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Punctuated equilibrium

Niles EldredgeStephen Jay Gould

This page delivers no verdict; it presents claims and evidence with their sources. No theory in science is absolute. Method

For everyone

Eldredge and Gould argued that in the fossil record species remain almost unchanged for long periods (stasis), and that change happens in geologically short bursts associated with speciation. In their view the scarcity of intermediate forms reflects the real tempo of evolution rather than gaps in the record. The idea was debated as a challenge to Darwin's notion of slow, gradual change.

For specialists

The model applies Mayr's peripatric speciation to palaeontology: rapid speciation in small isolated populations, with the ancestral species remaining in stasis. Gould also used it for "species selection" and a hierarchical theory of evolution. Critics such as Dawkins and Dennett argued it is compatible with neo-Darwinism and a relatively minor difference of tempo. Cheetham's study of Neogene bryozoans was cited as an example supporting the pattern the model predicts.

Claims

Evidence

Supporting

Archaeological / fossil find

In a Neogene bryozoan lineage, species remained static for millions of years while new species appeared over short intervals.[3]

Challenging

Theoretical argument

It was argued that the observed pattern can be explained by standard neo-Darwinian processes and that the theory introduces no new mechanism.[4]

Connections

Parent

Views on the origin and diversity of living things

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Sources

  1. BookEldredge, N.; Gould, S. J. (1972). Punctuated equilibria: an alternative to phyletic gradualism. Schopf, T. J. M. (ed.), Models in Paleobiology, Freeman, Cooper & Co., San Francisco, 82–115
  2. ArticleGould, S. J.; Eldredge, N. (1977). Punctuated equilibria: the tempo and mode of evolution reconsidered. Paleobiology 3(2), 115–151DOI 10.1017/S0094837300005224archive
  3. ArticleCheetham, A. H. (1986). Tempo of evolution in a Neogene bryozoan. Paleobiology 12(2), 190–202
  4. BookDawkins, R. (1986). The Blind Watchmaker. Longman, London (chapter 9)

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Cite this page

APA

Athena contributors. (2026). Punctuated equilibrium. Athena: The tree of human knowledge. Retrieved November 1, 2026, from https://latifkedi.github.io/athena/en/d/kesintili-denge/

BibTeX
@misc{athena_kesintili_denge,
  title        = {Punctuated equilibrium},
  author       = {{Athena contributors}},
  year         = {2026},
  howpublished = {\url{https://latifkedi.github.io/athena/en/d/kesintili-denge/}},
  note         = {Athena: The tree of human knowledge. Accessed: 2026-11-01}
}

Added: September 27, 2026 · Last changed: September 27, 2026 · Page history

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