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Abstract
In this study we analysed the acoustic activity of Hylodes heyeri in areas of Atlantic Forest, in southern Brazil. Observations were made in November 2001 and from January to April 2002, at Estação II Instituto Agronômico do Paraná, municipality of Morretes, State of Paraná. Males displayed three different vocalizations: advertisement calls, territorial calls, and courtship calls. Temporal and spectral parameters of advertisement and territorial calls were analysed, along with call intensity. The duration of the advertisement call showed a negative correlation with air temperature, with males decreasing the duration of advertisement calls at higher temperatures. Male body size was not correlated with any of the acoustic parameters. Details on habitat use, distances to nearest vocalizing neighbour, and daily calling activity are also included.
Acknowledgements
We thank José P. Pombal Jr and Luis M. Bini for helpful comments on an earlier version of the manuscript. Marcos Gridi‐Papp helped with comments on methodology. Megan E. Gibbons helped with the English on an earlier version. Carina M. Lingnau and Rafael Costa helped occasionally with the fieldwork. R.L. acknowledges CAPES for a graduate fellowship. R.P.B. acknowledges CNPQ for a research fellowship. We are grateful to the Instituto Brasileiro do Meio Ambiente (IBAMA) for collecting permits (licence number 155/2001).
