Intracolony relatedness and polydomy in the Australian meat ant, Iridomyrmex purpureus

Abstract

In polydomous ants, individuals belonging to a single colony occupy a variable number of neighbouring nests. Polydomy is frequently associated with polygyny and species are often both facultatively polydomous and facultatively polygynous. In this study we test the generality of this association by investigating the genetic and spatial structure of polydomous colonies of Iridomyrmex purpureus in New South Wales, Australia. Genetic analysis of 15 colonies revealed high relatedness within all but one of the colonies, indicating that the workers are mostly produced by one, singly inseminated queen. Polydomy in this population therefore is not associated with polygyny. Intriguingly, our behaviour..