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Publication Detail
Investigation of pre-extinction dwarfing in Cenozoic planktonic foraminifera
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Publication Type:Journal article
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Publication Sub Type:Journal Article
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Authors:Wade BS, Olsson RK
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Publication date:20/12/2009
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Pagination:39, 46
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Journal:Palaeogeography, Palaeoclimatology, Palaeoecology
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Volume:284
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Issue:1-2
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Status:Published
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Print ISSN:0031-0182
Abstract
We propose a phenomenon termed "pre-extinction dwarfing" in Cenozoic planktonic foraminifera. High-resolution morphometric analysis shows a reduction in maximum or mean test size in the 2-20 kyr interval preceding the extinction of Pliocene Globorotalia exilis and Globorotalia miocenica from the Caribbean Sea and middle Eocene Morozovelloides crassatus from the western North Atlantic. Through a series of case studies and review of qualitative observations from the literature, we suggest that dwarfing occurs in a number of species of planktonic foraminifera foreshadowing their demise and that such size changes are not just a phenomenon associated with mass extinction events. We propose that this is a common stress-induced pattern that results in diminutive size in the pre-extinction interval. © 2009 Elsevier B.V. All rights reserved.
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