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Size patterns through time: the case of the Early Jurassic ammonite radiation

Published online by Cambridge University Press:  08 April 2016

Jean-Louis Dommergues ,
Sophie Montuire  and
Pascal Neige
Jean-Louis Dommergues
Affiliation:
Biogéosciences (UMR CNRS 5561), Université de Bourgogne, 6 boulevard Gabriel, 21000 Dijon, France. E-mail: Jean-Louis.Dommergues@u-bourgogne.fr
Sophie Montuire
Affiliation:
Biogéosciences (UMR CNRS 5561), Université de Bourgogne, 6 boulevard Gabriel, 21000 Dijon, France. E-mail: Sophie.Montuire@u-bourgogne.fr
Pascal Neige
Affiliation:
Biogéosciences (UMR CNRS 5561), Université de Bourgogne, 6 boulevard Gabriel, 21000 Dijon, France. E-mail: Pascal.Neige@u-bourgogne.fr
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Abstract

The shell size of 1236 ammonite species representing all known Early Jurassic faunas is analyzed. Size patterns are studied for the entire period and then at the biozone scale for the first four stages of the Jurassic (28 Myr), during which ammonites recovered from the crisis at the Triassic/Jurassic (T/J) boundary. Our analysis reveals that (1) a size continuum (normal distribution from “dwarfs” to “giants”) exists for all Early Jurassic ammonites; (2) although there are no sustained trends (e.g., no Cope's rule), the succession is not monotonous and patterns may differ conspicuously from one biozone to the next; and (3) increases and decreases in size range are the most frequent evolutionary styles of size change. The only pattern that can be connected with a particular episode of Early Jurassic ammonite history is the initial increase in size disparity during the first four biozones attributable to phyletic radiation after the T/J crisis. Subsequent correlations with environmental constraints (e.g., sea-level changes), although suspected, cannot be shown.

Type
Articles
Information
Paleobiology , Volume 28 , Issue 4 , Fall 2002 , pp. 423 - 434
Copyright
Copyright © The Paleontological Society 

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