Mid Pleistocene foraminiferal mass extinction coupled with phytoplankton evolution

Kender, Sev and McClymont, Erin L. and Elmore, Aurora C. and Emanuele, Dario and Leng, Melanie J. and Elderfield, Henry (2016) Mid Pleistocene foraminiferal mass extinction coupled with phytoplankton evolution. Nature Communications, 7. p. 11970. ISSN 2041-1723 DOI 10.1038/ncomms11970

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Official URL: http://doi.org/10.1038/ncomms11970

Abstract

Understanding the interaction between climate and biotic evolution is crucial for deciphering the sensitivity of life. An enigmatic mass extinction occurred in the deep oceans during the Mid Pleistocene, with a loss of over 100 species (20%) of sea floor calcareous foraminifera. An evolutionarily conservative group, benthic foraminifera often comprise >50% of eukaryote biomass on the deep-ocean floor. Here we test extinction hypotheses (temperature, corrosiveness and productivity) in the Tasman Sea, using geochemistry and micropalaeontology, and find evidence from several globally distributed sites that the extinction was caused by a change in phytoplankton food source. Coccolithophore evolution may have enhanced the seasonal ‘bloom’ nature of primary productivity and fundamentally shifted it towards a more intra-annually variable state at ~0.8 Ma. Our results highlight intra-annual variability as a potential new consideration for Mid Pleistocene global biogeochemical climate models, and imply that deep-sea biota may be sensitive to future changes in productivity.

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: Nature Communications
Volume: 7
Page Range: p. 11970
Identification Number: 10.1038/ncomms11970
Depositing User: Sarah Humbert
Date Deposited: 21 Jun 2016 10:54
Last Modified: 21 Jun 2016 10:54
URI: http://eprints.esc.cam.ac.uk/id/eprint/3669

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