Abstract
Chemical cues are among the most important information-sharing mechanisms in insect societies, in which cuticular hydrocarbons play a central role, e.g., from nestmate recognition to queen signaling. The nestmate recognition mechanism usually prevents intruders from taking advantage of the resources stored in the nest. However, nestmate recognition is not unconditionally effective, and foreign individuals can sometimes infiltrate unrelated nests and take advantage of the colony resources. In this study, we investigated the role of overall colony odor profiles on the ability of conspecific workers to drift into unrelated colonies. We hypothesized that drifters would have higher chances of success by infiltrating colonies with the odor profiles most similar to their own nest, avoiding being detected as non-nestmates. By performing a drifting bioassay, we found that workers of the ant Formica fusca infiltrated unrelated conspecific colonies at a rate of 2.4%, significantly infiltrating colonies displaying CHC profiles most similar to their natal nests. Notably, methyl branched hydrocarbons seem to play a role as recognition cues in this species. In addition, we show that environmental rather than genetic factors are responsible for most contributions on the CHC phenotype, presenting ca. of 50% and 27.5% of explained variation respectively, and playing a major role in how worker ants detect and prevent the infiltration of non-nestmates in the colony. Hence, relying on cuticular hydrocarbons similarities could be a profitably evolutionary strategy by which workers can identify conspecific colonies, evade detection by guards, and avoid competition with genetic relatives.
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Data Availability
The raw datasets and R scripts used in this manuscript are available at Mendeley Data Repository (Oliveira et al. 2021).
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Funding
R.C.O. was supported by a grant from CNPq-Brazil (238127/2012–5) and Research Foundation Flanders (Research Grant 1502119 N and Postdoctoral Fellowship 12R9619N). J.V.Z. was supported by a FWO Postdoctoral Fellowship (12Q7615N).
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R.C.O and J.V.Z. had the original idea. R.C.O. performed the experiments. R.C.O, T.W. and J.V.Z. analyzed the data. R.C.O. wrote the first draft of the manuscript. All authors edited and revised the manuscript.
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Caliari Oliveira, R., van Zweden, J. & Wenseleers, T. Similarities in Recognition Cues Lead to the Infiltration of Non-Nestmates in an Ant Species. J Chem Ecol 48, 16–26 (2022). https://doi.org/10.1007/s10886-021-01325-3
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DOI: https://doi.org/10.1007/s10886-021-01325-3