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Area of Science:

  • Animal behavior
  • Bioacoustics
  • Evolutionary biology

Background:

  • Male animals often aggregate and vocalize to attract females.
  • Synchronized calling in animal choruses is a common but debated phenomenon.
  • Synchronization may arise from collective benefits or male-male competition.

Purpose of the Study:

  • Investigate chorus organization in the Emerald cicada (Zammara smaragdula).
  • Determine if cicada call rhythm synchronization occurs and explore its evolutionary drivers.
  • Examine factors influencing temporal call overlap in cicada choruses.

Main Methods:

  • Field observations of Emerald cicada choruses in Belize.
  • Analysis of call timing and temporal aggregation patterns.
  • Assessment of synchronization based on call intervals and durations.

Main Results:

  • Emerald cicada choruses occurred at dawn, dusk, and occasionally during the day.
  • No evidence of call rhythm synchronization was found among males.
  • Collective calling bouts followed variable quiet intervals, suggesting competitive origins.
  • Temporal call overlap varied with chorus phase and time of day.

Conclusions:

  • The temporal aggregation of Emerald cicada calls likely stems from male-male competition, not collective benefits.
  • Chorus organization shows flexibility, potentially influenced by environmental variables like cicada density, predation, or temperature.