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EVOLUTIONARILY STABLE MORPHOLOGIES IN PEA POPULATIONS.

Aaron M Ellison1, Debra Vam Vikites1

  • 1Section of Ecology and Systematics, Cornell University, Ithaca, NY, 14853, USA.

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Plant form significantly impacts competitive ability. Dense canopies outcompete open canopies, influencing plant population dynamics and evolution over generations.

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Area of Science:

  • Plant Ecology
  • Evolutionary Biology
  • Population Genetics

Background:

  • Plant morphology influences competitive interactions and population dynamics.
  • The afila locus in peas controls leaflet morphology, affecting canopy density.

Purpose of the Study:

  • To test if plant form, specifically canopy density, affects competitive ability in peas.
  • To determine the ecological and evolutionary consequences of differing plant forms in mixtures.

Main Methods:

  • Controlled field experiments using two pea varieties differing at the afila locus.
  • Assessing growth rate, size variation, mortality, and reproduction in monocultures and mixtures.
  • Analyzing population dynamics over simulated generations.

Main Results:

  • Peas with dense, finely dissected leaflets (af/af) exhibited slower growth and lower seed production than those with large leaflets (Af/-).
  • Dense-canopied plants (Af/-) shaded out neighbors more effectively, leading to competitive exclusion.
  • Mixtures predicted to shift towards Af/- monocultures within four generations.

Conclusions:

  • Increased morphological complexity, such as leafiness, confers a significant competitive advantage.
  • Plant form is a critical factor driving ecological dynamics and evolutionary trajectories in plant populations.