The origin of higher taxa: macroevolutionary processes, and the case of the mammals

Kemp, T. S.

doi:10.1111/j.1463-6395.2007.00248.x

Cited by 49Evolution and Paleontology StudiesEvolution and Genetic DynamicsMorphological variations and asymmetry

The origin of higher taxa: macroevolutionary processes, and the case of the mammals

Kemp, T. S.·2007·Acta Zoologica

DOI 10.1111/j.1463-6395.2007.00248.x

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Abstract

Abstract The origin of a new higher taxon is characterized by a long‐term phylogenetic trend, involving evolutionary changes in a large number of characters. At this phylogenetic level, the conflict between internal integration of the phenotype and its evolvability can be resolved by the correlated progression model, in which many disparate traits evolve by a sequence of small increments in loose correlation with one another, rather than by the modularity model. The trend leading to the new higher taxon implies the existence of a long ridge in an adaptive landscape. An evolutionary lineage tracking it requires adaptive changes in broad biological characteristics, involving many traits. Species selection is a possible additional driver of the trend. These conclusions are tested against the synapsid fossil record of the origin of mammals. The reconstructed sequence of acquisition of mammalian traits supports the correlated progression model. The adaptive ridge involved is postulated to have been a sequence of overlapping niches requiring increasing ability to remain active in daily and seasonally fluctuating environments by means of increasing internal regulation. An inferred speciation bias in favour of relatively small, relatively more progressive carnivores indicates that species selection was also involved in driving the trend. Palaeoenvironmental evidence indicates that ecological opportunity probably played a role at certain points along the lineage.

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Authors: Kemp, T. S.
Affiliations: University of Oxford (GB)
Corresponding author: Kemp, T. S.
Venue: Acta Zoologica
Publisher: Wiley
Published: 2006-12-15
Volume: 88
Issue: 1
Pages: 3-22
ISSN: 0001-7272 (ISSN-L)
1463-6395
DOI: 10.1111/j.1463-6395.2007.00248.x
OpenAlex: W2106540379
Cited by: 49
References: 104
Citations by year: 2025: 3 · 2024: 2 · 2023: 2 · 2022: 2 · 2020: 3 · 2019: 1 · 2018: 1 · 2017: 2 · 2016: 1 · 2015: 3 · 2014: 7 · 2013: 1 · 2012: 4
FWCI: 3.65
Type: journal article
Language: en
Open access: closed
Licence: onlinelibrary.wiley.com/termsAndConditions#vor (vor)
Locations: Acta Zoologica (publishedVersion)
Topics: Physical Sciences › Earth and Planetary Sciences › Paleontology › Evolution and Paleontology Studies
Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Evolution and Genetic Dynamics
Physical Sciences › Mathematics › Geometry and Topology › Morphological variations and asymmetry
Keywords: macroevolution, mammals, synapsids, fitness landscape, species selection, phylogenetic trends, ecological opportunity, carnivores, fossil record, paleoenvironment

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The origin of higher taxa: macroevolutionary processes, and the case of the mammals

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