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The impact of Cenozoic cooling on assemblage diversity in planktonic foraminifera

Fenton, Isabel S., Pearson, Paul Nicholas, Dunkley Jones, Tom, Farnsworth, Alexander, Lunt, Daniel J., Markwick, Paul and Purvis, Andy 2016. The impact of Cenozoic cooling on assemblage diversity in planktonic foraminifera. Philosophical Transactions of the Royal Society of London Series B - Biological Sciences 371 (1691) , 20150224. 10.1098/rstb.2015.0224

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Abstract

The Cenozoic planktonic foraminifera (PF) (calcareous zooplankton) have arguably the most detailed fossil record of any group. The quality of this record allows models of environmental controls on macroecology, developed for Recent assemblages, to be tested on intervals with profoundly different climatic conditions. These analyses shed light on the role of long-term global cooling in establishing the modern latitudinal diversity gradient (LDG)—one of the most powerful generalizations in biogeography and macroecology. Here, we test the transferability of environment-diversity models developed for modern PF assemblages to the Eocene epoch (approx. 56–34 Ma), a time of pronounced global warmth. Environmental variables from global climate models are combined with Recent environment–diversity models to predict Eocene richness gradients, which are then compared with observed patterns. The results indicate the modern LDG—lower richness towards the poles—developed through the Eocene. Three possible causes are suggested for the mismatch between statistical model predictions and data in the Early Eocene: the environmental estimates are inaccurate, the statistical model misses a relevant variable, or the intercorrelations among facets of diversity—e.g. richness, evenness, functional diversity—have changed over geological time. By the Late Eocene, environment–diversity relationships were much more similar to those found today.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Earth and Ocean Sciences
Publisher: Royal Society
ISSN: 0962-8436
Date of First Compliant Deposit: 30 March 2016
Date of Acceptance: 12 January 2016
Last Modified: 04 Jun 2017 08:56
URI: http://orca.cf.ac.uk/id/eprint/88105

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