Ants medicate to fight disease. (16th September 2015)

• Record Type: Journal Article
• Authors: Bos, Nick; Sundström, Liselotte; Fuchs, Siiri; Freitak, Dalial
• Is Part Of: Evolution. Volume 69:Number 11(2015:Nov.)
• Page Start: 2979
• Page End: 2984
• Publication Date: 2015-09-16
• Subjects: Diet choice -- immunity -- reactive oxygen species -- self‐medication -- social insects; Evolution -- Periodicals; Heredity -- Periodicals; Évolution (Biologie) -- Périodiques; Hérédité -- Périodiques; 338.47004094
• DOI: 10.1111/evo.12752
• Languages: English
• ISSNs: 0014-3820

Abstract

Abstract : Parasites are ubiquitous, and the ability to defend against these is of paramount importance. One way to fight diseases is self‐medication, which occurs when an organism consumes biologically active compounds to clear, inhibit, or alleviate disease symptoms. Here, we show for the first time that ants selectively consume harmful substances (reactive oxygen species, ROS) upon exposure to a fungal pathogen, yet avoid these in the absence of infection. This increased intake of ROS, while harmful to healthy ants, leads to higher survival of exposed ants. The fact that ingestion of this substance carries a fitness cost in the absence of pathogens rules out compensatory diet choice as the mechanism, and provides evidence that social insects medicate themselves against fungal infection, using a substance that carries a fitness cost to uninfected individuals.