. Bulletin of the British Ornithologists' Club. Birds. Mark B Robbins <X Kevin ./. Zimmer 217 Hull. HOC. 2005 125(3) 'a s^ JM 'y s A. 1 2 l+4H^ it 'M"M'i 1 r 1 2 Simoxenops u: ay a 1b: W rrm ; ;ii |||3« liailiriliilUlllllllill 4 5 6 Time (seconds) Figure 2. Vocalisations of various species of Syndactyla and Simoxenops foliage-gleaners, (a) Syndactyla subalaris: natural song, Monteverde Cloud Forest Reserve, Costa Rica (March 1994). (b) Syndactyla subalaris: single-note call, Cerro de la Muerte, Costa Rica (March 1997). (c) Syndactyla ruficollis: natural song, Abra Porculla. d
. Bulletin of the British Ornithologists' Club. Birds. Mark B Robbins <X Kevin ./. Zimmer 217 Hull. HOC. 2005 125(3) 'a s^ JM 'y s A. 1 2 l+4H^ it 'M"M'i 1 r 1 2 Simoxenops u: ay a 1b: W rrm ; ;ii |||3« liailiriliilUlllllllill 4 5 6 Time (seconds) Figure 2. Vocalisations of various species of Syndactyla and Simoxenops foliage-gleaners, (a) Syndactyla subalaris: natural song, Monteverde Cloud Forest Reserve, Costa Rica (March 1994). (b) Syndactyla subalaris: single-note call, Cerro de la Muerte, Costa Rica (March 1997). (c) Syndactyla ruficollis: natural song, Abra Porculla. dpto. Piura, Peru (24 January 2001). (d) Syndactyla ruficollis: single-note call. Abra Porculla. dpto. Piura, Peru (24 January 2001). (e) Syndactyla rufosuperciliata: natural song, Serra do Caraca. Minas Gerais, Brazil (6 September 2001). (f) Syndactyla rufosuperciliata: single-note call. Itatiaia National Park. Rio de Janeiro, Brazil (21 October 1998). (g) Simoxenops ucayalae: natural song. Serra dos Carajas. Para. Brazil (9 February 2003). (h) Simoxenops ucayalae: long song in response to playback. Alta Floresta, Mato Grosso, Brazil (25 August 1991). (i) Simoxenops ucayalae: single-note call, Alta Floresta, Mato Grosso, Brazil (25 August 1991). All recordings by K. J. Zimmer. All spectrograms by P. R. Isler. than the loudsongs of P. dimidiatum or Syndactyla, but varied similarly in overall song-length ( seconds), frequency shifts and in changes of pace (acceleration and deceleration) between songs from the same individual. Like P. dimidiatum and the Syndactyla species, this variation was subject to influence by playback and the degree of agitation of the responding bird. In contrast to the three Syndactyla species, the loudsongs of Simoxenops ucayalae typically accelerated more markedly over the first part of the song and slowed at the end, but still ended abruptly. In this respect, they were more similar to loudsongs of P. dimidiatum. which often commenced with a preamb
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