Unsuccessful Attacks Dominate a Drone- Preying Wasp's Hunting

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Unsuccessful attacks dominate a drone- preying wasp’s hunting performance near stingless bee nests D. Koedam1, E.J. Slaa2, J.C. Biesmeijer2 and P. Nogueira-Neto3 1Departamento de Botânica, Instituto de Biociências, Universidade Estadual Paulista, Botucatu, SP, Brasil 2School of Biology, University of Leeds, Leeds, United Kingdom 3Departamento de Ecologia Geral, Laboratório de Abelhas, Instituto de Biociências, Universidade de São Paulo, São Paulo, SP, Brasil Corresponding author: D. Koedam E-mail: [email protected] Genet. Mol. Res. 8 (2): 690-702 (2009) Received December 12, 2008 Accepted January 26, 2009 Published June 16, 2009 ABSTRACT. Bee males (drones) of stingless bees tend to congregate near entrances of conspecific nests, where they wait for virgin queens that initiate their nuptial flight. We observed that the Neotropical solitary wasp Trachypus boharti (Hymenoptera, Cabronidae) specifically preys on males of the stingless bee Scaptotrigona postica (Hymenoptera, Apidae); these wasps captured up to 50 males per day near the entrance of a single hive. Over 90% of the wasp attacks were unsuccessful; such erroneous attacks often involved conspecific wasps and worker bees. After the capture of non- male prey, wasps almost immediately released these individuals unharmed and continued hunting. A simple behavioral experiment showed that at short distances wasps were not specifically attracted toS. postica males nor were they repelled by workers of the same species. Likely, short-range prey detection near the bees’ nest is achieved mainly by vision whereas close- range prey recognition is based principally on chemical and/or mechanical cues. We argue that the dependence on the wasp’s visual perception during attack and the crowded and dynamic hunting conditions caused wasps to make many preying attempts that failed. Two wasp-density-related factors, Genetics and Molecular Research 8 (2): 690-702 (2009) ©FUNPEC-RP www.funpecrp.com.br wasp-prey distance and wasp-wasp encounters, may account for the fact that the highest male capture and unsuccessful wasp bee encounter rates occurred at intermediate wasp numbers. Key words: Predation; Trachypus; Scaptotrigona; Male; Detection error; Wasp density Genetics and Molecular Research 8 (2): 690-702 (2009) ©FUNPEC-RP www.funpecrp.com.br.

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