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Area of Science:

  • Animal Behavior
  • Evolutionary Biology
  • Genetics

Background:

  • Nuptial coloration serves as an honest signal of mate quality, often energetically costly.
  • Visual system optimization, regulated by opsin gene modification, aids mate selection.
  • Regulation of color vision sensitivity in terrestrial vertebrates is understudied.

Purpose of the Study:

  • To investigate the relationship between male coloration, female preference, and visual sensitivity in the green-spotted grass lizard (Takydromus viridipunctatus).
  • To understand how testosterone influences nuptial coloration and opsin gene expression.
  • To explore seasonal regulation of opsin expression in relation to breeding.

Main Methods:

  • Testosterone manipulation experiments in lizards.
  • Mate choice experiments to assess female preference.
  • Quantitative PCR (qPCR) to measure opsin gene expression (rhodopsin-like 2 and long-wavelength sensitive).

Main Results:

  • Testosterone supplementation increased male nuptial color coverage and female preference.
  • In males, higher testosterone correlated with increased rhodopsin-like 2 (rh2) and decreased long-wavelength sensitive (lws) gene expression.
  • Females exhibited opposite opsin expression patterns (increased lws, decreased rh2) during the breeding season.

Conclusions:

  • Seasonal regulation of opsin expression in both male and female lizards may enhance mate evaluation.
  • These visual system adjustments likely play a role in the evolution of nuptial coloration and sexual dimorphism.
  • Findings provide insights into the interplay between hormonal control, visual perception, and sexual selection in reptiles.