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This study reveals feedback loops between sexually transmitted diseases and mating strategies. Pathogen presence and transmission rates influence mating system evolution, with disease disappearance potentially predicting polyandry extinction.

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Area of Science:

  • Evolutionary biology
  • Epidemiology
  • Behavioral ecology

Background:

  • The interplay between mating system evolution and sexually transmitted diseases (STDs) is understudied.
  • Understanding these reciprocal influences is crucial for evolutionary and epidemic dynamics.

Purpose of the Study:

  • To investigate the feedback loops between pathogen transmissibility and the evolution of female mating strategies (monandry vs. polyandry).
  • To explore emergent behaviors and tipping points in mating systems influenced by STDs.

Main Methods:

  • Developed an agent-based model to simulate mating strategy evolution under STD spread.
  • Incorporated reproductive costs associated with the hypothetical STD.

Main Results:

  • Confirmed feedback loops between pathogen transmissibility and mating strategy evolution.
  • Observed non-linear dynamics and tipping points, including switches between disease-free and endemic states.
  • Disease disappearance may predict the extinction of polyandrous strategies; high transmission can suppress polyandry.

Conclusions:

  • Reciprocal influences between disease dynamics and sexual behavior offer insights into STD transmission and reproductive strategy evolution.
  • Mating systems are sensitive to variations in ecological and disease contexts.