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Insectes Sociaux

, Volume 62, Issue 3, pp 315–323 | Cite as

Social biology of Augochlora (Augochlora) phoemonoe (Hymenoptera, Halictidae) reared in laboratory nests

  • M. DalmazzoEmail author
  • A. Roig-Alsina
Research Article

Abstract

Species of the subgenus Augochlora have been considered solitary, and their behavior was postulated as a reversal from the social condition known for its closest relatives. In this study, conclusive evidence of eusocial behavior in the wood-dwelling subgenus Augochlora is presented. Direct observation of behavior within artificial nests in the laboratory allowed studying the suite of behaviors that characterize social structure in the species Augochlora (Augochlora) phoemonoe. The following behaviors were recorded and analyzed: locomotion, feeding, construction activities within the nest, pollen collecting, guarding, oviposition, sudden retreats, antennation-tarsation, passing, and following. The last three behaviors represented interactions between nestmates. Social behavior in this temperate South American species is characterized by: a solitary nest initiation phase, followed by an eusocial phase with at least two broods; the small size of the colonies, with 1-3 first-brood females during the summer foraging period; the long-lived foundresses, alive until the end of the season; lack of morphological differentiation between dominant and subordinate individuals, evidenced by size only, but strong physiological differentiation, with a high reproductive skew; short egg-to-adult developmental time (approximately 30 days); and delayed male production to the second or subsequent broods. Indexes of division of labor ranged between 0.32 and 0.76 for the studied nests, indicating behavioral specialization between colony members. During the eusocial phase, daughter bees had the highest frequencies of construction, pollen collection and guarding. Colony integration was mediated by high rates of social interactions, initiated by the foundress.

Keywords

Augochlorini Social behavior Eusocial bees Behavioral specialization Castes 

Notes

Acknowledgments

We thank Rocío Gonzalez-Vaquero for her invaluable help in bee rearing, Gerónimo Galvani for helping us to make tissue sections with the cryostat, and Lina Horovitz for providing comments on language style. We thank Miriam Richards, Associate Editor, and two anonymous reviewers for their helpful comments that improved the manuscript. This study was supported by grants ANPCyT, Argentina, 2007-1238, and CONICET, Argentina, PIP 2011-0288.

Supplementary material

40_2015_412_MOESM1_ESM.pdf (293 kb)
Supplementary material 1 (PDF 292 kb)

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Copyright information

© International Union for the Study of Social Insects (IUSSI) 2015

Authors and Affiliations

  1. 1.CONICET, División EntomologíaMuseo Argentino de Ciencias Naturales “Bernardino Rivadavia”Buenos AiresArgentina
  2. 2.CONICET, Departamento de Ciencias Naturales, Entomología, Facultad de Humanidades y CienciasUniversidad Nacional del LitoralSanta FeArgentina

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