法国巴黎文理研究大学Ignacio Quintero等研究人员发现，不平衡的物种演化脉冲支撑哺乳动物的辐射。该研究于2024年5月31日发表于国际一流学术期刊《科学》。

研究人员将全面的系统发育和化石信息结合到一个新的“出生-死亡扩散”模型中，详细描述了哺乳动物多样化率的变化特征。研究人员发现了一种早期崛起和持续分化的情况，即在白垩纪-古近纪（K-Pg）边界之前和期间，物种分化率上升。

K-Pg大灭绝事件过滤掉了更慢的物种分化系，随后物种分化率放缓而不是反弹。这些动态源于不平衡的物种演化过程，独立的谱系产生了许多不易演化的后代。多样性似乎是由这些孤立的、快速物种分化的谱系带来的，而不是由一些点状创新带来的。

据了解，包括哺乳动物在内的主要类群的演化史往往包括其多样化动态的变化，但这些变化是如何发生的仍存在争议。

附：英文原文

Title: Imbalanced speciation pulses sustain the radiation of mammals

Author: Ignacio Quintero, Nicolas Lartillot, Hélène Morlon

Issue&Volume: 2024-05-31

Abstract: 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.

DOI: adj2793

Source: https://www.science.org/doi/10.1126/science.adj2793

期刊信息

Science：《科学》，创刊于1880年。隶属于美国科学促进会，最新IF：63.714

官方网址：https://www.sciencemag.org

投稿链接：https://cts.sciencemag.org/scc/#/login