Vocalization of Hylodes meridionalis (Mertens 1927) (Anura, Hylodidae) in Rio Grande do Sul, Brazil, with comments on nocturnal calling in the family Hylodidae
2013
Lingnau, Rodrigo | Zank, Caroline | Colombo, Patrick | Kwet, Axel
We describe the advertisement and territorial calls of Hylodes meridionalis for the first time and provide observations on nocturnal calling activity for this species. The advertisement call has 36–82 harmonic notes, with duration of 2.71–5.69 s and dominant frequency on the third harmonic. Advertisement calls are separated by large intervals varying from 18.7 to 44.7 s. The territorial call has 1–3 notes, with duration of 0.039–0.567 seconds, and dominant frequency also on the third harmonic. Territorial calls are emitted at a much higher repetition rate than the advertisement call, with intervals of 1.1–1.6 s between each call. Frogs of the genus Hylodes are known to call mainly during the day, but for H. meridionalis nocturnal calling was observed on various occasions, and could occur regularly until two hours after sunset, or sporadically along the night.
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