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Rank dependant differences in frequency and acoustic structure of loud calls (Gholib Assahad, Bogor Agricultural University, completed March 2008) |
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In contrast to other male macaques, all adult male Sulawesi crested black macaques utter loud calls. It is thus very likely that in this species loud calls serve a function in inter- and/or intra-sexual selection, i.e. function to attract fertile females and/or play a role for male-male competition. The aim of this study was to investigate the relationship between male dominance rank and the frequency and acoustic structure of loud calls. In addition, we examined response of group mates to calls. We combined behavioural observations with sound analysis and playback experiments. |
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