Translator Disclaimer
1 December 2000 Silurian trilobite alpha diversity and the end-Ordovician mass extinction
Author Affiliations +
Abstract

Following the end-Ordovician extinction, global clade diversity of Silurian trilobites dropped to about half of Ordovician levels. Although clade diversity failed to recover, this extinction had surprisingly little long-term impact on the number of trilobite species that occupied local habitats (alpha diversity). A new compilation of data from Laurentia and other continents indicates that Silurian trilobite alpha diversities in all major environments were comparable to those of the Late Cambrian and Ordovician; shallow subtidal diversity reached an all-time high during the Late Ordovician. The profound differences in patterns at local and global levels demonstrate the necessity for a hierarchical approach to analyses of diversity. Factors governing global clade diversity are lodged at hierarchical levels beyond those controlling local species richness and must be sought in studies of between-habitat (beta) or geographic (gamma) diversity.

Jonathan M. Adrain, Stephen R. Westrop, Brian D. E. Chatterton, and Lars Ramsköld "Silurian trilobite alpha diversity and the end-Ordovician mass extinction," Paleobiology 26(4), (1 December 2000). https://doi.org/10.1666/0094-8373(2000)026<0625:STADAT>2.0.CO;2
Accepted: 1 March 2000; Published: 1 December 2000
JOURNAL ARTICLE
22 PAGES


SHARE
ARTICLE IMPACT
RIGHTS & PERMISSIONS
Get copyright permission
Back to Top