Abstract

Detailed observations are presented on the behavior of a group of male Halictus poeyi Lepeletier bees (Hymenoptera: Halictidae) in their selected roosting sites on Bidens pilosa L. and Emilia sonchifolia (L.) DC plants. Over approximately 50 days, climatic conditions, habitat structure, and associated species were recorded. These observations suggest that clusters exhibit area fidelity within a radius of approximately 1.5m, rather than fidelity to specific plant individuals or species. Roost site selection appears to be influenced by microhabitat structure, sunlight exposure, weather conditions, and plant structural characteristics. In our observations, no emerging or nesting females were found near the nocturnal roosting sites.

Resumen

Se presentan observaciones detalladas sobre la conducta de un grupo de machos de la abeja Halictus poeyi Lepeletier (Hymenoptera: Halictidae) en los dormitorios escogidos, para pasar la noche, en las plantas Bidens pilosa L. y Emilia sonchifolia (L.) DC. Se registraron, durante unos 50 días, las condiciones climáticas, estructura del hábitat, así como las especies asociadas. Estas observaciones sugieren que los enjambres mostraron fidelidad al área dentro de un radio de aproximadamente 1.5 m, en lugar de fidelidad a individuos o especies vegetales específicas. La selección del sitio de descanso nocturno parece estar influenciada por la estructura del microhábitat, la exposición al sol, las condiciones climáticas y las características estructurales de las plantas. En nuestras observaciones no se encontraron hembras emergentes o nidificando cerca de los sitios de descanso nocturno.

References

• Alcock J. 1988. Sleeping aggregations of the bee Idiomelissodes duplocincta (Cockerell) (Hymenoptera: Anthophorini) and their possible function. Journal of the Kansas Entomological Society 71: 74–84.  
• Alves-dos-Santos I, Gaglianone M, Naxara SRC, Engel MS. 2009. Male sleeping aggregations of solitary oil-collecting bees in Brazil (Centridini, Tapinotaspidini, and Tetrapediini; Hymenoptera: Apidae). Genetics and Molecular Research 8: 515–524.  
• Chemsak JA, Thorp RW. 1962. Note on the sleeping habits of males of Melissodes robustior Cockerell (Hymenoptera: Apoidea). The Pan-Pacific Entomologist 38: 53–55.  
• Danforth BN, Minckley RL, Neff JL. 2019. The solitary bees: Biology, Evolution, Conservation. Princeton University Press; Princeton and Oxford. 472 p 
• DeSalle R, Goldstein P. 2019. Review and interpretation of trends in DNA Barcoding. Frontiers in Ecology and Evolution 7: 302. https://doi.org/https://doi.org/10.3389/fevo.2019.00302 
• Evans HE, Linsley EG. 1960. Notes on the sleeping aggregation of solitary bees and wasps. Bulletin of the South California Academy of Sciences 59: 30–37.  
• Genaro JA. 2007. Las abejas (Hymenoptera: Apoidea: Anthophila) de La Hispaniola, Antillas. Boletín Sociedad Entomológica Aragonesa 40: 247–254.  
• Grassé PP. 1942. Les rassemblements de sommeil des Hymenopteres et leur interpretation. Bulletin de la Société Entomologique de France 1942: 142–148.  
• Houston T. 2018. A guide to native bees of Australia. CSIRO publishing; Canberra, Australia. 272 p 
• Hurd PD Jr., Linsley EG. 1976. The bee family Oxaeidae with a revision of the North American species (Hymenoptera: Apoidea). Smithsonian Contributions to Zoology 220: 1–75.  
• Kaiser W. 1995. Rest at night in some solitary bees—a comparison with the sleep-like state of honey bees. Apidologie 26: 213–230.  
• Levenson HK, Tembrock LR, Zink, FA, Mollet, KA, Tarpy, DR. 2025. Redefining the Geographic Distribution of Two Cryptic Halictus (Hymenoptera: Halictidae) Species in the Eastern United States. Ecology and Evolution 15: e71570. https://doi.org/https://doi.org/10.1002/ece3.71570 
• Mahlmann T, Hipólito J, Oliveira FF de. 2014. Male sleeping aggregation of multiple Eucerini bee genera (Hymenoptera: Apidae) in Chapada Diamantina, Bahia, Brazil. Biodiversity Data Journal 2: e1556. https://doi.org/https://doi.org/10.3897/BDJ.2.e1556 
• Moure JS, Melo GAR. 2022. Halictini Thomson, 1869. In: Moure JS, Urban D, Melo GAR (orgs.). Catalogue of Bees (Hymenoptera, Apoidea) in the Neotropical Region - Online Edition. Available at https://moure.cria.org.br/catalogue  (Last accessed 12 February 2025)
• O’Toole C, Raw A. 1991. Bees of the world. Facts on File; New York, NY. 192 p 
• Packer L, Ali E, Dumesh S, Walker K. 2016. The identification of pollinators: Where are we and where should we go? Chapter 5. p. 57–73. In: Gemmill-Herren B (ed.). Pollination services to agriculture. Sustaining and enhancing a key ecosystem service. 1st edition. Taylor and Francis Group; London, UK and New York, NY. 292 p 
• Pinheiro M, Alves-dos-Santos I, Sazima M. 2017. Flowers as sleeping places for male bees: somehow the males know which flowers their females prefer. Arthropod-Plant Interactions 11: 329–337.  
• Rayment T. 1935. A cluster of bees. Endeavour Press; Sydney, Australia. 752 p 
• Roubik DW. 1992. Ecology and natural history of tropical bees. Cambridge Tropical Biology Series. Cambridge University Press; Cambridge, UK. 514 p 
• Schremmer F. 1955. Beobachtungen uber die Nachtruhe bei Hymenopteren, insbesondere die Mannchenschlafgesellschaften von Halictus. Österreich Zoologie Zeitschrift 6: 70–89.  
• Silva MD e, Andrade-Silva ACR, Silva M. 2011. Long-term male aggregations of Euglossa melanotricha Moure (Hymenoptera: Apidae) on fern fronds Serpocaulon triseriale (Pteridophyta: Polypodiaceae). Neotropical Entomology 40(5): 548–552.  
• Silva WP, Andrade RR. 2022. Male sleeping aggregation of Melissodes (Ecplectica) nigroaenea (Smith, 1854) (Hymenoptera, Apidae, Eucerini) in Brazilian Cerrado. Sociobiology 69(2): 1–5.  
• Stephen WP, Bohart GE, Torchio PF. 1969. The biology and external morphology of bees. With a synopsis of the genera of Northwestern America. Agricultural Experimental Station, Oregon State University; Corvallis, OR. 140 p 
• Wcislo WT. 2003. A male sleeping roost of a sweat bee, Augochlorella neglectula (Ckll.) (Hymenoptera: Halictidae), in Panamá. Journal of the Kansas Entomological Society 76(1): 55–59.