Journal of Chemical Ecology

, Volume 27, Issue 9, pp 1805–1819 | Cite as

Task-Related Environment Alters the Cuticular Hydrocarbon Composition of Harvester Ants

  • Diane Wagner
  • Madeleine Tissot
  • Deborah Gordon

Abstract

Within a colony of harvester ants (Pogonomyrmex barbatus), workers in different task groups differ in the hydrocarbon composition of the cuticle. Foragers and patrollers, which spend extended periods of time outside the nest, have a higher proportion of saturated, unbranched hydrocarbons (n-alkanes) on the cuticle than nest maintenance workers, which spend only short periods of time outside the nest. We tested whether these task-related differences in ant cuticular chemistry arise from exposure to conditions outside the nest. Nest maintenance workers experiencing daily, short-term outside exposure developed a higher proportion of n-alkanes on the cuticle than workers kept inside the lab. Independent manipulations of ultraviolet radiation, relative humidity, and temperature revealed that only the combination of high temperature (ca. 38°C) and low relative humidity (ca. 8%) increased the proportion of cuticular n-alkanes. The results indicate that warm dry conditions, such as those encountered when an ant leaves the nest, trigger changes in cuticular chemistry.

Cuticular hydrocarbons Formicidae Pogonomyrmex barbatus n-alkanes task 

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Copyright information

© Plenum Publishing Corporation 2001

Authors and Affiliations

  • Diane Wagner
    • 1
  • Madeleine Tissot
    • 2
  • Deborah Gordon
    • 2
  1. 1.Department of Biological SciencesUniversity of NevadaLas VegasUSA
  2. 2.Department of Biological SciencesStanford UniversityStanford

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