Trophallaxis

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Trophallaxis in Asian-Australian weaver ant O. smaragdina, Thailand.
Trophallaxis in Asian-Australian weaver ant O. smaragdina, Thailand.

Trophallaxis is the transfer of food or other fluids among members of a community through mouth-to-mouth (stomodeal) or anus-to-mouth (proctodeal) feeding. It is most highly developed in social insects such as ants, termites and bees. The word was introduced by the entomologist William Morton Wheeler in 1918.[1] The behaviour was used in the past to support theories on the origin of sociality in insects.[2]

In ants, individual colony members store food in their crops and regularly exchange it with other colony members and larvae to form a sort of "communal stomach" for the colony. In termites and cockroaches,[3] proctodeal trophallaxis is crucial for replacing the gut endosymbionts that is lost after every molt. This should not be confused with coprophagia. Some vertebrates such as birds also feed their young through trophallaxis.

Trophallaxis is also performed by members of the dog family. In the wild, a hunting dog will regurgitate food gorged while far from its lair in order to feed its puppies. These puppies lick the face of the adult in order to trigger trophallaxis. Domestic dogs are tame because of arrested development of their wild tendencies and will treat certain humans, in particular their owner, as lifelong 'parents'. Therefore, when a dog licks your face, it may be that he's manifesting a vestigial feeding instinct.

Trophallaxis serves as a means of communication, at least in bees and ants. In some species of ants, it may play a role in spreading the colony odour that identifies members.[4]

[edit] References

  1. ^ Wheeler, W. M. 1918. A study of some ant larvae with a consideration of the origin and meaning of social habits among insects. Proc. Am. Phil. Soc., 57, 293-343.
  2. ^ Roubaud E (1916) Recherches biologiques sur les guepes solitaires et sociales d'Afrique. La genese de la vie sociale et l'evolution de l'instinct maternel chez les vespides. Ann Sci Nat 1:1-160
  3. ^ Kitade, Osamu 2004. Comparison of Symbiotic Flagellate Faunae between Termites and a Wood-Feeding Cockroach of the Genus Cryptocercus. Microbes and Environments. 19(3):215-220 full text
  4. ^ Dahbi, A.;Hefetz, A. Cerda, X. and Lenoir, A. 1999. Trophallaxis mediates uniformity of colony odor in Cataglyphis iberica ants (Hymenoptera, Formicidae) Journal of insect behavior. 12(4):559-567 abstract