Species differences of male loud calls and their perception in sulawesi macaques |
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Authors: | Yasuyuki Muroyama Bernard Thierry |
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Institution: | (1) Present address: Forestry and Forest Products Research Institute, Kansai Research Center, Momoyama, Fushimi, 612-0855 Kyoto, Japan;(2) Present address: Laboratoire d'Ethologie et Neurobiologie, CNRS (URA 1295), Université Louis Pasteur, 7 rue de l'Université, 67000 Strasbourg, France |
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Abstract: | Playback experiments were conducted to investigate interspecific discrimination of male loud calls in Sulawesi macaques. Loud
calls of four macaque species living in Sulawesi (Macaca tonkeana, M. maurus, M. hecki, andM. nigrescens) and a control stimulus (an 8-sec frequency modulated sound) were played back to semi-free-ranging Tonkean macaques (M. tonkeana). A preliminary acoustic analysis indicated that the calls of these four species differ in some spectral and temporal features.
In the playback experiments, Tonkean macaques responded in a similar manner to conspecific calls and calls of two other species,M. maurus andM. hecki. In contrast, animals responded more weakly to the call ofM. nigrescens and the control stimulus. Males responded more strongly than females to all stimuli, while females appeared to be more discriminating
for species differences than males. Analyses on the acoustic features of loud calls suggested that high frequency, wide frequency
range, and repetition of sound units at a high rate elicit quick responses from animals. |
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Keywords: | Communication Signal Macaca tonkeana Playback experiments Interspecies differences |
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