Trap-nesting solitary wasps (Hymenoptera: Aculeata) in an insular landscape: Mortality rates for immature wasps, parasitism, and sex ratios


  • Ana Luiza Oliveira Nascimento Universidade de São Paulo, Departamento de Biologia, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto
  • Carlos Alberto Garófalo Universidade de São Paulo, Departamento de Biologia, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto



Atlantic forest, natural enemies, phenology, sex ratio, wasp abundance


The aim of this study was to examine the species composition and the abundance of solitary wasps that nest in preexisting cavities in the Ilha Anchieta State Park, Brazil. Sampling was made during two years utilizing trap-nests. Of the 254 nests obtained, 142 nests were built by 14 species belonging to four genera and four families. In the remaining 112 nests all immatures were dead by unknown causes or had been parasitized by natural enemies.  The occupation of trap-nests occurred almost throughout the study period and the wasps nested more frequently during the super-humid season. Trypoxylon lactitarse, Pachodynerus nasidens, Trypoxylon sp.2 aff. nitidum and Podium denticulatum were the most abundant species. The sex ratios of T. lactitarse and Trypoxylon sp.2 aff. nitidum were significantly male-biased, whereas those of Trypoxylon sp.5 aff. nitidum and P. nasidens were significantly female-biased. Sex ratios of P. denticulatum and P. brevithorax were not significantly different from 1:1. Natural enemies emerging from the nests were identified as belonging to the families Chrysididae, Ichneumonidae  and Chalcididae (Hymenoptera), the genus Melittobia (Hymenoptera, Eulophidae), and the species Amobia floridensis (Townsend, 1892) (Diptera: Sarcophagidae). The number of cells with dead immatures  from unknown factors was significantly higher than the number of cells parasitized by insects.


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How to Cite

Nascimento, A. L. O., & Garófalo, C. A. (2014). Trap-nesting solitary wasps (Hymenoptera: Aculeata) in an insular landscape: Mortality rates for immature wasps, parasitism, and sex ratios. Sociobiology, 61(2), 207–217.



Research Article - Wasps

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