(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:
171-1052B
171-1052F
AGE
Blake Nose
North Atlantic Ocean
Chamber number
DEPTH
sediment/rock
DRILL
Drilling/drill rig
DSDP/ODP/IODP sample designation
Event label
Joides Resolution
Leg171B
Morozovelloides crassatus
size
standard deviation
Ocean Drilling Program
ODP
Sample code/label
Sample comment
North Atlantic
Planktonic foraminifera
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.777716
https://doi.org/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.

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