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  Environmental controls on calcification of phytoplankton from the geological record


   Department of Earth Sciences

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  Prof Ross Rickaby, Dr Alba Gonzalez-Lanchas  No more applications being accepted  Competition Funded PhD Project (Students Worldwide)

About the Project

Why are the oceans supersaturated with respect to calcium carbonate? Foraminifera and coccolithophores generate over 2 billion tonnes of carbonate/yr1 but what limits this production? Our lack of understanding of the response of pelagic calcification to environmental change hinders any predictions of the future ocean carbon cycle and ecosystem. The main objective of this project is to bring together a physiological model of C with innovative stable isotopic approaches applied to the natural laboratory of the geological record to identify the environmental parameters that trigger the highest pelagic adapted calcification efficiency in the modern and Cenozoic ocean. Find more information here.

Environmental Sciences (13) Geology (18)

Funding Notes

There is a single ERC-Department studentship available for this project. The studentship would be 3 years duration in the first instance, with the possibility of extension to 4 years. It includes fees at the home rate, stipend, travel and research funds, and is available to UK and overseas students; the studentship does not cover the difference between the home and overseas fee rates.
Please only apply via https://www.ox.ac.uk/admissions/graduate. Do not send us your CV via email.

References

References & Further Reading
LM Claxton, HLO McClelland, M Hermoso, REM Rickaby, Eocene emergence of highly calcifying coccolithophores despite declining atmospheric CO2, Nature Geoscience, 1-6
Hermoso, M, McClelland, H.-L.O., Hirst, J.S., Minoletti, F., Bonifacie, M., Rickaby, R.E.M. Towards the use of the coccolith vital effects in palaeoceanography: A field investigation during the middle Miocene in the SW Pacific Ocean, Deep-Sea Research Part I, 160, Art. No. 103262, 2020
Si, W. and Rosenthal, Y., (2019). Reduced continental weathering and marine calcification linked to late Neogene decline in atmospheric CO2. Nature Geoscience. https://doi.org/10.1038/s41561-019-0450-3
McClelland H. L. O., J. Bruggeman, M. Hermoso & R. E. M. Rickaby, The origin of carbon isotope vital effects in coccolith calcite, Nat Comms, DOI: 10.1038/ncomms14511, 2017
Lee, R. B. Y., Mavridou, D., Papdakos,G., McLelland, H. L. O., and R. E. M. Rickaby, The Uronic acid content of coccolith associated polysaccharide provides insights into evolving coccolithogenesis and climate, Nat. Comms, doi:10.1038/ncomms13144, 2016.
Rickaby, R. E. M., J. Henderiks, and J. N. Young, Perturbing phytoplankton: response and isotopic fractionation with changing carbonate chemistry in two coccolithophore species, Clim. Past, 6, 771- 785, 2010