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Is there room for punctuated equilibrium in macroevolution?

Matthew W Pennell¹, Luke J Harmon¹, Josef C Uyeda¹

¹Department of Biological Sciences and Institute for Bioinformatics and Evolutionary Studies, University of Idaho, Moscow, ID 83844, USA.

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|August 28, 2013

Summary

This summary is machine-generated.

The theory of punctuated equilibrium (PE) suggests rapid evolution during speciation. This paper argues PE conflates four distinct evolutionary questions, hindering scientific progress by oversimplifying complex evolutionary patterns.

Keywords:

comparative methods macroevolution paleobiology phylogenetics punctuated equilibrium

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Area of Science:

Evolutionary biology
Paleontology
Speciation research

Background:

The theory of punctuated equilibrium (PE) posits that evolutionary change is rapid during speciation events, interspersed with long periods of stasis.
Recent advancements in statistical methodologies have contributed to a renewed interest in PE within the scientific community.
However, the conceptual framework of PE has been a subject of long-standing debate and controversy.

Purpose of the Study:

To deconstruct the theory of punctuated equilibrium (PE) into its constituent, distinct research questions.
To critically evaluate the conflation of these separate questions under the umbrella of PE.
To propose a clearer approach for advancing research on evolutionary patterns and speciation.

Main Methods:

Conceptual analysis and synthesis of existing evolutionary theory.
Identification and separation of four core questions within the PE framework: pace of evolution, location of trait change, mode of change (adaptive vs. neutral), and role of species selection.
Discussion of current research progress on each individual question.

Main Results:

Punctuated equilibrium (PE) unnecessarily combines four distinct questions: (i) gradualism vs. pulsed evolution, (ii) trait evolution at speciation vs. within lineages, (iii) adaptive vs. neutral speciation changes, and (iv) importance of species selection.
Progress is being made on each of these four questions independently.
The conflation of these distinct issues under the PE framework is identified as a significant impediment to scientific advancement.

Conclusions:

The theory of punctuated equilibrium (PE) is a complex amalgamation of four separate, though related, scientific inquiries.
Separating these questions is crucial for clarity and focused research in evolutionary biology.
De-emphasizing the overarching PE framework is likely to accelerate progress in understanding evolutionary dynamics and speciation.