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  2. Punctuated equilibrium - Wikipedia

    en.wikipedia.org/wiki/Punctuated_equilibrium

    However, the punctuational equilibrium model may still be inferred from both the observation of stasis and examples of rapid and episodic speciation events documented in the fossil record. [70] Dawkins also emphasizes that punctuated equilibrium has been "oversold by some journalists", [71] but partly due to Eldredge and Gould's "later writings ...

  3. Speciation - Wikipedia

    en.wikipedia.org/wiki/Speciation

    Punctuated equilibrium, bottom, consists of morphological stability and rare, relatively rapid bursts of evolutionary change. There is debate as to the rate at which speciation events occur over geologic time.

  4. Punctuated gradualism - Wikipedia

    en.wikipedia.org/wiki/Punctuated_gradualism

    Punctuated gradualism is considered to be a variation of these models, lying somewhere in between the phyletic gradualism model and the punctuated equilibrium model. It states that speciation is not needed for a lineage to rapidly evolve from one equilibrium to another but may show rapid transitions between long-stable states.

  5. Extended evolutionary synthesis - Wikipedia

    en.wikipedia.org/wiki/Extended_evolutionary...

    In the 1980s, the American palaeontologists Stephen Jay Gould and Niles Eldredge argued for an extended synthesis based on their idea of punctuated equilibrium, the role of species selection shaping large scale evolutionary patterns and natural selection working on multiple levels extending from genes to species. [30] [31] [32] [33]

  6. Bak–Sneppen model - Wikipedia

    en.wikipedia.org/wiki/Bak–Sneppen_model

    The Bak–Sneppen model is a simple model of co-evolution between interacting species. It was developed to show how self-organized criticality may explain key features of the fossil record, such as the distribution of sizes of extinction events and the phenomenon of punctuated equilibrium .

  7. Portal:Evolutionary biology - Wikipedia

    en.wikipedia.org/wiki/Portal:Evolutionary_biology

    In evolutionary biology, punctuated equilibrium (also called punctuated equilibria) is a theory that proposes that once a species appears in the fossil record, the population will become stable, showing little evolutionary change for most of its geological history.

  8. Why the stock market crushed expectations in 2024 - AOL

    www.aol.com/why-stock-market-crushed...

    The S&P 500 has surged 27% in 2024, on track for its best year since 2019. Wall Street forecasters weren't particularly bullish at the start of the year.

  9. Stephen Jay Gould - Wikipedia

    en.wikipedia.org/wiki/Stephen_Jay_Gould

    Gould's most significant contribution to evolutionary biology was the theory of punctuated equilibrium [2] developed with Niles Eldredge in 1972. [3] The theory proposes that most evolution is characterized by long periods of evolutionary stability, infrequently punctuated by swift periods of branching speciation.