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Is big the best? Queen size, usurpation and nest closure in a primitively eusocial sweat bee (Lasioglossum malachurum)

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Abstract

For primitively eusocial insects in which a single foundress establishes a nest at the start of the colony cycle, the solitary provisioning phase before first worker emergence represents a risky period when other, nestless foundresses may attempt to usurp the nest. In the primitively eusocial sweat bee Lasioglossum malachurum (Hymenoptera, Halictidae), spring foundresses compete for nests which are dug into hard soil. Nest-searching foundresses (‘floaters’) frequently inspected nests during this solitary phase and thereby exerted a usurpation pressure on resident queens. Usurpation has been hypothesised to increase across the solitary provisioning phase and favour closure of nests at an aggregation, marking the termination of the solitary provisioning phase by foundresses, before worker emergence. However, our experimental and observational data suggest that usurpation pressure may remain constant or even decrease across the solitary provisioning phase and therefore cannot explain nest closure before first worker emergence. Levels of aggression during encounters between residents and floaters were surprisingly low (9% of encounters across 2 years), and the outcome of confrontations was in favour of residents (resident maintains residency in 94% of encounters across 2 years). Residents were significantly larger than floaters. However, the relationship between queen size and offspring production, though positive, was not statistically significant. Size therefore seems to confer a considerable advantage to a queen during the solitary provisioning phase in terms of nest residency, but its importance in terms of worker production appears marginal. Factors other than intraspecific usurpation need to be invoked to explain the break in provisioning activity of a foundress before first worker emergence.

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Acknowledgements

We thank two anonymous referees for very useful and constructive criticism of the manuscript, and Anne Zillikens, Antonella Soro and Tomàs Murray for their helpful comments on an earlier version. This work was partly supported by the DFG (Pa 632), the DAAD and the Erwin–Riesch–Stiftung. MUZ thanks H.R. Köhler for support and W. Engels for advice. Bees were collected under permit 56-6/8852.15 (Regierungspräsidium Tübingen). Experiments and observations conform to the laws of Germany.

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  1. Zoological Institute, University of Tübingen, Auf der Morgenstelle 28, 72076, Tübingen, Germany

    Marion U. Zobel

  2. School of Biological Sciences, Queen’s University Belfast, 97 Lisburn Road, Belfast, BT9 7BL, UK

    Robert J. Paxton

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  1. Marion U. Zobel
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  2. Robert J. Paxton
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Correspondence to Marion U. Zobel.

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Communicated by R.F.A. Moritz

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Zobel, M.U., Paxton, R.J. Is big the best? Queen size, usurpation and nest closure in a primitively eusocial sweat bee (Lasioglossum malachurum). Behav Ecol Sociobiol 61, 435–447 (2007). https://doi.org/10.1007/s00265-006-0271-4

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