Abstract
Central-place foragers need to explore their immediate habitat in order to reach food. We let colonies of the individually foraging desert ant Cataglyphis niger search for a food reward in a maze. We did so for three tests per day over two successive days and an additional test after a time interval of 4–20 days (seven tests in total). We examined whether the colonies reached the food reward faster, consumed more food and changed the number of workers searching over time, within and between days. Colonies’ food-discovery time shortened within and between days, indicating that some workers learnt and became more efficient in moving through the maze. Such workers, however, also forgot and deteriorated in their food-discovery time, leveling off back to initial performance after about two weeks. We used mazes of increasing complexity levels, differing in the potential number of wrong turns. The number of workers searching increased with colony size. Food-discovery time also increased with colony size in complex mazes but not in simple ones, perhaps due to the more frequent interactions among workers in large colonies having to move through narrow routes. Finally, the motivation to solve the maze was probably not only the food reward, because food consumption did not change over time.
Highlights
Learning can be defined as the acquisition of experience, allowing an animal to change its response to specific stimuli or situations [1,2]
We examined whether there is an effect of maze complexity (0–3) and colony size on the three foraging response variables
We show that the foraging workers do learn and forget: while shorter time intervals between tests led to faster arrival at the food, longer intervals did not
Summary
Learning can be defined as the acquisition of experience, allowing an animal to change its response to specific stimuli or situations [1,2]. Learning abilities in the search for food resources should evolve, especially when resources are clumped in space or only temporarily available [9] Central place foragers, such as ants and rodents living in nests, need to navigate in space in order to locate food and to bring it back to their nest, in a way that minimizes travel and time costs [10,11,12]. This requirement has selected for enhanced spatial orientation in such animals [13,14]
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