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Please use this identifier to cite or link to this item: http://dspace.utalca.cl/handle/1950/4161

Title: Behavioural differences between Aphidius ervi populations from two tritrophic systems are due to phenotypic plasticity
Authors: Daza-Bustamante, P.
Fuentes-Contreras, E.
Rodriguez, L.C.
Figueroa, C.C.
Niemeyer, H.M.
Keywords: Aphidius ervi, Acyrthosiphon pisum, Sitobion avenae, host searching behaviour, wind tunnel, aphid
Issue Date: 2002
Citation: Entomologia Experimentalis et Applicata Volume 104 (2-3): 321-328
Abstract: The Palaeoarctic parasitoid Aphidius ervi Haliday (Hymenoptera, Aphidiidae) parasitises legume aphids in its region of origin. In Chile, it parasitises both legume and cereal aphids. This special situation was studied at two levels: (i) the host searching behaviour of A. ervi from two different tritrophic systems (Acyrthosiphon pisum on alfalfa and Sitobion avenae on wheat) was investigated in dual choice tests in a wind tunnel between odours from both A. pisum-alfalfa host plant complex (HPC) and S. avenae-wheat HPC, and (ii) the genetic structure of A. ervi populations from both sources using molecular markers. Responses of A. ervi females to volatile olfactory cues emanating from A. pisum-alfalfa HPC and S. avenae-wheat HPC were significantly higher towards the HPC on which they were reared during the last generation before experimentation, regardless of the origin of the parasitoid. As previously described for this parasitoid species, oviposition experience was also of major relevance in the preferences of female parasitoids. On the other hand, variation in mitochondrial DNA segments and RAPD-PCR polymorphism using total DNA showed the absence of host-based population structure and a high genetic homogeneity between these A. ervi populations. These results reject the possible existence of different host-strains of this parasitoid in Chile.
Description: Fuentes-Contreras, E. and Reyes, M. Departmento de Producción, Agrícola, Facultad de Ciencias Agrarias, Universidad de Talca, Casilla 747, Talca, Chile.
URI: http://dspace.utalca.cl/handle/1950/4161
Appears in Collections:Artículos en publicaciones ISI - Universidad de Talca

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