DOI: 10.5061/dryad.nf61t
title: Data from: Phylogenetic clustering of origination and extinction across the Late Ordovician mass extinction

description: Mass extinctions can have dramatic effects on the trajectory of life, but
 in some cases the effects can be relatively small even when extinction
 rates are high. For example, the Late Ordovician mass extinction is the
 second most severe in terms of the proportion of genera eliminated, yet is
 noted for the lack of ecological consequences and shifts in clade
 dominance. By comparison, the end-Cretaceous mass extinction was less
 severe but eliminated several major clades while some rare surviving
 clades diversified in the Paleogene. This disconnect may be better
 understood by incorporating the phylogenetic relatedness of taxa into
 studies of mass extinctions, as the factors driving extinction and
 recovery are thought to be phylogenetically conserved and should therefore
 promote both origination and extinction of closely related taxa. Here, we
 test whether there was phylogenetic selectivity in extinction and
 origination using brachiopod genera from the Middle Ordovician through the
 Devonian. Using an index of taxonomic clustering (RCL) as a proxy for
 phylogenetic clustering, we find that A) both extinctions and originations
 shift from taxonomically random or weakly clustered within families in the
 Ordovician to strongly clustered in the Silurian and Devonian, beginning
 with the recovery following the Late Ordovician mass extinction, and B)
 the Late Ordovician mass extinction was itself only weakly clustered. Both
 results stand in stark contrast to Cretaceous-Cenozoic bivalves, which
 showed significant levels of taxonomic clustering of extinctions in the
 Cretaceous, including strong clustering in the mass extinction, but
 taxonomically random extinctions in the Cenozoic. The contrasting patterns
 between the Late Ordovician and end-Cretaceous events suggest a complex
 relationship between the phylogenetic selectivity of mass extinctions and
 the long-term phylogenetic signal in origination and extinction patterns.
description: Krug & Patzkowsky
 2015 Stages and Families copyData for data binned
 into stages temporally. Analysis is for extinction and origination of
 genera within families. M-tax files designate genera within the same
 family in each interval. M_ext files designate genera within each interval
 that go extinct simultaneously within the interval. M_orig files designate
 genera that originate simultaneously within the interval. The number at
 the ned of the file designates the interval in
 question.Krug & Patzkowsky
 2015 Stages and Superfamilies copyData for data binned
 into stages temporally. Analysis is for extinction and origination of
 genera within superfamilies. M-tax files designate genera within the same
 family in each interval. M_ext files designate genera within each interval
 that go extinct simultaneously within the interval. M_orig files designate
 genera that originate simultaneously within the interval. The number at
 the ned of the file designates the interval in
 question.Krug & Patzkowsky
 2015 Substages and Families copyData for data binned
 into substages temporally. Analysis is for extinction and origination of
 genera within families. M-tax files designate genera within the same
 family in each interval. M_ext files designate genera within each interval
 that go extinct simultaneously within the interval. M_orig files designate
 genera that originate simultaneously within the interval. The number at
 the ned of the file designates the interval in
 question.