Calcareous nannofossil species richness across the Paleocene-Eocene Thermal Maximum

• Main Authors: Gibbs, Samantha J, Bown, Paul R, Sessa, Jocelyn A, Bralower, Timothy J, Wilson, Paul A
• Format: Other/Unknown Material
• Language: English
• Published: PANGAEA 2006
• Subjects: 113-690; 198-1209; Bass_River_Site; BR; CDRILL; COMPCORE; Composite Core; Core drilling; DRILL; Drilling/drill rig; Joides Resolution; Leg113; Leg174AX; Leg198; North American East Coast; North Pacific Ocean; Ocean Drilling Program; ODP; South Atlantic Ocean; Wilson_Lake; WL; Ocean acidification
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.771929; https://doi.org/10.1594/PANGAEA.771929

The Paleocene-Eocene Thermal Maximum (PETM, ~5 million years ago) was an interval of global warming and ocean acidification attributed to rapid release and oxidation of buried carbon. We show that the onset of the PETM coincided with a prominent increase in the origination and extinction of calcareous phytoplankton. Yet major perturbation of the surface-water saturation state across the PETM was not detrimental to the survival of most calcareous nannoplankton taxa and did not impart a calcification or ecological bias to the pattern of evolutionary turnover. Instead, the rate of environmental change appears to have driven turnover, preferentially affecting rare taxa living close to their viable limits.