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Insectes Sociaux

, Volume 65, Issue 2, pp 233–239 | Cite as

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

  • A. G. Farji-Brener
  • M. C. Dalton
  • U. Balza
  • A. Courtis
  • I. Lemus-Domínguez
  • R. Fernández-Hilario
  • D. Cáceres-Levi
Research Article

Abstract

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-cutting ants, a key ant group that is commonly found in rainy habitats. Specifically, we experimentally discriminate among direct and 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 loads were not wet. Watered leaf fragments increased their weight by 143% and were dropped independently with regards to area or symmetry. Watering the trail did not affect the proportion of ants that dropped their loads. Ants increased their speed by 30% after experimental increments in relative humidity and the noise of raindrops on leaves near the trail. Our experimental results confirm earlier anecdotic evidence of the negative effect of rainfall on the foraging of leaf-cutting ants. We demonstrate that rain can strongly limit ant foraging through different mechanisms, affecting both the ant itself, and the maneuverability of laden ants, by increasing the weight of their loads. We also depict behavioral responses that may mitigate this negative effect on foraging: walking faster at signals of rainfall to reduce the portion of leaf fragments lost. Our results illustrate how environmental factors can directly and indirectly constrain ant foraging and highlight the relevance of behavioral responses to mitigate these effects.

Keywords

Atta cephalotes Ant behavior Costa Rica Foraging Environmental restrictions 

Notes

Acknowledgements

This work was partially supported by the Fondo para la Investigación Científica y Tecnológica, Argentina (FONCYT; PICT 2015-1319) and CONICET, Argentina (PIP 2014–2016, 11220130100665-CO) to AFGB. The Organization for Tropical Studies (OTS) provided logistical support. One anonymous reviewer, Martin Burd and G. Pizzarello provided helpful comments on the manuscript.

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Copyright information

© International Union for the Study of Social Insects (IUSSI) 2018

Authors and Affiliations

  1. 1.Laboratorio Ecotono, INIBIOMA, Centro Regional Universitario BarilocheUniversidad del Comahue y CONICETBarilocheArgentina
  2. 2.Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”-CONICETBuenos AiresArgentina
  3. 3.Centro Austral de Investigaciones Científicas (CADIC-CONICET)UshuaiaArgentina
  4. 4.Facultad de Ciencias Exactas y Naturales y AgrimensuraUniversidad Nacional del Nordeste-CONICETCorrientesArgentina
  5. 5.Instituto de Ecología A.C., Red de Biología EvolutivaVeracruzMexico
  6. 6.Herbario Forestal MOL, Universidad Nacional Agraria La MolinaLimaPeru
  7. 7.Facultad de Ingeniería AgrariaUniversidad Católica Sedes SapientiaeLos OlivosPeru

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