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Leaf-cutting ants learn to identify unsuitable plants from cues within the colony

Waste from fungicide-treated privet leaves is enough to make foraging ants avoid this plant

Date:
March 8, 2017
Source:
PLOS
Summary:
Leaf-cutting ants can learn which plants are not suitable for the fungus gardens that supply their food before they even leave the colony, according to a study.
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Leaf-cutting ants learn to identify unsuitable plants from cues within the colony.
Credit: Erik Frank

Leaf-cutting ants can learn which plants are not suitable for the fungus gardens that supply their food before they even leave the colony, according to a study published March 8, 2017 in the open-access journal PLOS ONE by Andrés Arenas and Flavio Roces from University of Wurzburg, Germany.

Leaf-cutting ants harvest leaf fragments and carry them back to their nests, using them to grow a symbiotic fungus that is their main source of food. If a plant proves unsuitable for the fungus garden, however, ants stop collecting it. Arenas and Roces had previously shown that foragers learned to avoid plants not suited to fungus gardens even if they had not been directly exposed to the plants or their effects on the fungus. To find out how the ants learned to identify unsuitable plants, the researchers exposed naïve foragers to waste from fungus gardens that contained fungicide-treated privet leaves. Specifically, they established two colonies of 1,000 worker ants in the lab, and fed fungicide-treated privet leaves to one colony and untreated leaves to the second. Then they exposed the naïve ants in the second colony to waste from the first one.

The researchers found that waste from fungicide-treated privet leaves made naïve ants avoid foraging on privets. This shows that cues within the colony's waste dump are enough for ants to learn which plants are not suited to their fungus gardens. Additionally, 35% of the ants that had foraged the previous day visited the waste dump, which is more than previously thought and has implications for social learning in leaf-cutting ants.

"Besides the undesirable effect of waste, waste particles carry information that foraging ants use outside the nest when selecting plants for their symbiotic fungus," says Arenas.


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Journal Reference:

  1. Andrés Arenas, Flavio Roces. Avoidance of plants unsuitable for the symbiotic fungus in leaf-cutting ants: Learning can take place entirely at the colony dump. PLOS ONE, 2017; 12 (3): e0171388 DOI: 10.1371/journal.pone.0171388

Cite This Page:

PLOS. "Leaf-cutting ants learn to identify unsuitable plants from cues within the colony: Waste from fungicide-treated privet leaves is enough to make foraging ants avoid this plant." ScienceDaily. ScienceDaily, 8 March 2017. <www.sciencedaily.com/releases/2017/03/170308144722.htm>.
PLOS. (2017, March 8). Leaf-cutting ants learn to identify unsuitable plants from cues within the colony: Waste from fungicide-treated privet leaves is enough to make foraging ants avoid this plant. ScienceDaily. Retrieved May 26, 2017 from www.sciencedaily.com/releases/2017/03/170308144722.htm
PLOS. "Leaf-cutting ants learn to identify unsuitable plants from cues within the colony: Waste from fungicide-treated privet leaves is enough to make foraging ants avoid this plant." ScienceDaily. www.sciencedaily.com/releases/2017/03/170308144722.htm (accessed May 26, 2017).

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