%0 Journal Article %A CUI Liangwei %A FAN Pengfei %A FEI Hanlan %A FENG Junjuan %A MA Changyong %T Call sonograms of eastern black crested gibbon (Nomascus nasutus) %D 2013 %R %J ACTA THERIOLOGICA SINICA %P 203-214 %V 33 %N 3 %X We used a Sony TC - D5 Pro2 recorder,a Sony C - 76 directed microphone and a Sony tape recorder to record call bouts of three groups of eastern black crested gibbons (Nomascus nasutus)from September 2007 to June 2009 in Bangliang Nature Reserve,Guangxi. Signal/ RTS 4.0 was used to analyze the sonograms of five high quality bouts for each group. Call frequency of eastern black crested gibbon was quite high,sometimes reaching or exceeding 5 kHz. Adult males produced boom,aa notes,pre-modulated notes and modulated phrases,whereas adult females produced great calls.Adult males and mated females coordinated to produce complex duets,which usually began with and ended with the male call. We also compared the duet structure of eastern black crested gibbon with western black crested gibbon (N. concolor) and Hainan gibbon (N. hainanus ). Both male and female calls and their coordinated duet sequences showed obvious differences between the three species. Sonogram characters,based on our results,therefore support the division of these groups of Nomascus into the current three species. %U http://www.mammal.cn/EN/abstract/article_2932.shtml