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Title: Social significance of trunk use in captive Asian elephants
Authors: Yasui, Saki
Idani, Gen’ichi
Author's alias: 伊谷, 原一
Keywords: Asian elephant
touch with trunk
function
affiliative
aggressive
Issue Date: 4-Jul-2017
Publisher: Taylor & Francis Group
Journal title: Ethology Ecology & Evolution
Volume: 29
Issue: 4
Start page: 330
End page: 350
Abstract: Tactile behaviour plays an important role in maintaining social relationships in several mammalian species. Touching with the tip of the trunk is a common social behaviour among Asian elephants (Elephas maximus). This is considered an affiliative behaviour; however, few studies have investigated it in detail. Therefore, this study aimed to determine whether this is an affiliative behaviour and whether it has other functions. We directly observed a group of captive female Asian elephants in Thailand. We found that the elephants usually touched each other with their trunks shaped in a U (U-type) or S (S-type) shape. The S-type shape was observed mainly when the elephants touched the lips of other elephants; however, this behaviour was occasionally observed in agonistic or play contexts, where it appeared to be a threat or dominant behaviour, particularly amongst adults. In contrast, the U-type shape was more frequently observed when the elephants were disturbed, where it appeared as a gesture for reassurance. We found that the U-type touch on the genitals may be used for interacting with neonates. Therefore, we suggest that despite the S-type touch having a tactile component, it may be a rare behaviour in Asian elephants that is similar to visual threat displays in other mammals. However, the U-type touch is similar to social grooming behaviour in primates or flipper rubbing in dolphins, and can be used as an indicator of affiliative relationships. Asian elephants change the shape of their trunk while touching others depending on their motivation and the situation, thereby demonstrating that the nuances of trunk use can assist in understanding the social relationships between individuals.
Rights: This is an Accepted Manuscript of an article published by Taylor & Francis in 'Ethology Ecology & Evolution' on 2017, available online: https://www.tandfonline.com/ 10.1080/03949370.2016.1179684 .
The full-text file will be made open to the public on 04 July 2018 in accordance with publisher's 'Terms and Conditions for Self-Archiving'.
この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。
This is not the published version. Please cite only the published version.
URI: http://hdl.handle.net/2433/228270
DOI(Published Version): 10.1080/03949370.2016.1179684
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