Abstract
This study described the advertisement calls of two ground-dwelling species of frogs of the genusPlatymantis from Mount Magdiwata, San Francisco, Agusan del Sur, Philippines. The two species shared a common micro-habitat preference being found on rocks or edges of slope ground, leaf litter, and on steep slopes of stream banks. The researchers analyzed the calls for their temporal and spectral characteristics. Audiospectrograms, oscillograms and power spectra presented the numerical parameters and graphical representations of the advertisement calls. The vocalization of both species revealed significant differences in terms of the dominant frequency, call duration, number of notes, note duration, and intercall at p < 0.01. Statistical analysis of Platymantis magdiwataspecies A showed a positive correlation between the body size length and note duration (R2 = 0.377, p<0.01). On the other hand, the body size length of Platymantis magdiwata species B showed a negative correlation with the dominant frequency (R2 = -0.248; p<0.01), and a positive correlation with the call duration and the number of notes (R2 = 0.698 and R2 = 0.699; p<0.01). Both species possess unique advertisement calls that distinguish them from each other. Key words: Bioacoustics, advertisement call, Platymantis, Philippines.
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