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A marked switch in the abundance of the planktic foraminiferal generaMorozovella and Acarinina occurred at low-latitude sitesnear the start of the Early Eocene Climatic Optimum (EECO), amulti-million-year interval when Earth surface temperatures reached theirCenozoic maximum. Stable carbon and oxygen isotope data of bulk sediment arepresented from across the EECO at two locations: Possagno in northeast Italyand Deep Sea Drilling Project (DSDP) Site 577 in the northwest Pacific.Relative abundances of planktic foraminifera are presented from these twolocations, as well as from Ocean Drilling Program (ODP) Site 1051 in thenorthwest Atlantic. All three sections have good stratigraphic markers, andthe δ13C records at each section can be correlated amongst eachother and to δ13C records at other locations across the globe.These records show that a series of negative carbon isotope excursions (CIEs)occurred before, during and across the EECO, which is defined here as theinterval between the J event and the base of Discoastersublodoensis. Significant though ephemeral modifications in plankticforaminiferal assemblages coincide with some of the short-term CIEs, whichwere marked by increases in the relative abundance of Acarinina,similar to what happened across established hyperthermal events in Tethyansettings prior to the EECO. Most crucially, a temporal link exists betweenthe onset of the EECO, carbon cycle changes during this time and the declinein Morozovella. Possible causes are manifold and may includetemperature effects on photosymbiont-bearing planktic foraminifera andchanges in ocean chemistry

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