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Title

Diversification patterns of planktic foraminifera in the fossil record

AuthorsCermeño, Pedro ; Castro-Bugallo, Alexandra; Vallina, Sergio M.
KeywordsCretaceous
Cenozoic
Fossil record
Planktic foraminifera
Diversification
Life-history traits
Issue DateOct-2013
PublisherElsevier
CitationMarine Micropaleontology 104: 38-43 (2013)
AbstractTheories of taxonomic diversification dispute whether global diversity has an upper limit set by the strength of biological interactions or grows in unlimited fashion until catastrophic events reset the system. We analyzed a global compendium of fossil planktic foraminifera from the early Cretaceous to the present after correcting for temporal differences in sampling effort. Our results show that their morphological diversity has increased exponentially through time in two different phases. The first phase collapsed at the Cretaceous-Paleogene boundary transition. The second phase developed through the Cenozoic era and declined during the Pliocene-Pleistocene interval, a period of time that was dominated by enhanced climatic and oceanographic instability. In none of these phases diversity reached an equilibrium level. Cenozoic faunas evolved faster than those inhabiting Cretaceous oceans, perhaps as a result of a higher environmental variability. Our results indicate that planktic foraminifera conform to an exponential diversification model. However, because catastrophic events have repeatedly reset the level of biological diversity and have kept it below the maximum, we cannot confirm whether the level of diversity is potentially unlimited. © 2013 Elsevier B.V.
Description6 pages, 7 figures, 2 tables
Publisher version (URL)http://dx.doi.org/10.1016/j.marmicro.2013.09.003
URIhttp://hdl.handle.net/10261/115510
DOI10.1016/j.marmicro.2013.09.003
Identifiersdoi: 10.1016/j.marmicro.2013.09.003
issn: 0377-8398
e-issn: 1872-6186
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