Cerulean Warblers (Dendroica cerulea) were recorded throughout the 2005–2006 breeding seasons in southern Indiana; 18 song variables were measured and compared between paired and unpaired males. The best logistic regression model for predicting pairing status included song rates and minimum frequency measures of the second section of a male Cerulean Warbler song. Unpaired males had higher song rates and higher minimum frequencies. On average, unpaired males (n = 12) sang 7.4 songs/min while paired males sang 6.4 songs/min (n = 19). Average minimum frequency was 4.0 kHz for an unpaired male and 3.5 kHz for a paired male counterpart. Female and fledgling call notes were recorded during the latter part of both breeding seasons, and quantitatively analyzed. Female chip notes (n = 4 females) had a frequency range of 4.4–8.0 kHz. Two behaviors positively identified during these vocalizations included foraging and response to a mate. Average frequency range of fledgling begging notes (n = 4 fledglings) was 5.9–7.8 kHz. Begging was the only behavior identified with these particular vocalizations. These analyses offer further understanding of intraspecific call functions and repertoire in this species.
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Vol. 121 • No. 2