Modeling synchronized calling behavior of Japanese tree frogs

Area of Science:

• Animal behavior
• Mathematical biology
• Bioacoustics

Background:

• Male Japanese tree frogs (Hyla japonica) exhibit complex vocalizations during mating season.
• Synchronized calling behavior in anurans is crucial for mate attraction and species recognition.
• Understanding the mechanisms underlying synchronized calling requires quantitative models.

Purpose of the Study:

• To experimentally observe and model the synchronized calling behavior of male Japanese tree frogs.
• To develop phase-oscillator models that quantitatively explain experimental observations of in-phase and antiphase calling.
• To investigate the transitory dynamics and biological relevance of synchronized calling in Hyla japonica.

Main Methods:

• Experimental observation of synchronized calling in pairs of male Japanese tree frogs.
• Development of two types of phase-oscillator models with varying degrees of approximation.
• Quantitative analysis of phase and frequency properties of frog calls.
• Model fitting to experimental data and analysis of transitory dynamics.

Main Results:

• Isolated frogs called nearly periodically, while interacting pairs exhibited synchronized calling in antiphase or in-phase patterns.
• The proposed phase-oscillator models quantitatively explained the observed phase and frequency properties.
• The second model, fitted to synchronized states, successfully predicted the shift from transient in-phase to stable antiphase calling.
• Estimated parameter values showed biological relevance to Japanese tree frog calling behavior.

Conclusions:

• Phase-oscillator models provide a robust framework for understanding synchronized calling in Hyla japonica.
• The models elucidate the mechanisms driving transitions between in-phase and antiphase calling states.
• Synchronized calling behavior in Japanese tree frogs likely serves significant biological functions related to reproduction and communication.