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This study examines whether a group of captive false killer whales (Pseudorca crassidens ) showed variations in the vocal rate around feeding times. The high level of motivation to express appetitive behaviors in captive animals may lead them to respond with changes of the behavioral activities during the time prior to food deliveries which are referred to as food anticipatory activity. False killer whales at Qingdao Polar Ocean World (Qingdao, China) showed significant variations of the rates of both the total sounds and sound classes (whistles, clicks, and burst pulses) around feedings. Precisely, from the Transition interval that recorded the lowest vocalization rate (3.40 s/m/d), the whales increased their acoustic emissions upon trainers’ arrival (13.08 s/m/d). The high rate was maintained or intensified throughout the food delivery (25.12 s/m/d), and then reduced immediately after the animals were fed (9.91 s/m/d). These changes in the false killer whales sound production rates around feeding times supports the hypothesis of the presence of a food anticipatory vocal activity. Although sound rates may not give detailed information regarding referential aspects of the animal communication it might still shed light about the arousal levels of the individuals during different social or environmental conditions. Further experiments should be performed to assess if variations of the time of feeding routines may affect the vocal activity of cetaceans in captivity as well as their welfare. 相似文献
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日本国水族馆海豚的饲养与繁殖技术 总被引:1,自引:0,他引:1
日本国四面临海,海洋生物资源十分丰富,其近海分布的鲸类有44种[2],占世界鲸类种数的45%。日本国的特殊地理位置和日本人独特的海食文化,使其捕鲸业在古代就非常发达。二战以后,为了寻求更多的食物资源,日本的捕鲸业更是得到了长足的发展,直至今天,日本仍是国际捕鲸委员会(IWC)中少数几个反对全面禁止捕鲸的成员国之一[7]。今天的大多数日本水族馆不仅展示鱼类,还展示小型鲸类等海洋哺乳动物,主要是海豚。他们在海豚的饲养、训练和繁殖等方面积累了丰富的经验。1992年1月至4月,作者受日本国际协力事业团(JICA)的资助,参… 相似文献
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