Insectes Sociaux

, Volume 53, Issue 2, pp 220–225 | Cite as

Social and ecological contexts of trophallaxis in facultatively social sweat bees, Megalopta genalis and M. ecuadoria (Hymenoptera, Halictidae)

  • W. T. WcisloEmail author
  • V. H. Gonzalez
Research article


Exchange of liquid food among adults (trophallaxis) is documented for the first time in New World sweat bees (Halictinae). Megalopta genalis and M. ecuadoria are facultatively social, and in social groups foragers regularly give food to the oldest resident female bee, which dominates social interactions. In turn, the oldest resident sometimes re-distributes this food, and shares it with younger foragers. Food is sometimes offered freely, but often the dominant bee exhibits escalating aggressive behavior until she is fed, whereupon she immediately ceases to be aggressive. The occurrence of trophallaxis in a species with mass-provisioned larvae provides an opportunity to examine the ritualization of social behavior. Trophallaxis also increases survivorship of males and females by almost 50% under experimental conditions, suggesting the behavior is also important in ecological contexts.


Trophallaxis ritualization sociality Megalopta Halictidae 


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Copyright information

© Birkhäuser Verlag, Basel 2006

Authors and Affiliations

  1. 1.Smithsonian Tropical Research InstituteApartadoRepublic of Panama
  2. 2.Department of Ecology & Evolutionary BiologyUniversity of KansasLawrenceUSA
  3. 3.Unit 0948APO AAUSA

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