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Mass origination versus mass extinction; the biological contribution to the Pliensbachian-Toarcian extinction event

M. Aberhan and F. T. Fuersich
Mass origination versus mass extinction; the biological contribution to the Pliensbachian-Toarcian extinction event
Journal of the Geological Society of London (January 2000) 157, Part 1: 55-60

Abstract

The Pliensbachian-Toarcian bivalve mass extinction in the Andean Basin of South America is characterized by a sharp drop in species diversity, caused mainly by extinction of endemics, and an extended lag phase. Whilst analysis of community attributes such as guild diversity, number of associations, and species richness of samples constituting associations did not yield any significant changes across the critical interval, rates of origination and extinction of species differed markedly between the various substages of the Early Jurassic. The most prominent feature is the drastic increase in the rate of origination of endemics culminating in the Early Pliensbachian. The time span between the peaks of rate of origination and extinction (5.7 Ma) closely corresponds to the longevity peak of Jurassic endemic bivalves (4-6 Ma). In addition to physico-chemical changes, we therefore explain the drop in species diversity as a result of the evolutionary dynamics of endemics, characterized by a preceding increase in the origination rate. Global mass extinctions are usually explained by one or more physico-chemical causes. We suggest that evolutionary factors, in particular species longevities, may substantially contribute to the phenomenon.


ISSN: 0016-7649
EISSN: 2041-479X
Coden: JGSLAS
Serial Title: Journal of the Geological Society of London
Serial Volume: 157, Part 1
Title: Mass origination versus mass extinction; the biological contribution to the Pliensbachian-Toarcian extinction event
Affiliation: Institut fuer Palaeontologie, Museum fuer Naturkunde, Berlin, Federal Republic of Germany
Pages: 55-60
Published: 200001
Text Language: English
Publisher: Geological Society of London, London, United Kingdom
References: 18
Accession Number: 2000-028043
Categories: Stratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 200009
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