Abstract
The geometric framework model predicts that animal foraging decisions are influenced by their dietary history, with animals targeting a combination of essential nutrients through compensatory foraging. We provide experimental confirmation of nutrient-specific compensatory foraging in a natural, free-living population of social insects by supplementing their diet with sources of protein- or carbohydrate-rich food. Colonies of the ant Iridomyrmex suchieri were provided with feeders containing food rich in either carbohydrate or protein for 6 days, and were then provided with a feeder containing the same or different diet. The patterns of recruitment were consistent with the geometric framework: while feeders with a carbohydrate diet typically attracted more workers than did feeders with protein diet, the difference in recruitment between the two nutrients was smaller if the colonies had had prior access to carbohydrate than protein. Further, fewer ants visited feeders if the colony had had prior access to protein than to carbohydrates, suggesting that the larvae play a role in worker foraging behaviour.
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Acknowledgements
We thank Therésa Jones, Naomi Pierce, Steve Simpson and several referees for their helpful insights, and John Wainer for taxonomic advice.
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Christensen, K.L., Gallacher, A.P., Martin, L. et al. Nutrient compensatory foraging in a free-living social insect. Naturwissenschaften 97, 941–944 (2010). https://doi.org/10.1007/s00114-010-0705-8
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DOI: https://doi.org/10.1007/s00114-010-0705-8