Eur. J. Entomol. 112 (4): 722-727, 2015 | 10.14411/eje.2015.092

Sociogenetic structure in nests of the mud dauber wasp Trypoxylon (Trypargilum) albitarse (Hymenoptera: Crabronidae)

Antonio C. BRAGATO BERGAMASCHI1, Juliano DA COSTA ALMEIDA1, Lucio A. DE OLIVEIRA CAMPOS2, Marco A. DEL LAMA1
1 Departamento de Genética e Evolução, Universidade Federal de São Carlos, 13565-905 São Carlos, SP, Brazil; e-mails: acbbergamaschi@gmail.com; juliano03@gmail.com; dmdl@ufscar.br
2 Departamento de Biologia Geral, Universidade Federal de Viçosa, 36570-000 Viçosa, MG, Brazil; e-mail: lcampos@ufv.br

Trypargilum is a subgenus of solitary spider-hunting wasps whose males guard the nest, an unusual behaviour for male wasps. A male pairs with a female and copulates repeatedly with her during the nesting process, although females regularly copulate with satellite males, which employ an alternative reproductive strategy. The purpose of this paper was to determine the sociogenetic structure in twenty-nine nests of Trypoxylon albitarse sampled at six sites in Brazil. A total of 367 wasps were genotyped for eight species-specific polymorphic microsatellite loci. Genotypic segregation analyses were conducted to test whether the nests sampled were monogamic family groups. The results indicated that all the offspring in 12 of the 29 nests could be attributed to a single couple (genetic monogamy). Approximately 9% of the offspring probably resulted from extra-pair copulations and 3% of the total offspring were attributed to a second mother (usurpation by conspecific females, a form of intraspecific parasitism). The sequential replacement of parents throughout the nesting process indicates that the 29 nests analyzed included 35 family groups. Thus, our findings indicate that Trypoxylon albitarse has a predominantly monogamous genetic mating system, despite the social polygamy reported in previous studies.

Keywords: Hymenoptera, Crabronidae, Trypoxylon, mating system, paternity, guarding male, SSR markers

Received: October 9, 2014; Accepted: May 12, 2015; Prepublished online: September 22, 2015; Published: November 21, 2015

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