Zoological Studies

Vol. 49 No. 2, 2010

Spiders Used as Prey by the Hunting Wasp Trypoxylon (Trypargilum) agamemnon Richards (Hymenoptera: Crabronidae)

Maria Luisa Tunes Buschini1,*, Talita Ribas Caldas1, Neide Augusta Borba1, and Antônio Domingos Brescovit2

1Departamento de Biologia da Universidade Estadual do Centro-Oeste, Rua Presidente Zacarias 875, 85010-990, Guarapuava (PR), Brasil
2Laboratório de Artrópodes, Instituto Butantan, Av. Vital Brasil 1500, 05503-900, São Paulo, Brasil

Maria Luisa Tunes Buschini, Talita Ribas Caldas, Neide Augusta Borba, and Antônio Domingos Brescovit (2010) The purpose of this study was to monitor the spider fauna in Trypoxylon agamemnon nests.  The study was carried out from Dec. 2001 to Dec. 2006 in the Parque Municipal das Araucárias, in the municipality of Guarapuava, state of Paraná, southern Brazil.  Nests of T. agamemnon were obtained using trap-nests made of wooden blocks.  To investigate the similarity between spider species in T. agamemnon’s diet, spiders species were grouped according to their abundances, using the Bray-Curtis coefficient as a metric method and the unweighted pair group method average (UPGMA) as the clustering method.  Spider species dominance was calculated, and Chi-square tests were used to test the null hypothesis that there was no significant difference among the proportions of collected juvenile, male, and female spiders.  In contrast to what was recorded for other species of spider-hunting wasps, T. agamemnon exclusively captures spiders (of the Anyphaenidae) that forage on the vegetation.  This probably maintains niche partitioning between Trypoxylon species that occur in the Parque Municipal das Araucárias, reducing competition for prey resources.

Key words: Crabronidae, Trypoxylon agamemnon, Spider, Prey use.

*Correspondence: E-mail:isatunes@yahoo.com.br