摘要: When they are flying,Great evening bat ( Ia io ) produces short FM echolocation calls including three harmonics,of which the first one and the second one are stronger.As they fly,the first harmonic is modulated from 49 0 to 18 3 kHz,the second one is modulated from 80 0 to 35 6 kHz,and the third one from 87 2 to 56 7 kHz.The average duration of the calls is 3 7 ms.It was predicted that Great evening bat ( Ia io ) captures big insects in the open area among foliages according to the sound characteristic analysis of echolocation calls and the analysis comparing with the echolocation calls of other bats that perch in the same cave.

摘要: 2005年11月和2006年5、7、9月在贵州兴义研究了南蝠(Iaio)的食性。通过对南蝠粪便分析,发现7、9和11月份,鸟的残留羽毛在粪便中占很大比例,尤其是在11月份,鸟的羽毛占了食物组成的82%(体积百分比,下同),结果证实南蝠是一种食鸟蝙蝠。但在5月份的粪便中未发现鸟毛,而鞘翅目所占比例很大(85%);7和9月份,鸟的羽毛和鞘翅目残遗物所占的比例相当(7月份分别为44.6%和48.7%;9月份分别为51.1%和43.4%)。5、7、9、11月份南蝠取食鸟类的比例逐渐增加,而对鞘翅目的取食则逐渐减少。除取食鞘翅目外,南蝠还捕食鳞翅目、半翅目、直翅目和膜翅目等昆虫。对比捕食区内潜在的食物,发现南蝠对部分昆虫表现出明显的选择性,说明南蝠为选择性捕食者。