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Why have aggregative multicellular organisms stayed simple?

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Summary
This summary is machine-generated.

Multicellularity evolved clonally in five lineages, avoiding social conflict. Aggregative multicellularity, while potentially mitigating cheating, faces constraints that limit complex evolution.

Keywords:
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Area of Science:

  • Evolutionary Biology
  • Developmental Biology

Background:

  • Multicellularity has evolved independently multiple times in eukaryotes.
  • A key distinction is clonal development versus aggregation of free-living cells.
  • Complex multicellularity evolved clonally in animals, plants, red algae, brown algae, and fungi.

Purpose of the Study:

  • To explore why complex multicellularity evolved clonally.
  • To investigate constraints on aggregative multicellularity.
  • To examine the role of social evolution and life-cycle features.

Main Methods:

  • Review of social evolutionary theory.
  • Analysis of life-cycle characteristics of aggregative multicellular organisms.
  • Comparison of clonal and aggregative developmental strategies.

Main Results:

  • Clonal development avoids social conflict inherent in non-clonal groups.
  • Aggregative multicellularity may face constraints due to rapid aggregation needs and facultative life cycles.
  • Facultative multicellularity limits the evolution of traits with cell-level fitness costs.

Conclusions:

  • Social conflict is a significant factor favoring clonal development for complex multicellularity.
  • Life-cycle features, particularly facultative unicellularity, independently constrain aggregative multicellular evolution.
  • Aggregative multicellular organisms may have limited potential for evolving complex multicellularity.