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Global Ordovician faunal transitions in the marine benthos: proximate causes

Published online by Cambridge University Press:  20 May 2016

Sean R. Connolly  and
Arnold I. Miller
Sean R. Connolly
Affiliation:
Department of Geosciences, University of Arizona, Tucson, Arizona 85721
Arnold I. Miller
Affiliation:
Department of Geology, Post Office Box 210013, University of Cincinnati, Cincinnati, Ohio 45221-0013
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Abstract

During the Ordovician Radiation, domination of benthic marine communities shifted away from trilobites, toward articulate brachiopods, and, to a lesser degree, toward bivalves and gastropods. In this paper, we identify the patterns in origination and extinction probabilities that gave rise to these transitions. Using methods adapted from capture-mark-recapture (CMR) population studies, we estimate origination, extinction, and sampling probabilities jointly to avoid confounding patterns in turnover rates with temporal variation in the quality of the fossil record. Not surprisingly, higher extinction probabilities in trilobites relative to articulate brachiopods, bivalves, and gastropods were partly responsible for relative decreases in trilobite diversity. However, articulate brachiopods also had higher origination probabilities than trilobites, indicating that relative increases in articulate brachiopod diversity would have occurred even in the absence of between-class differences in extinction probabilities. This contrasts with inferences based on earlier Phanerozoic-scale, long-term averages of turnover probabilities, and it indicates that a major cause of this faunal transition has been overlooked.

Type
Articles
Information
Paleobiology , Volume 27 , Issue 4 , Fall 2001 , pp. 779 - 795
Copyright
Copyright © The Paleontological Society 

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