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Social mutilation in the Ponerine ant Diacamma: cues originate in the victims

Ramaswamy, K and Peeters, C and Yuvana, SP and Varghese, T and Pradeep, HD and Dietemann, V and Karpakakunjaram, V and Cobb, M and Gadagkar, R (2004) Social mutilation in the Ponerine ant Diacamma: cues originate in the victims. In: Insectes Sociaux, 51 (4). pp. 410-413.

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In the queenless ponerine ant genus Diacamma, all workers eclose with a pair of innervated thoracic appendages termed gemmae. The gamergate (= mated egg laying worker) maintains reproductive monopoly by mutilating the gemmae of all eclosing individuals. Such mutilation leads to irreversible behavioural and neurological changes such that the individual lacking gemmae becomes incapable of appropriate sexual calling and mating. In one population related to Diacamma ceylonense from India, Diacamma sp. from Nilgiri (hereafter referred to as nilgiri), gamergates do not mutilate their nestmates and yet maintain reproductive monopoly. To understand what triggers mutilation, we exchanged cocoons between the mutilating D. ceylonense colonies and the non mutilating nilgiri colonies. 'nilgiri' callows were not mutilated even in D. ceylonense colonies while D. ceylonense callows were mutilated even in 'nilgiri' colonies, suggesting that the cues for mutilation originate in the victims (callows), presumably in the gemmae themselves. This finding should facilitate understanding the proximate mechanism and evolutionary significance of mutilation of gemmae as a method of resolution of reproductive conflicts in the genus Diacamma.

Item Type: Journal Article
Publication: Insectes Sociaux
Publisher: Birkhäuser Basel
Additional Information: Copyright of this article belongs to Birkhäuser Basel.
Keywords: Diacamma;Queenless ponerine ants;Social mutilation;Gemmae; Cocoon exchange
Department/Centre: Division of Biological Sciences > Centre for Ecological Sciences
Date Deposited: 28 Nov 2006
Last Modified: 19 Sep 2010 04:32
URI: http://eprints.iisc.ac.in/id/eprint/8713

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