Imbalanced speciation pulses sustain the radiation of mammals

• 成果类型: Article
• 署名作者: Quintero, Ignacio; Lartillot, Nicolas; Morlon, Helene
• 署名单位: Centre National de la Recherche Scientifique (CNRS); Institut National de la Sante et de la Recherche Medicale (Inserm); Universite PSL; Ecole Normale Superieure (ENS); Centre National de la Recherche Scientifique (CNRS); CNRS - Institute of Ecology & Environment (INEE); Universite Claude Bernard Lyon 1; VetAgro Sup
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-12859
• DOI: 10.1126/science.adj2793
• 发表日期: 2024-05-31
• 页码: 1007-1012
• 关键词: adaptive radiation; species-diversity; extinction rates; key innovations; fossil-record; court jester; red queen; diversification; EVOLUTION; paleocene

摘要

The evolutionary histories of major clades, including mammals, often comprise changes in their diversification dynamics, but how these changes occur remains debated. We combined comprehensive phylogenetic and fossil information in a new birth-death diffusion model that provides a detailed characterization of variation in diversification rates in mammals. We found an early rising and sustained diversification scenario, wherein speciation rates increased before and during the Cretaceous-Paleogene (K-Pg) boundary. The K-Pg mass extinction event filtered out more slowly speciating lineages and was followed by a subsequent slowing in speciation rates rather than rebounds. These dynamics arose from an imbalanced speciation process, with separate lineages giving rise to many, less speciation-prone descendants. Diversity seems to have been brought about by these isolated, fast-speciating lineages, rather than by a few punctuated innovations.