Mantidactylus guttulatus (Boulenger, 1881)

The calls were recorded at an air temperature of 20.5 C and a water temperature of 19.0 C; because the specimen was partly sitting in shallow water, and partly on a log above the water, its body temperature can be estimated as 20 C. Calls ('' g. 1) were short guttural blasts emitted singly or in pairs after long, irregular intervals of 27-71 seconds (n   3), resulting in a call rate of 0.8-2.2 per minute. Calls consisted of single notes that were composed of unharmonious pulses, with a pulse rate of 21-23 per second. Temporal characteristics of the calls are summarized in table 1. The intensity and duration of notes increased during the beginning of the call and decreased again towards the end. Frequency ranged between 400 and 3100 Hz, dominant frequency was 700-1700 Hz. Between 1800- 2800 Hz very low or no signal was recorded, so that the frequency band at 2800-3100 Hz gives the impression of a harmonic (fig. 1). [1]

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