Resumo

PACHECO-VARGAS, G  e  LOSADA-PRADO, S. Effect of the Traffc Noise on the Songs of Hylophilus Flavipes and Cyclarhis gujanensis. Ciencia en Desarrollo [online]. 2015, vol.6, n.2, pp.177-183. ISSN 0121-7488.

The acoustic adaptation hypothesis had evidenced that the structure of habitat and human intervention are factors that influence the variation in bird vocalizations. This study estimated the effect of road traffc noise on the vocalizations of Cyclarhis gujanensis and Hylophilus flavipes. Parallel transects were laid at two locations in tropical dry forest in the Tolima department, and the songs and noise intensity measurements were recorded. H. flavipes and C. gujanensis sang songs with a higher minimum frequency when in places with noise level above 40 dB. Additionaly, H. flavipes sang songs with a shorter duration of notes and longer duration between notes, and sang with fewer notes in places close to the highway. Furthermore, the last note of C. gujanensis songs tended to be longer under these conditions. This study demonstrated a variation in vocalizations of two species under road traffc noise, with a greater response from H. flavipes than C. gujanensis.

Palavras-chave : Noise; Road traffc noise; Rufous-browed Peppershrike; Scrub greenlet; Song.

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