Rapid radiations underlie most of the known diversity of life

Rapid radiations, including adaptive radiations, are of considerable interest to evolutionary biologists, in large part because they are thought to underlie much of the species diversity of life. Yet, this fundamental idea has only been tested at a limited scale, within frogs. Here, we test this ide...

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Main Authors: John J. Wiens, Daniel S. Moen
Format: Article
Language:English
Published: Frontiers Media S.A. 2025-08-01
Series:Frontiers in Ecology and Evolution
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Online Access:https://www.frontiersin.org/articles/10.3389/fevo.2025.1596591/full
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author John J. Wiens
Daniel S. Moen
author_facet John J. Wiens
Daniel S. Moen
author_sort John J. Wiens
collection DOAJ
description Rapid radiations, including adaptive radiations, are of considerable interest to evolutionary biologists, in large part because they are thought to underlie much of the species diversity of life. Yet, this fundamental idea has only been tested at a limited scale, within frogs. Here, we test this idea across living organisms and within many of the largest clades (e.g. animals, plants). Specifically, we quantify how much of Earth’s species richness is contained within rapid radiations (clades with high net diversification rates). We find that among the major clades of living organisms and among land plant phyla and animal phyla, >80% of known species richness is contained within the few clades in the upper 90th percentile for diversification rates in each group. Thus, these exceptionally rapid radiations contain most of Earth’s extant species diversity. Patterns were broadly similar using smaller clades (orders, families) and in insects and vertebrates, with the majority of species generally contained within clades in the upper 75th percentile. Results were also similar using large-scale clades defined by their ages instead of taxonomic ranks. Overall, these results show for the first time that most of the known species richness of life is explained by rapid radiations. Moreover, phenotypic evidence from previous studies suggests that some of the most species-rich rapid radiations across life, animals, and plants may also qualify as adaptive radiations.
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spelling doaj-art-3666476f3c604fde84b47e88f240270a2025-08-20T05:32:51ZengFrontiers Media S.A.Frontiers in Ecology and Evolution2296-701X2025-08-011310.3389/fevo.2025.15965911596591Rapid radiations underlie most of the known diversity of lifeJohn J. Wiens0Daniel S. Moen1Department of Ecology and Evolutionary Biology, University of Arizona, Tucson, AZ, United StatesDepartment of Evolution, Ecology, and Organismal Biology, University of California, Riverside, Riverside, CA, United StatesRapid radiations, including adaptive radiations, are of considerable interest to evolutionary biologists, in large part because they are thought to underlie much of the species diversity of life. Yet, this fundamental idea has only been tested at a limited scale, within frogs. Here, we test this idea across living organisms and within many of the largest clades (e.g. animals, plants). Specifically, we quantify how much of Earth’s species richness is contained within rapid radiations (clades with high net diversification rates). We find that among the major clades of living organisms and among land plant phyla and animal phyla, >80% of known species richness is contained within the few clades in the upper 90th percentile for diversification rates in each group. Thus, these exceptionally rapid radiations contain most of Earth’s extant species diversity. Patterns were broadly similar using smaller clades (orders, families) and in insects and vertebrates, with the majority of species generally contained within clades in the upper 75th percentile. Results were also similar using large-scale clades defined by their ages instead of taxonomic ranks. Overall, these results show for the first time that most of the known species richness of life is explained by rapid radiations. Moreover, phenotypic evidence from previous studies suggests that some of the most species-rich rapid radiations across life, animals, and plants may also qualify as adaptive radiations.https://www.frontiersin.org/articles/10.3389/fevo.2025.1596591/fulladaptive radiationbiodiversitydiversificationmacroevolutionspecies richness
spellingShingle John J. Wiens
Daniel S. Moen
Rapid radiations underlie most of the known diversity of life
Frontiers in Ecology and Evolution
adaptive radiation
biodiversity
diversification
macroevolution
species richness
title Rapid radiations underlie most of the known diversity of life
title_full Rapid radiations underlie most of the known diversity of life
title_fullStr Rapid radiations underlie most of the known diversity of life
title_full_unstemmed Rapid radiations underlie most of the known diversity of life
title_short Rapid radiations underlie most of the known diversity of life
title_sort rapid radiations underlie most of the known diversity of life
topic adaptive radiation
biodiversity
diversification
macroevolution
species richness
url https://www.frontiersin.org/articles/10.3389/fevo.2025.1596591/full
work_keys_str_mv AT johnjwiens rapidradiationsunderliemostoftheknowndiversityoflife
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