Abstract.
Intraspecific aggression is rare within introduced populations of the Argentine ant Linepithema humile, and colonies exhibit a structure known as unicoloniality, in which aggression among nests is atypical. We document a similar form of colony structure in an introduced population of Argentine ants in Victoria, Australia, in which aggression is extremely rare among nests ranging over hundreds of kilometres. However, using a highly sensitive behavioural bioassay we found that workers display subtle differences in their behaviour towards non-nestmates and nestmates. In particular, non-nestmates consistently engage in antennating behaviour with greater frequency than nestmates, perhaps providing a mechanism for homogenization of nest odour. Further, we found that non-nestmates at seaport sites (where populations may derive from multiple introductions) antennate each other with greater frequency than their counterparts from non-seaport sites. These data suggest that the Victorian population of L. humile may comprise multiple independent introductions.
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Received 4 July 2007; revised 15 January and 4 March 2008; accepted 4 March 2008.
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Björkman-Chiswell, B.T., van Wilgenburg, E., Thomas, M.L. et al. Absence of aggression but not nestmate recognition in an Australian population of the Argentine ant Linepithema humile . Insect. Soc. 55, 207–212 (2008). https://doi.org/10.1007/s00040-008-0990-9
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DOI: https://doi.org/10.1007/s00040-008-0990-9