title: Good genes and good luck: ammonoid diversity and the end-Permian mass extinction.
abstract: The end-Permian mass extinction removed more than 80% of marine genera. Ammonoid cephalopods were among the organisms most affected by this crisis. The analysis of a global diversity data set of ammonoid genera covering about 106 million years centered on the Permian-Triassic boundary (PTB) shows that Triassic ammonoids actually reached levels of diversity higher than in the Permian less than 2 million years after the PTB. The data favor a hierarchical rather than logistic model of diversification coupled with a niche incumbency hypothesis. This explosive and nondelayed diversification contrasts with the slow and delayed character of the Triassic biotic recovery as currently illustrated for other, mainly benthic groups such as bivalves and gastropods.
authors.affiliation: UMR-CNRS 5561 Biogéosciences, Université de Bourgogne, 6 Boulevard Gabriel, F-21000, Dijon, France. arnaud.brayard@u-bourgogne.fr
authors.forename: Arnaud
authors.initials: A
authors.lastname: Brayard
authors.forename: Gilles
authors.initials: G
authors.lastname: Escarguel
authors.forename: Hugo
authors.initials: H
authors.lastname: Bucher
authors.forename: Claude
authors.initials: C
authors.lastname: Monnet
authors.forename: Thomas
authors.initials: T
authors.lastname: Brühwiler
authors.forename: Nicolas
authors.initials: N
authors.lastname: Goudemand
authors.forename: Thomas
authors.initials: T
authors.lastname: Galfetti
authors.forename: Jean
authors.initials: J
authors.lastname: Guex
mesh_terms: D000818:Animals; D044822:Biodiversity; D005075:Biological Evolution; D049830:Cephalopoda / Q000145:classification / Q000235:genetics; D002980:Climate; D016208:Databases, Factual; D017753:Ecosystem; D053476:Extinction, Biological; D009792:Oceans and Seas; D010163:Paleontology; D011157:Population Dynamics; D012623:Seawater