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Summer Research Fellowship Programme of India's Science Academies

Condition dependent temporal call features in Oecanthus henryi

A Anjana

Department of Zoology, Sacred Heart College, Thevara, Kerala, Ernakulam. Pin: 682013

.Rohini Balakrishnan

Centre for Ecological Sciences, Indian Institute of Science, Bengaluru-560012

ABSTRACT

​Eco acoustics is a growing field which uses sound to evaluate animal communities. The tree cricket, Oecanthus henryi communicate acoustically in the context of long-distance mate attraction and pair formation. Males call from stationary position. Females are the choosy sex and they move towards the calling males when receptive. O. henryi males produce tonal sounds by stridulation of their modified forewings. The song has species-specific spectral and temporal features. The various temporal parameters include syllable period, syllable duration, chirp period and chirp duration. The temporal features are important as they could affect female mate choice. Females show preference to faster calling males with short chirp period, also females have been shown to prefer chirps with larger number of syllables. Temporal features can hence determine whether or not males are able to attract mates, which will in turn determine the reproductive success of males. Male conditions such as age and size can affect the temporal features of its call which could in turn affect male reproductive success. Hence, it is relevant to look at condition dependence of signal quality in tree cricket system. Analysis of temporal features was performed using Audacity and MATLAB softwares.

Keywords: Orthoptera, Eco acoustics, Oecanthus henryi, temporal features, sexual selection

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