Journal of Chemical Ecology

, Volume 28, Issue 12, pp 2585–2600

Semiochemicals Released by Electrically Stimulated Red Imported Fire Ants, Solenopsis invicta

  • R. K. Vander Meer
  • T. J. Slowik
  • H. G. Thorvilson


The red imported fire ant Solenopsis invicta Buren, has evolved sophisticated chemical communication systems that regulate the activities of the colony. Among these are recruitment pheromones that effectively attract and stimulate workers to follow a trail to food or alternative nesting sites. Alarm pheromones alert, activate, and attract workers to intruders or other disturbances. The attraction and accumulation of fire ant workers in electrical equipment may be explained by their release of pheromones that draw additional worker ants into the electrical contacts. We used chemical analysis and behavioral bioassays to investigate if semiochemicals were released by electrically shocked fire ants. Workers were subjected to a 120 V, alternating-current power source. In all cases, electrically stimulated workers released venom alkaloids as revealed by gas chromatography. We also demonstrated the release of alarm pheromones and recruitment pheromones that elicited attraction and orientation. Arrestant behavior was observed with the workers not electrically stimulated but near those that were, indicating release of unkown behavior-modifying substances from the electrically stimulated ants. It appears that fire ants respond to electrical stimulus by generally releasing exocrine gland products. The behaviors associated with these products support the hypothesis that the accumulation of fire ants in electrical equipment is the result of a foraging worker finding and closing electrical contacts, then releasing exocrine gland products that attract other workers to the site, who in turn are electrically stimulated.

Semiochemicals pheromones alarm attraction electric field fire ant behavior recruitment 


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Copyright information

© Plenum Publishing Corporation 2002

Authors and Affiliations

  • R. K. Vander Meer
    • 1
  • T. J. Slowik
    • 2
  • H. G. Thorvilson
    • 2
  1. 1.United States Department of Agriculture—Agricultural Research Service, Center for MedicalAgricultural and Veterinary EntomologyFloridaUSA
  2. 2.Texas Tech UniversityLubbockUSA

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