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Cassidy, Steven T.; Chapa, Jade; Tran, Tram-Anh; Dolezal, Nicholas; Gerena, Chelsey; Johnson, Gloria; Leyva, Arletys; Stein, Samantha; Wright, Colin M.; Keiser, Carl N.
Animal behaviour, September 2021, 2021-09-00, Letnik: 179Journal Article
Eusocial insect societies possess complex multilevel disease defences, including individual level protection conferred by physical (e.g. cuticle) and immunological obstacles and colony level protection mediated by collective behaviours (social immunity). It remains unclear whether and how these two levels of disease protection are related to one another in jointly driving colonies’ susceptibility to disease. Here, we examine whether a relationship exists between individual worker survival after exposure to a fungal pathogen (a proxy for immunity) and corpse removal (a colony level social immunity metric) in the acorn ant Temnothorax curvispinosus. Since behavioural avoidance is the first line of defence against infection, we also tested whether individual ants exhibited parasite avoidance behaviour during exploration and whether colonies exhibit avoidance behaviour during foraging. We found that individual level and colony level immunity were negatively correlated: colonies that removed corpses more rapidly contained workers with weaker individual defences. We did not detect parasite avoidance behaviour by individual workers or whole colonies, nor were these two factors related. These data suggest that individual immunity and social immunity may trade off, regulating overall parasite protection. Alternatively, optimized social immunity at the colony level may compensate for disease vulnerability to infection at the individual level, and thus provide a protective benefit in overall colony defence in the absence of pathogen avoidance. •We measured individual and collective disease protection in acorn ants.•Colonies with stronger individual protection had weaker collective protection.•Avoidance was not detected at the individual or collective level.•Multilevel disease protection trade-offs may vary across colonies and environments.
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