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Regulation of Reproduction in the Primitively Eusocial Wasp Ropalidia marginata: on the Trail of the Queen Pheromone

Bhadra, Anindita and Mitra, Aniruddha and Deshpande, Sujata A and Chandrasekhar, Kannepalli and Naik, Dattatraya G and Hefetz, Abraham and Gadagkar, Raghavendra (2010) Regulation of Reproduction in the Primitively Eusocial Wasp Ropalidia marginata: on the Trail of the Queen Pheromone. In: Journal of Chemical Ecology, 36 (4). pp. 424-431.

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Queens and workers are not morphologically differentiated in the primitively eusocial wasp, Ropalidia marginata. Upon removal of the queen, one of the workers becomes extremely aggressive, but immediately drops her aggression if the queen is returned. If the queen is not returned, this hyper-aggressive individual, the potential queen (PQ), will develop her ovaries, lose her hyper-aggression, and become the next colony queen. Because of the non-aggressive nature of the queen, and because the PQ loses her aggression by the time she starts laying eggs, we hypothesized that regulation of worker reproduction in R marginata is mediated by pheromones rather than by physical aggression. Based on the immediate loss of aggression by the PQ upon return of the queen, we developed a bioassay to test whether the queen's Dufour's gland is, at least, one of the sources of the queen pheromone. Macerates of the queen's Dufour's gland, but not that of the worker's Dufour's gland, mimic the queen in making the PQ decrease her aggression. We also correctly distinguished queens and workers of R. marginata nests by a discriminant function analysis based on the chemical composition of their respective Dufour's glands.

Item Type: Journal Article
Publication: Journal of Chemical Ecology
Publisher: Springer
Additional Information: Copyright of this article belongs to Springer.
Keywords: Ropalidia marginata;Queen pheromone;Potential queen;Dufour's gland;Reproductive monopoly
Department/Centre: Division of Biological Sciences > Centre for Ecological Sciences
Date Deposited: 08 Jun 2010 06:14
Last Modified: 19 Sep 2010 06:00
URI: http://eprints.iisc.ac.in/id/eprint/27250

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