Trail pheromone of ponerine ant Gnamptogenys striatula: 4-Methylgeranyl esters from Dufour's gland

Rumsaïs Blatrix, Claudia Schulz, Pierre Jaisson, Wittko Francke, Abraham Hefetz

Research output: Contribution to journalArticlepeer-review

Abstract

Dufour's gland is the origin of the trail pheromone of Gnamptogenys striatula. Chemical analysis of the glandular extracts revealed a series of new natural products, especially esters of (2E)-3,4,7-trimethyl-2,6-octadien-1-ol (4-methylgeraniol), and (2E)-3,4,7-trimethyl-2,6-nonadien-1-ol (a bishomogeraniol isomer) with medium-chain fatty acids. Bioassays with synthetic racemates of the esters revealed that the 4-methylgeranyl esters are highly active as trail pheromones, while the bishomogeranyl esters are either marginally active or not active at all. Assays with the individual 4-methylgeranyl esters showed each of them to be inferior to the glandular secretion in eliciting trail following. However, the mixture of racemic 4-methylgeranyl octanoate and the corresponding decanoate and dodecanoate, the main Dufour's volatile constituents, is as active as the natural secretion at similar concentration. We conclude that the trail pheromone constitutes a mixture of at least the 4-methylgeranyl esters identified in the gland. Since G. striatula generally preys on small arthropods rather than monopolizing large resources, we assume that trails are rarely used during foraging, but more often during nest migration. Production of new societies in this species is generally performed by budding, a period of considerable predation risk. Utilizing trails for efficient displacement in this context is, therefore, highly adaptive. This behavioral repertoire may also provide the ants with additional means of food resource exploitation.

Original languageEnglish
Pages (from-to)2557-2567
Number of pages11
JournalJournal of Chemical Ecology
Volume28
Issue number12
DOIs
StatePublished - 1 Dec 2002

Keywords

  • 4-methylgeranyl esters
  • Dufour's gland
  • Gnamptogenys
  • Trail pheromones

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