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What Does Graptolite Origination and Extinction Reveal about the Cause of the Late Ordovician Mass Extinction?

Charles E. Mitchell (University at Buffalo) H. David Sheets (Merrimack College) Michael J. Melchin (St. Francis Xavier University) Chris Holmden (University of Saskatchewan)

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English
Cambridge University Press
05 February 2026
Assesses the macroevolutionary turnover of paleotropical planktic graptolites during the Late Ordovician Mass Extinction (LOME) via automated sequencing and capture-mark-recapture modeling. Graptolites exhibited a succession of turnover pulses (sensu Elizabeth Vrba) that were coincident with the main phases of the Hirnantian glaciation and during which the Diplograptina experienced declining metapopulation size, elevated extinction, zero species originations, and ultimately, complete extermination. Concurrently, the Neograptina (latest Katian temperate zone immigrants) exhibit pulses of both extinction and adaptive radiation. Thus, the LOME involved intense species selection and the wholesale alteration of the clade diversity structure of a major element of the zooplankton. The LOME is unlikely to have been a direct effect of ocean anoxia or sampling bias but rather resulted from Hirnantian climate change, which altered nutrient supplies and plankton community compositions along with ecological displacement and loss of habitat that together drove the succession of turnover pulses. This title is also available as open access on Cambridge Core.
By:   , , ,
Imprint:   Cambridge University Press
Country of Publication:   United Kingdom
Dimensions:   Height: 229mm,  Width: 152mm,  Spine: 5mm
Weight:   157g
ISBN:   9781009684057
ISBN 10:   1009684051
Series:   Elements of Paleontology
Pages:   88
Publication Date:  
Audience:   General/trade ,  ELT Advanced
Format:   Paperback
Publisher's Status:   Active
1. Introduction; 2. Methods; 3. Results; 4. Discussion; 5. Conclusions; Bibliography.

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