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Network approach to understanding the organization of and the consequence of targeted leader removal on an end-oriented task

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Current Zoology 2017年第3期63卷 269-277页

作者： sumana annagiri Swetashree KOLAY Bishwarup PAUL Chandan SONA Behaviour & Ecology Lab Department of Biological Sciences Indian Institute of Science Education and Research Kolkata Mohanpur West Bengal 741246 India Department of Pharmacology CSIR-CDRI Jankipurm Vistar Lucknow Uttar Pradesh 226021 India

Relocation is an important event in the lives of several social insects whereby all colony members have to be transferred to a new nest when conditions in the old nest become unfavorable. In the current study, network tools were used to examine the organization of this goal-oriented task in the Indian queenless ant Diacamma indicum Which relocate their colonies by means of tandem running. Individual ants were used as nodes and tandem runs as directed edges to construct unweighted networks. Network parameters were characterized in control relocations （CRs） and in relocations where the node with the highest outdegree, that is, the Maximum tandem leader （Max TL） was experimentally removed. These were then compared to 1） randomized networks, 2） simu- lated networks in which Max TL was removed, and 3） simulated networks with removal of a random leader. Not only was there complete recovery of the task, but the manner in which it was organized when Max TL was removed was comparable to CRs. The results obtained from our empirical study were significantly different from the results predicted by simulations of leader removal. At an individual level, the Max TL had a significantly higher outdegree than expected by chance alone and in her absence the substitute Max TL did comparable work. In addition, the position of the Max TL in the pathway of information flow was conserved in control and experimentally manipulated conditions. Understanding the organization of this critical event as more than the sum of individual interactions using network parameters allows us to appreciate the dynamic response of groups to perturbations.

关键词： Diacamma indicum division of labor networks relocation tandem running

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