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Title: Copy if dissatisfied, innovate if not: contrasting egg-laying decision making in an insect
Authors: Otake, Ryoga
Dobata, Shigeto
Author's alias: 大竹, 遼河
土畑, 重人
Keywords: Insect cognition
Scent marking
Seed beetle
Information cascade
Issue Date: Nov-2018
Publisher: Springer Berlin Heidelberg
Journal title: Animal Cognition
Volume: 21
Issue: 6
Start page: 805
End page: 812
Abstract: The use of conspecific cues as social information in decision making is widespread among animals; but, because this social information is indirect, it is error-prone. During resource acquisition, conspecific cues also indicate the presence of competitors; therefore, decision makers are expected to utilize direct information from resources and modify their responses to social information accordingly. Here, we show that, in a non-social insect, unattractive egg-laying resources alter the behavioural response to conspecific cues from avoidance to preference, leading to resource sharing. Females of the adzuki bean beetle Callosobruchus chinensis avoid laying eggs onto beans that already have conspecific eggs. However, when we provided females with bean-sized clean glass beads with and without conspecific eggs, the females preferred to add their eggs onto the beads with eggs. The glass beads, once coated with water extracts of adzuki beans, enabled the females to behave as if they were provided with the beans: the females preferred bean-odoured glass beads to clean glass beads and they avoided the substrates with eggs. When females are provided with unattractive egg-laying substrates only, joining behaviour (i.e. copying) might be advantageous, as it takes advantage of information about positive attributes of the substrate that the focal animal might have missed. Our results suggest that given only unsatisfactory options, the benefits of copying outweigh the costs of resource competition. Our study highlights the importance of integrating multiple information sources in animal decision making.
Description: 昆虫の産卵意思決定における他者情報の活用規則を発見 --物足りないなら模倣せよ、充たされたなら革新せよ--. 京都大学プレスリリース. 2018-09-14.
Rights: This is a post-peer-review, pre-copyedit version of an article published in Animal Cognition. The final authenticated version is available online at:
The full-text file will be made open to the public on 30 August 2019 in accordance with publisher's 'Terms and Conditions for Self-Archiving'.
This is not the published version. Please cite only the published version. 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。
DOI(Published Version): 10.1007/s10071-018-1212-0
PubMed ID: 30167927
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