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First published online December 22, 2003
Journal of Experimental Biology 207, 443-448 (2004)
Published by The Company of Biologists 2004
doi: 10.1242/jeb.00768

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Acoustic communication in noise: regulation of call characteristics in a New World monkey

Henrik Brumm^*, Katrin Voss, Ireen Köllmer and Dietmar Todt

Freie Universität Berlin, Institut für Biologie, Verhaltensbiologie, Haderslebener Str. 9, 12163 Berlin, Germany

View larger version (8K): [in a new window]   Fig. 1. Spectrogram of a common marmoset twitter call comprising eight syllables.

View larger version (16K): [in a new window]   Fig. 2. Regulation of the call level by common marmosets. Each data point represents the median value of one twitter call series (dB re. 20 µPa). (A) Female: rs=0.904, N=14, Pc<0.001; (B) Male 1: rs=0.887, N=12, Pc<0.01; (C) Male 2: rs=0.816, N=11, Pc<0.01; (D) Male 3: rs=0.935, N=9, Pc<0.01.

View larger version (16K): [in a new window]   Fig. 3. Regulation of the call syllable duration by common marmosets. Each data point represents the median value of one twitter call series (dB re. 20 µPa). (A) Female: rs=0.718, N=20, Pc<0.001; (B) Male 1: rs=0.838, N=14, Pc<0.01; (C) Male 2: rs=0.924, N=14, Pc<0.0001; (D) Male 3: rs=0.829, N=9, Pc<0.05.

View larger version (17K): [in a new window]   Fig. 4. Number of syllables per call series produced by common marmosets in relation to the background noise level (dB re. 20 µPa). (A) Female: rs=0.218, N=20, Pc=0.725; (B) Male 1: rs=0.409, N=14, Pc=0.383; (C) Male 2: rs=0.285, N=14, Pc=0.689; (D) Male 3: rs=–0.144, N=9, Pc=0.9919.