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Evolving from static to dynamic signals: evolutionary compensation between two communicative signals.

Emília P Martins1, Alison G Ossip-Klein1, J Jaime Zúñiga-Vega2

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Summary

Evolutionary loss of a lizard

Keywords:
Sceloporuscommunicative displayconspicuous visual signaldynamic signalevolutionary compensationmultimodal signalstatic signal

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Area of Science:

  • Evolutionary biology
  • Animal communication
  • Behavioral ecology

Background:

  • Signals used in communication can influence each other's evolution.
  • The loss of one signal may impact the evolution of others.
  • Studying signal loss in related species can reveal evolutionary links.

Purpose of the Study:

  • To investigate the consequences of losing a color patch signal on motion displays in Sceloporus lizards.
  • To understand how evolutionary signal loss affects other components of the communicative repertoire.
  • To examine evolutionary compensation between static and dynamic signals.

Main Methods:

  • Comparative analysis of four Sceloporus lizard species, including sister taxa with and without blue-belly patches.
  • Observation and analysis of male lizard activity and headbob display structures.
  • Assessment of signal usage in different social contexts, including aggressive encounters and predator presence.

Main Results:

  • Species lacking blue-belly patches were less active, suggesting loss to reduce conspicuousness under predation pressure.
  • Headbob displays became more conspicuous over evolutionary time in species that lost color patches.
  • Males of species without color patches produced more motion displays, resembling those used in combat.

Conclusions:

  • Evolutionary loss of a static color signal was compensated by enhanced dynamic motion displays in Sceloporus lizards.
  • Dynamic motion displays can be modulated (turned on/off) to manage conspicuousness in the presence of predators.
  • Interactions between multiple signals demonstrate evolutionary compensation and linked signal evolution.