Articles | Volume 11, issue 9
https://doi.org/10.5194/cp-11-1249-2015
https://doi.org/10.5194/cp-11-1249-2015
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, J. Henderiks, F. Tori, S. Monechi, R. Fenero, A. Legarda-Lisarri, and E. Thomas

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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.
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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.