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Original Article

Parasitic assemblages on leafminers: a comparison of structure and function among host orders

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Pages 11-22 | Received 20 Oct 2009, Accepted 26 Oct 2010, Published online: 11 Mar 2011
 

Abstract

In this study we ask whether parasitic complexes of leafminers display differences associated to host order, by comparing species number, taxonomic composition, parasitism rates and host ranges in parasitoid assemblages associated with lepidopteran and dipteran leafminers, in Chaco Serrano woodlands, central Argentina. Parasitoid assemblage size did not significantly differ between host orders, but dipteran hosts suffered higher parasitism rates. Lepidopteran hosts recruited a higher proportion of species and individuals of Braconidae, whereas dipteran leafminers were attacked by a higher proportion of Pteromalidae. We found clear effects of host taxonomic affiliation on the associated parasitoid fauna.

En este estudio preguntamos si las comunidades de parasitoides de minadores de hojas difieren según el orden del hospedador, analizando número de especies, composición taxonómica, tasas de parasitismo y rango de hospedadores en complejos parasíticos asociados a minadores de hojas de los órdenes Lepidoptera y Diptera en Chaco Serrano, Argentina Central. El tamaño de los complejos no difirió significativamente entre órdenes de hospedadores, pero los dípteros minadores sufrieron porcentajes de parasitismo más elevados. Lepidoptera mostró mayor proporción de especies e individuos de Braconidae, mientras que los dípteros minadores fueron atacados por una mayor proporción de Pteromalidae. Encontramos claros efectos de la afiliación taxonómica del hospedador sobre la fauna de parasitoides asociados.

Acknowledgements

We thank M.T. Defagó and S.I. Molina for technical assistance. This research was supported by CONICET, FONCyT and SECyT.

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