Working in the rain? Why leaf-cutting ants stop foraging when it’s raining

FARJI-BRENER, A. G.; DALTON, M. C.; BALZA, U.; COURTIS, A.; LEMUS-DOMÍNGUEZ, I.; FERNÁNDEZ-HILARIO, R.; CÁCERES-LEVI, D.

INSECTES SOCIAUX

BIRKHAUSER VERLAG AG

Año: 2018

0020-1812

Understanding how environmental factors modulate foraging is key to recognizing the adaptive value of animal behavior,especially in ectothermic organisms such as ants. We experimentally analyzed the effect of rain on the foraging of leaf-cuttingants, a key ant group that is commonly found in rainy habitats. Specifically, we experimentally discriminate among directand indirect effects of rain on laden ants and explore whether ants respond to rain predictors by incrementing their speed.Watered loads were frequently dropped although ants were not wet, and watered ants also dropped their loads although loadswere not wet. Watered leaf fragments increased their weight by 143% and were dropped independently with regards to areaor symmetry. Watering the trail did not affect the proportion of ants that dropped their loads. Ants increased their speed by30% after experimental increments in relative humidity and the noise of raindrops on leaves near the trail. Our experimentalresults confirm earlier anecdotic evidence of the negative effect of rainfall on the foraging of leaf-cutting ants. We demonstratethat rain can strongly limit ant foraging through different mechanisms, affecting both the ant itself, and the maneuverabilityof laden ants, by increasing the weight of their loads. We also depict behavioral responses that may mitigate this negativeeffect on foraging: walking faster at signals of rainfall to reduce the portion of leaf fragments lost. Our results illustrate howenvironmental factors can directly and indirectly constrain ant foraging and highlight the relevance of behavioral responsesto mitigate these effects.