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Honeybees learn floral odors while receiving nectar from foragers within the hive
Authors:Walter M Farina  Christoph Grüter  Luis Acosta  Sofía Mc Cabe
Institution:(1) Departamento de Biodiversidad y Biología Experimental, Facultad de Ciencias Exactas y Naturales, Grupo de Estudio de Insectos Sociales, IFIBYNE-CONICET, Universidad de Buenos Aires, Pabellón II, Ciudad Universitaria (C1428EHA), Buenos Aires, Argentina;(2) Division of Behavioural Ecology, University of Bern, Ethologische Station Hasli, Wohlenstrasse 50a, 3032 Hinterkappelen, Switzerland
Abstract:Recent studies showed that nectar odors brought back by honeybee foragers can be learned associatively inside the hive. In the present study, we focused on the learning abilities of bees, which directly interact via trophallaxis with the incoming nectar foragers: the workers that perform nectar-receiving tasks inside the hive. Workers that have received food directly from foragers coming back from a feeder offering either unscented or scented sugar solution phenylacetaldehyde (PHE) or nonanal diluted] were captured from two observational hives, and their olfactory memories were tested using the proboscis extension response paradigm. Bees that have received scented solution from incoming foragers showed significantly increased response frequencies for the corresponding solution odor in comparison with those that have received unscented solution. No differences in the response frequencies were found between food odors and colonies. The results indicate that first-order receivers learn via trophallaxis the association between the scent and the sugar solution transferred by incoming foragers. The implications of these results should be considered at three levels: the operational cohesion of bees involved in foraging-related tasks, the information propagation inside the hive related to the floral type exploited, and the putative effect of these memories on future preferences for resources.
Keywords:Honeybees  Floral odorants  Foragers  Phenylacetaldehyde  Nonanal
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