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Species selection on variability.

E A Lloyd1, S J Gould

  • 1Department of Philosophy, University of California, Berkeley, CA 94720, USA.

Proceedings of the National Academy of Sciences of the United States of America
|January 15, 1993
PubMed
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Species selection theory can be expanded to include aggregate traits like genetic variability. This broader view reveals variability as a key driver of macroevolutionary change.

Area of Science:

  • Evolutionary biology
  • Macroevolutionary studies
  • Population genetics

Background:

  • Traditional species selection models focus on emergent traits, often overlooking population variability.
  • Variability, an aggregate trait, is crucial for long-term clade evolution but often excluded from species selection arguments.

Purpose of the Study:

  • To broaden the definition of species selection to encompass aggregate characters, specifically genetic variability.
  • To re-evaluate classic species selection case studies under an expanded theoretical framework.

Main Methods:

  • Theoretical extension of species selection theory to include aggregate characters.
  • Reinterpretation of volutid neogastropod evolution within the framework of hierarchical selection models.

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Main Results:

  • Species selection can operate on aggregate characters, such as genetic variability.
  • The reinterpretation of volutid evolution demonstrates that organism-level counterarguments lose force when species selection on variability is considered.

Conclusions:

  • Broadening species selection to include aggregate characters, particularly variability, is essential for understanding macroevolution.
  • Species selection acting on genetic variability is a significant force in macroevolution.