Antennation of nectar-receivers encodes colony needs and food-source profitability in the ant Camponotus mus |
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Authors: | S Mc Cabe W M Farina R B Josens |
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Institution: | (1) Grupo de Estudio de Insectos Sociales, Departamento de Biodiversidad y Biología Experimental, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria (C1428EHA), Buenos Aires, Argentina |
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Abstract: | In social insects, interactions among individuals are important in colony organisation because they can be used in decision
making. During trophallaxis in ants, antennal and foreleg contacts between both partners are established. It has been suggested
that a modulatory communication channel could be involved in such contacts, but it remains undemonstrated. The aim of this
work was to find variables plausible to be encoded in such contacts and quantify the consequent changes in the tactile stimulation
the food-donor ant receives. We recorded nectar transference between pairs of workers in experimental arenas once one of them
had returned from collecting sucrose solution (15 or 40%w/w), with different situations of colony’s sugar deprivation. The
frequency of antennal strokes that the food-donor ant received on her head depended on both the colony’s sugar-deprivation
and the concentration, the latter showed differences within 3–5 deprivation days. Antennal and foreleg movements of the food-receiver
increase with increasing level of colony’s carbohydrate deprivation, as well as with increasing concentration of the transferred
food. Not only does this study reopen an interesting question, but it gives evidence that variables related to the appetitive
context are indeed encoded in the tactile stimulation during the trophallaxis as well. Consequently, they have the effective
potentiality to play a communicational role in the organization of colony activities.
Received 22 December 2005; revised 5 April 2006; accepted 12 April 2006. |
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Keywords: | Camponotus mus ants trophallaxis foraging antennation |
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