(Table 1) Test sizes of Morozovelloides crassatus from ODP Site 171-1052 ...

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 Car...

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Bibliographic Details
Main Authors: Wade, Bridget S, Olsson, Richard K
Format: Dataset
Language:English
Published: PANGAEA 2009
Subjects:
Event label
Sample code/label
DEPTH, sediment/rock
AGE
Sample comment
Morozovelloides crassatus, size
Morozovelloides crassatus, size, standard deviation
Chamber number
Morozovelloides crassatus
Drilling/drill rig
DSDP/ODP/IODP sample designation
Leg171B
Joides Resolution
Ocean Drilling Program ODP
North Atlantic
Planktonic foraminifera
Online Access:https://dx.doi.org/10.1594/pangaea.777716
https://doi.pangaea.de/10.1594/PANGAEA.777716
Description
Summary: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. ... : Sediment depth is given in mcd. Size data are for the >300 µm fraction. ...

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