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Loud calls: contextual differences in structure and response of group mates (Master thesis of Christof Neumann, University of Leipzig/German Primate Centre, completed September 2007) |
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In many primate species male individuals produce vocalizations that can be heard over a long distance (loud or long calls). Results of a recent meta-analysis suggest that these calls serve different purposes in different species. In Sulawesi crested black macaques loud calls are emitted in a variety of contexts including agonistic interactions and mating, but also socially neutral behaviour. The aim of this study was to examine individual and contextual differences in call structure by detailed sound analysis. Behavioural observations helped clarifying individual and context depending differences in frequency of call utterance. With playback experiments, we tested how group mates differ in their response to the calls. |
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