Articles | Volume 11, issue 9
Clim. Past, 11, 1249–1270, 2015

Special issue: Climatic and biotic events of the Paleogene

Clim. Past, 11, 1249–1270, 2015

Research article 30 Sep 2015

Research article | 30 Sep 2015

Microfossil evidence for trophic changes during the Eocene–Oligocene transition in the South Atlantic (ODP Site 1263, Walvis Ridge)

M. Bordiga et al.

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Cited articles

Adams, C. G., Butterlin, J., and Samanta, B. K.: Larger foraminifera and events at the Eocene-Oligocene boundary in the Indo–West Pacific region, in: Terminal Eocene Events, edited by: Pomerol, C. and Premoli Silva, I., Elsevier, Amsterdam, 237–252, 1986.
Adler, M., Hensen, C., Wenzhöfer, F., Pfeifer, K., and Schulz, H. D.: Modelling of calcite dissolution by oxic respiration in supralysoclinal deep-sea sediments, Mar. Geol., 177, 167–189, 2001.
Agnini, C., Fornaciari, E., Rio, D., Tateo, F., Backman, J., and Giusberti, L.: Responses of calcareous nannofossil assemblages, mineralogy and geochemistry to the environmental perturbations across the Paleocene Eocene boundary in the Venetian Pre-Alps, Mar. Micropaleontol., 63, 19–38, 2006.
Agnini, C., Fornaciari, E., Raffi, I., Catanzariti, R., Pälike, H., Backman, J., and Rio, D.: Biozonation and biochronology of Paleogene calcareous nannofossils from low and middle latitudes, Newsletters on Stratigraphy, 47, 131–181, 2014.
Aitchison, J.: The statistical analysis of compositional data. Chapman and Hall, London, 416 pp., 1986.
Short summary
Deep-sea sediments at ODP Site 1263 (Walvis Ridge, South Atlantic) show that marine calcifying algae decreased in abundance and size at the Eocene-Oligocene boundary, when the Earth transitioned from a greenhouse to a more glaciated and cooler climate. This decreased the food supply for benthic foraminifer communities. The plankton rapidly responded to fast-changing conditions, such as seasonal nutrient availability, or to threshold-levels in pCO2, cooling and ocean circulation.