Do all mass extinctions represent an ecological crisis? Evidence from the Late Ordovician

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Ecological ranking of Phanerozoic biodiversity crises: ecological and taxonomic severities are decoupled (2004, background): “In contrast to the Late Devonian, end-Triassic and end-Cretaceous crises, the end-Ordovician biodiversity crisis did not result in the permanent loss of major components of the marine ecosystem, triggered only the replacement of the P2 EEU by the P3 (Sheehan et al., 1996; Erwin, 1998; Droser et al.,”
Mass extinctions and macroevolution (2005, background): “…above, the degree of phylogenetic, morphological, or functional clustering of losses should also be important in giving survivors scope for evolutionary diversification and innovation (e.g., Valentine 1980; Erwin et al. 1987, Valentine and Walker 1987; Brenchley et al. 2001; Sheehan 2001).”