关键词: 东黑冠长臂猿, 鸣叫, 时间特征, 气象因子

Abstract: Gibbons are characterized by their species-specific calls,which are known to be affected by both biotic and abiotic factors (such as meteorological factors). To identify the effects of meteorological factors on the singing behavior of eastern black crested gibbons (Nomascus nasutus),we monitored three groups in Bangliang Nature Reserve,Guangxi,from August 2008 to October 2009 using all-occurrence recording. Groups sang during 69.7% of days monitored,and sang an average of 1.24 bouts per singing day. Over 90% of the songs were produced between 30 minutes before and three hours after the sunrise. The average duration of the songs was 18. 3 min,and females produced 4. 4 great calls/ duet bout. Gibbons called later relative to sunrise on foggy days than on cloudy or sunny days. They produced shorter bouts and called later on rainy days, presumably because the energy loss and weaker solar radiation. We detected no effect of temperature on singing behavior.

Key words: Eastern black crested gibbon (Nomascus nasutus), Meteorological factors, Timing, Vocalization