Calcification response of a key phytoplankton family to millennial-scale environmental change

McClelland, H. L. O. and Barbarin, N. and Beaufort, L. and Hermoso, M. and Ferretti, P. and Greaves, M. J. and Rickaby, R. E. M. (2016) Calcification response of a key phytoplankton family to millennial-scale environmental change. Scientific Reports, 6 (34263). ISSN 2045-2322 DOI 10.1038/srep34263

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Official URL: http://doi.org/10.1038/srep34263

Abstract

Coccolithophores are single-celled photosynthesizing marine algae, responsible for half of the calcification in the surface ocean, and exert a strong influence on the distribution of carbon among global reservoirs, and thus Earth’s climate. Calcification in the surface ocean decreases the buffering capacity of seawater for CO2, whilst photosynthetic carbon fixation has the opposite effect. Experiments in culture have suggested that coccolithophore calcification decreases under high CO2 concentrations ([CO2(aq)]) constituting a negative feedback. However, the extent to which these results are representative of natural populations, and of the response over more than a few hundred generations is unclear. Here we describe and apply a novel rationale for size-normalizing the mass of the calcite plates produced by the most abundant family of coccolithophores, the Noëlaerhabdaceae. On average, ancient populations subjected to coupled gradual increases in [CO2(aq)] and temperature over a few million generations in a natural environment become relatively more highly calcified, implying a positive climatic feedback. We hypothesize that this is the result of selection manifest in natural populations over millennial timescales, so has necessarily eluded laboratory experiments.

Item Type: Article
Uncontrolled Keywords: 2016AREP; IA70,
Subjects: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Divisions: 01 - Climate Change and Earth-Ocean Atmosphere Systems
07 - Gold Open Access
Journal or Publication Title: Scientific Reports
Volume: 6
Identification Number: 10.1038/srep34263
Depositing User: Sarah Humbert
Date Deposited: 27 Jul 2017 17:28
Last Modified: 27 Jul 2017 17:28
URI: http://eprints.esc.cam.ac.uk/id/eprint/4008

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