Articles | Volume 12, issue 4
Clim. Past, 12, 981–1007, 2016

Special issue: Climatic and biotic events of the Paleogene

Clim. Past, 12, 981–1007, 2016

Research article 15 Apr 2016

Research article | 15 Apr 2016

Major perturbations in the global carbon cycle and photosymbiont-bearing planktic foraminifera during the early Eocene

Valeria Luciani et al.

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Cited articles

Abels, H. A., Clyde, W. C., Gingerich, P. D., Hilgen, F. J., Fricke, H. C., Bowen, G. J., and Lourens, L. J.: Terrestrial carbon isotope excursions and biotic change during Palaeogene hyperthermals, Nat. Geosci., 5, 326–329,, 2012.
Agnini, C., Muttoni, G., Kent, D. V., and Rio, D.: Eocene biostratigraphy and magnetic stratigraphy from Possagno, Italy: the calcareous nannofossils response to climate variability, Earth Planet. Sc. Lett., 241, 815–830, 2006.
Agnini, C., Macrì, P., Backman, J., Brinkhuis, H., Fornaciari, E., Giusberti, L., Luciani, V., Rio, D., Sluijs, A., and Speranza, F.: An early Eocene carbon cycle perturbation at  ∼  52.5 Ma in the Southern Alps: chronology and biotic response, Paleoceanography, 24, PA2209,, 2009.
Agnini, C., Fornaciari, E., Raffi, I., Catanzariti, R., Pälike, H., Backman, J., and Rio, D.: Biozonation and biochronology of Paleogene calcareous nannofossils from low to middle latitudes, Newsl. Strat., 47, 131–181, 2014.
Agnini, C., Spofforth, D. J. A., Dickens, G. R., Rio, D., Pälike, H., Backman, J., Muttoni, G., and Dallanave, E.: Stable isotope and calcareous nannofossil assemblage record of the late Paleocene and early Eocene (Cicogna section), Clim. Past, 12, 883–909,, 2016.
Short summary
The symbiont-bearing planktic foraminiferal genera Morozovella and Acarinina were among the most important calcifiers of the early Paleogene tropical and subtropical oceans. However, a remarkable and permanent switch in the relative abundance of these genera happened in the early Eocene. We show that this switch occurred at low-latitude sites near the start of the Early Eocene Climatic Optimum (EECO), a multi-million-year interval when Earth surface temperatures reached their Cenozoic maximum.