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Social dominance modifies behavioral rhythm in a queenless ant

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Abstract

Social insects provide an intriguing model system in chronobiology. Typically, an egg-laying queen exhibits arrhythmicity in activity while foraging worker has clear rhythmicity. In the queenless ant, Diacamma sp., from Japan, colony members lack morphological caste, and reproductive differentiation occurs as a consequence of dominance hierarchy formation. Their specialized dominance interaction “gemmae mutilation”, provide us a fascinating model system to investigate the effect of social dominance on rhythmic ontogeny. Measurement of individual rhythms revealed that they have clear circadian rhythm at eclosion but it is diminished by social mutilation of gemmae. Moreover, unlike highly eusocial species, mated egg-layer (i.e., gamergate) possessed a circadian rhythm even after mating in Diacamma. Measurement of colony-level rhythms revealed that gemmae mutilations are performed in the limited time of the day, but foraging occurs around-the-clock. The above finding is a novel form of temporal organization in social insects, providing a new insight in morphologically casteless species. We discuss the causes and consequences of rhythmic variability in social organization.

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Acknowledgments

We thank for T. Shimoji, T. Kikuchi, M. Hojo, S. Dobata, K. Okada, M. Abe for supporting technical procedure and ant collection. This work was supported by Japan Society for the Promotion of Science to T.F., Y.O. (KAKENHI 24870006, 26870121), and T. M. (KAKENHI 23570027).

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Correspondence to Yasukazu Okada.

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Communicated by J. Heinze

T. Fuchikawa and Y. Okada contributed equally to this work.

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Figure S1

Temporal dynamics of forager numbers. Each column is number of foragers (workers outside of the nest) in every 30-minutes. Open and closed arrowheads indicate light-on and light-off respectively in the environmental chamber before measurement. Measurements were under constant dark condition. Colony names are above the histograms. (DOC 92 kb)

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Fuchikawa, T., Okada, Y., Miyatake, T. et al. Social dominance modifies behavioral rhythm in a queenless ant. Behav Ecol Sociobiol 68, 1843–1850 (2014). https://doi.org/10.1007/s00265-014-1793-9

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  • DOI: https://doi.org/10.1007/s00265-014-1793-9

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