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Dawn chorusing in guereza colobus monkeys

Anne Marijke Schel & Klaus Zuberbühler

Résumé Dawn chorusing by guereza black-and-white colobus monkeys is one of the most impressive spectacles of African rainforests. This vocal behaviour is highly contagious, travelling from one neighbouring group to the next, until a wide forest area is covered by calling monkeys. Chorusing usually occurs up to 2 h before dawn, sometimes more than once, unless the preceding night was cold and wet. We conducted a series of playback experiments, which showed that guerezas' chorusing was difficult to elicit experimentally, suggesting that callers took several variables into account before responding to other monkeys' predawn calls. Acoustic analyses showed that morning calls were individually distinct, but we found no evidence that callers took individual identity into account in their decision to participate in chorusing. The only way to reliably elicit chorusing in our study area was to broadcast recordings of morning choruses for longer than 30 s and at a time when a chorus simultaneously emerged in a distant part of the forest.
   
Citation Schel, A. M., & Zuberbühler, K. (2012). Dawn chorusing in guereza colobus monkeys. Behavioral Ecology and Sociobiology, 66(3), 361-373.
   
Type Article de périodique (Anglais)
Date de publication 2012
Nom du périodique Behavioral Ecology and Sociobiology
Volume 66
Numéro 3
Pages 361-373