Organización para Estudios Tropicales, (OET), Costa Rica
Bibliografía Nacional en Biología Tropical, (BINABITROP)

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Signatura:Biblioteca OET: NBINA-14472. Biblioteca OET: S7. Biblioteca Museo Nacional: Ind. Publ. Ent. No. 1485.
Autor: Young, Allen M.
Dirección: Milwaukee Public Museum, Invertebrate Zoology Section, Milwaukee, WI 53233, US E-mail: young@mpm1.mpm.edu.
Título: Attacks by the army ant Eciton burchellii on nests of the social paper wasp Polistes erythrocephalus in northeastern Costa Rica. Ataques por parte de las hormigas guerreras Eciton burchellii sobre los nidos de la avispa papelera Polistes erythrocephalus en el noreste de Costa Rica.
P.imprenta: v. 52, no. 4, p. 759-768. Año 1979.
Serie: Journal of the Kansas Entomological Society.
Descriptores: ANIMALS; INVERTEBRATES; ARTHROPODS; INSECTS.
HYMENOPTERA; FORMICIDAE; DORYLINAE; ECITON BURCHELLII; VESPIDAE; POLISTINAE; POLISTES ERYTHROCEPHALUS; PREDATORS; NEST; INSECT BEHAVIOUR.
COSTA RICA; CENTRAL AMERICA.
LA SELVA BIOLOGICAL STATION; AREA DE CONSERVACION CORDILLERA VOLCANICA CENTRAL.
Resumen: Attacks by the army ant Eciton burchellii (Hymenoptera: Formicidae: Dorylinae) on nests of the social paper wasp Polistes erythrocephalus (Vespidae: Polistinae) were witnessed at one locality (La Selva Biological Station) in northeastern Costa Rica near the end of a wet season. Prior to, and following the attacks, data were recorded on the sizes of nests, numbers of adult wasps, and presence of brood in the nests. Before the first attack, 41 nests, of which 34 were new and contained large larvae and pupae, were present on a building along with a total of 244 adults. Nests were linearly arranged on eaves and wasps aggregated on them each night. Adult wasps were unsuccessful in defending nests against attacks, and there was 100% mortality of larvae and pupae on 17 of the active nests. Attacks resulted in the evaluation of P. erythrocephalus. There was a significant reduction in the number of adult wasps remaining on nests, presumably a result of wasps scattering to nearby areas and founding new nests away from the building. Following the first attack, three new nests were built, and ravaged nests were left unused. One new nest was built on the pedicel of a ravaged nest that was torn down by the wasps. The three new nests steadily increased in size until a second attack, about three and one-half weeks later, destroyed these nests. At the end of the wet season and during the dry season, webs of the large orb-weaver Nephila clavipes became abundant and blocked wasps from reaching eaves that once served as nest sites. It is suggested that frequent attacks of P. erythrocephalus nests by E. burchelli, and increased inaccessability of nest sites, caused the marked dwindling of the wasp population on the building
Compiled by: Organization for Tropical Studies


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