pH (8.13±0.02). G. oceanica thrived under all conditions of DIC, showing evidence of increased growth rates at higher DIC, but C. braarudii was detrimentally affected at high DIC showing signs of malformation, and decreased growth rates. The carbon isotopic fractionation into organic matter and the coccoliths suggests that C. braarudii utilises a common internal pool of carbon for calcification and photosynthesis but G. oceanica relies on independent supplies for each process. All coccolithophores appear to utilize bicarbonate as their ultimate source of carbon for calcification resulting in the release of a proton. But, we suggest that this proton can be harnessed to enhance the supply of aqueous dissolved carbon dioxide (CO2(aq)) for photosynthesis either from a large internal bicarbonate ion (HCO3-) pool which acts as a pH buffer (C. braarudii), or pumped externally to aid the diffusive supply of CO2 across the membrane from the abundant HCO3- (G. oceanica), likely mediated by an internal and external carbonic anhydrase, respectively. Our simplified hypothetical spectrum of physiologies may provide a context to understand different species response to changing pH and DIC, the species-specific εp and calcite "vital effects", as well as accounting for geological trends in coccolithophore cell size.

Place, publisher, year, edition, pages
Copernicus Publications on behalf of the European Geosciences Union , 2010. Vol. 6, p. 257-294
National Category
Geology
Research subject
Earth Science with specialization in Historical Geology and Palaeontology
Identifiers
URN: urn:nbn:se:uu:diva-135975DOI: 10.5194/cpd-6-257-2010OAI: oai:DiVA.org:uu-135975DiVA, id: diva2:375894
Funder
Swedish Research Council, VR621-2003-3614
Note

Manuscript published in Open Access Journal, using open review system. Two reviews of the ms are public, and the response by authors is published online as well.

Available from: 2010-12-10 Created: 2010-12-09 Last updated: 2014-03-21Bibliographically approved

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Publisher's full texthttp://www.clim-past-discuss.net/6/257/2010/

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