Investigation of pre-extinction dwarfing in Cenozoic planktonic Foraminifera

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doi: 10.1016/j.palaeo.2009.08.026
Author(s): Wade, Bridget S.; Olsson, Richard K.
Author Affiliation(s): Primary:
Rutgers State University of New Jersey, Department of Earth and Planetary Sciences, Piscataway, NJ, United States
University of Plymouth, United Kingdom
Volume Title: Extinction, dwarfing and the Lilliput effect
Volume Author(s): Wade, Bridget S., editor; Twitchett, Richard J.
Source: Extinction, dwarfing and the Lilliput effect, edited by Bridget S. Wade and Richard J. Twitchett. Palaeogeography, Palaeoclimatology, Palaeoecology, 284(1-2), p.39-46. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0031-0182 CODEN: PPPYAB
Note: In English. With appendix. 40 refs.; illus., incl. 1 table, 1 plate
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. Abstract Copyright (2009) Elsevier, B.V.
Year of Publication: 2009
Research Program: DSDP Deep Sea Drilling Project
ODP Ocean Drilling Program
Key Words: 10 Paleontology, Invertebrate; Atlantic Ocean; Biometry; Blake Nose; Blake Plateau; Caribbean Sea; Cenozoic; Colombian Basin; DSDP Site 154; Deep Sea Drilling Project; Dwarfism; East Pacific; Eocene; Equatorial Pacific; Extinction; Foraminifera; Globigerinacea; Globorotalia; Globorotaliidae; Invertebrata; Leg 15; Leg 171B; Leg 199; Lilliput effect; Marine environment; Microfossils; Middle Eocene; Morozovelloides; Morphology; Morphometry; Neogene; North Atlantic; North Pacific; Northeast Pacific; ODP Site 1052; ODP Site 1218; Ocean Drilling Program; Pacific Ocean; Paleoecology; Paleogene; Planktonic taxa; Pliocene; Protista; Rotaliina; Size; Stress; Tertiary; Tests
Coordinates: N110518 N110518 W0802245 W0802245
N295705 N295705 W0763736 W0763736
N085300 N085300 W1352200 W1352200
Record ID: 2010019150
Copyright Information: GeoRef, Copyright 2017 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands