General statistical model shows that macroevolutionary patterns and processes are consistent with Darwinian gradualism

Pagel, M. ORCID: https://orcid.org/0000-0001-7287-8865, O’Donovan, C. ORCID: https://orcid.org/0000-0003-4770-4227 and Meade, A. ORCID: https://orcid.org/0000-0001-7095-7711 (2022) General statistical model shows that macroevolutionary patterns and processes are consistent with Darwinian gradualism. Nature Communications, 13 (1). 1113. ISSN 2041-1723 doi: 10.1038/s41467-022-28595-z

Abstract/Summary

Abstract: Macroevolution posed difficulties for Darwin and later theorists because species’ phenotypes frequently change abruptly, or experience long periods of stasis, both counter to the theory of incremental change or gradualism. We introduce a statistical model that accommodates this uneven evolutionary landscape by estimating two kinds of historical change: directional changes that shift the mean phenotype along the branches of a phylogenetic tree, and evolvability changes that alter a clade’s ability to explore its trait-space. In mammals, we find that both processes make substantial independent contributions to explaining macroevolution, and are rarely linked. ‘Watershed’ moments of increased evolvability greatly outnumber reductions in evolutionary potentials, and large or abrupt phenotypic shifts are explicable statistically as biased random walks, allowing macroevolutionary theory to engage with the language and concepts of gradualist microevolution. Our findings recast macroevolutionary phenomena, illustrating the necessity of accounting for a variety of evolutionary processes simultaneously.

Item Type	Article
URI	https://reading-clone.eprints-hosting.org/id/eprint/103925
Identification Number/DOI	10.1038/s41467-022-28595-z
Divisions	Life Sciences > School of Biological Sciences > Ecology and Evolutionary Biology
Uncontrolled Keywords	Article, /631/181/2468, /631/181/757, /631/601, article
Publisher	Nature Publishing Group UK
Download/View statistics	View download statistics for this item