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JRM Vol.29 No.1 pp. 247-254
doi: 10.20965/jrm.2017.p0247
(2017)

Paper:

Size Effect on Call Properties of Japanese Tree Frogs Revealed by Audio-Processing Technique

Ikkyu Aihara*1, Ryu Takeda*2, Takeshi Mizumoto*3, Takuma Otsuka*4, and Hiroshi G. Okuno*5

*1Graduate School of Systems and Information Engineering, University of Tsukuba
1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573, Japan

*2The Institute of Scientific and Industrial Research, Osaka University
8-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan

*3Honda Research Institute Japan Co., Ltd.
8-1 Honcho, Wako-shi, Saitama 351-0188, Japan

*4NTT Communication Science Laboratories, NTT Corporation
2-4 Hikaridai, Seikacho, Kyoto 619-0237, Japan

*5Graduate Program for Embodiment Informatics, Waseda University
Lambdax Bldg 3F, 2-4-12 Okubo, Shinjuku, Tokyo 169-0072, Japan

Received:
July 20, 2016
Accepted:
September 6, 2016
Published:
February 20, 2017
Keywords:
animal behavior, frog chorus, independent component analysis, microphone array, advertisement call
Abstract

Size Effect on Call Properties of Japanese Tree Frogs Revealed by Audio-Processing Technique

Calling behavior of a male Japanese Tree Frog

Sensing the external environment is a core function of robots and autonomous mechanics. This function is useful for monitoring and analyzing the ecosystem for our deeper understanding of the nature and accomplishing the sustainable ecosystem. Here, we investigate calling behavior of male frogs by applying audio-processing technique on multiple audio data. In general, male frogs call from their breeding site, and a female frog approaches one of the males by hearing their calls. First, we conducted an indoor experiment to record spontaneous calling behavior of three male Japanese tree frogs, and then separated their call signals according to independent component analysis. The analysis of separated signals shows that chorus size (i.e., the number of calling frogs) has a positive effect on call number, inter-call intervals, and chorus duration. We speculate that a competition in a large chorus encourages the male frogs to make their call properties more attractive to conspecific females.

Cite this article as:
I. Aihara, R. Takeda, T. Mizumoto, T. Otsuka, and H. Okuno, “Size Effect on Call Properties of Japanese Tree Frogs Revealed by Audio-Processing Technique,” J. Robot. Mechatron., Vol.29, No.1, pp. 247-254, 2017.
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Last updated on Nov. 16, 2018