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- W2340233735 abstract "Plant selection in leaf-cutting ants is not solely based on innate or learned preferences by foragers, but also on their previous experience with plants that have harmful effects on their symbiotic fungus. Foragers learn to avoid plants harmful for the fungus, albeit harmless for themselves. Since harvested leaves are processed inside the nest, it is an open question whether gardeners and midden workers also participate in the process of plant selection, for instance by learning to reject leaves that proved to be unsuitable for the fungus. Besides occasional observations of fresh leaf fragments in the waste dump, nothing is known about how unsuitable plants already harvested are handled inside the nest. To investigate plant avoidance by gardeners and midden workers, we quantified the dynamics of leaf processing and disposal in laboratory subcolonies of Acromyrmex ambiguus during and after having offered them fungicide-treated leaves over 3 days. Control subcolonies received water-treated leaves. Both foraging and processing of fungicide-treated leaves dramatically decreased after 24 h, indicating that learned responses were involved. By this time, midden workers handled leaf fragments as waste and transported them to the waste chamber. On day 4, we asked whether foragers, gardeners and midden workers had learned to avoid plants in a species-specific way, by offering them a choice between untreated leaves of the previously treated plant and untreated leaves of an alternative plant at their worksites. They all rejected the plant previously experienced as harmful for the fungus, indicating that delayed avoidance inside the nest represents an additional step of quality control to preserve the garden from noxious plants that may have qualified as suitable for foragers. We discuss how plant material that is discarded as waste may provide a source of information about plant suitability inside the colony." @default.
- W2340233735 created "2016-06-24" @default.
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- W2340233735 date "2016-05-01" @default.
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- W2340233735 title "Gardeners and midden workers in leaf-cutting ants learn to avoid plants unsuitable for the fungus at their worksites" @default.
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- W2340233735 doi "https://doi.org/10.1016/j.anbehav.2016.03.016" @default.
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