Data from: Collective defence portfolios of ant hosts shift with social parasite pressure

Evelien Jongepier, Isabelle Kleeberg, Sylwester Job & Susanne Foitzik
Host defences become increasingly costly as parasites breach successive lines of defence. Because selection favours hosts that successfully resist parasitism at the lowest possible cost, escalating coevolutionary arms races are likely to drive host defence portfolios towards ever more expensive strategies. We investigated the interplay between host defence portfolios and social parasite pressure by comparing 17 populations of two Temnothorax ant species. When successful, collective aggression not only prevents parasitation but also spares host colonies...
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