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Meta-population structure and the evolutionary transition to multicellularity.

Caroline J Rose1, Katrin Hammerschmidt1, Yuriy Pichugin1

  • 1New Zealand Institute for Advanced Study, Massey University, Auckland, New Zealand.

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Ecological conditions favoring discrete dispersal phases promote the evolution of multicellularity. Competition during dispersal favors individual growth over group fitness, hindering complex life development.

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Dispersalfitness decouplinggerm linegroup selectionsoma

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Area of Science:

  • Evolutionary biology
  • Microbial ecology
  • Developmental biology

Background:

  • Multicellularity evolves frequently, but complex multicellularity is rare.
  • Experimental bacterial populations model early multicellular evolution.
  • Reproduction involves distinct developmental (soma) and dispersal (germline) phases.

Discussion:

  • Ecological conditions significantly shape group evolution.
  • Intense competition during dispersal favors individual cell growth over group benefits.
  • Mathematical modeling supports experimental findings on trait trade-offs.

Key Insights:

  • Maintaining discreteness of both the group phase and the dispersal phase is crucial for multicellular evolution.
  • Dispersal phase competition can disrupt the evolution of cooperation necessary for complex multicellularity.
  • Ecological structure influences the trajectory from simple to complex life.

Outlook:

  • Understanding ecological drivers can guide future research on the evolution of complex life.
  • This work provides a framework for studying the ecological prerequisites for major evolutionary transitions.
  • Further experiments can explore varying levels of dispersal competition and their impact on group-level traits.