Spatio-temporal dynamics in collective frog choruses examined by mathematical modeling and field observations.
This paper reports theoretical and experimental studies on spatio-temporal dynamics in the choruses of male Japanese tree frogs. First, we theoretically model their calling times and positions as a system of coupled mobile oscillators. Numerical simulation of the model as well as calculation of the order parameters show that the spatio-temporal dynamics exhibits bistability between two-cluster antisynchronization and wavy antisynchronization, by assuming that the frogs are attracted to the edge of a simple circular breeding site. Second, we change the shape of the breeding site from the circle to rectangles including a straight line, and evaluate the stability of two-cluster and wavy antisynchronization. Numerical simulation shows that two-cluster antisynchronization is more frequently observed than wavy antisynchronization. Finally, we recorded frog choruses at an actual paddy field using our sound-imaging method. Analysis of the video demonstrated a consistent result with the aforementioned simulation: namely, two-cluster antisynchronization was more frequently realized.
Brain Science Institute, RIKEN, Saitama 351-0198, Japan.
Ikkyu
I
Aihara
Graduate School of Informatics, Kyoto University, Kyoto 606-8501, Japan.
Takeshi
T
Mizumoto
Graduate School of Informatics, Kyoto University, Kyoto 606-8501, Japan.
Takuma
T
Otsuka
Graduate School of Informatics, Kyoto University, Kyoto 606-8501, Japan.
Hiromitsu
H
Awano
Graduate School of Informatics, Kyoto University, Kyoto 606-8501, Japan.
Kohei
K
Nagira
Graduate School of Informatics, Kyoto University, Kyoto 606-8501, Japan.
Hiroshi G
HG
Okuno
Institute of Industrial Science, The University of Tokyo, Tokyo 153-8505, Japan.
Kazuyuki
K
Aihara