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Publication Detail
Investigation of pre-extinction dwarfing in Cenozoic planktonic foraminifera
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Journal Article
  • Authors:
    Wade BS, Olsson RK
  • Publication date:
    20/12/2009
  • Pagination:
    39, 46
  • Journal:
    Palaeogeography, Palaeoclimatology, Palaeoecology
  • Volume:
    284
  • Issue:
    1-2
  • Status:
    Published
  • 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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