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Nestling colouration is adjusted to parent visual performance in altricial birds

J M Avilés1, J J Soler

  • 1Departamento de Biología Animal y Ecología, Universidad de Granada, Granada, Spain. javiles@eeza.csic.es

Journal of Evolutionary Biology
|February 7, 2009
PubMed

Insights

Bird nestlings adjust begging signal colors to match parent vision. This study shows nestling mouth coloration varies with parent visual systems, enhancing parent-offspring communication.

Area of Science:

  • Animal Behavior
  • Evolutionary Biology
  • Ornithology

Background:

  • Nestling begging signals are crucial for parent-offspring communication.
  • Previous research focused on nestling coloration adapting to nest light, not parental vision.
  • Bird visual sensitivity varies, suggesting a role for parental visual capacities in signal evolution.

Purpose of the Study:

  • To test if nestling begging display coloration is adjusted to parental visual capacities.
  • To compare nestling coloration and visual sensitivity across 22 altricial bird species.
  • To investigate the relationship between nestling coloration and parent visual systems.

Main Methods:

  • Assessed performance of UV-tuned and violet-tuned bird eyes on nestling traits under natural light conditions.
  • Employed a comparative approach controlling for common ancestry.
  • Used a color discrimination model to analyze visual perception.

Main Results:

  • UV-tuned bird eyes showed higher performance in detecting nestling gape and body skin traits than violet-tuned eyes.
  • Nestling gape coloration was significantly associated with the parental visual system.
  • Nestlings of UV-sensitive (UVS) species had more yellow and less ultraviolet mouths than violet-sensitive (VS) species.

Conclusions:

  • Nestling coloration is adapted to parental visual perception, supporting parent-offspring communication.
  • Parental visual systems influence the evolution of nestling begging signal coloration.
  • This study provides evidence for visual signal tuning in parent-offspring interactions.

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