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Effects of intraspecific hybridization on the fitness of the egg parasitoid Trichogramma galloi

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Abstract

Successive rearing in laboratory conditions can result in the loss of genetic diversity, inbreeding depression and adaptation to the captive environment, affecting the quality of the insects reared and compromising their field performance. Introduction of genetic variation by admixing different populations may increase the fitness of populations, minimizing the negative effects of rearing many generations in artificial conditions. We experimentally investigated the role of intraspecific hybridization in enhancing the fitness of the egg parasitoid Trichogramma galloi Zucchi, 1988 (Hymenoptera: Trichogrammatidae), by reciprocally crossing three populations. Our results showed that the mating type did not affect the number of crosses that produced viable daughters. Homotypic crosses produced 94% viable daughters, while heterotypic crosses produced 92%. There were neither mating incompatibilities nor reproductive barriers between these populations. However, we observed a low fitness value for females from one of the populations studied. The fitness of hybrids was either unchanged or improved (in one case) when compared to the parental populations. We discuss the implications of our results and suggest future research directions.

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Acknowledgements

We thank Dr. Janet W. Reid (JWR Associates) for English and technical corrections, the Conselho Nacional de Desenvolvimento Científico e Tecnológico – CNPq (Processo: 140539/2012-3) for granting a scholarship to the first author, and the National Institute of Semiochemicals in Agriculture (Process nos. CNPq 573761/2008-6 and FAPESP 2008/57701-2) for financial support.

Funding

This study was funded by the National Institute of Semiochemicals in Agriculture (Process nos. CNPq 573761/2008-6 and FAPESP 2008/57701-2).

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Author notes

  1. Vitor Antonio Corrêa Pavinato

    Present address: Institute National de la Recherche Agronomique – INRA, Centre de Biologie pour la Gestion des Populations – CBGP, 755 Avenue du Campus Agropolis, CS 30016, 34988, Montferrier-sur-Lez Cedex, France

Authors and Affiliations

  1. Department of Entomology and Acarology, University of São Paulo, Avenida Pádua Dias 11, CP 9, Piracicaba, SP, 13418-900, Brazil

    Aline Bertin & José Roberto Postali Parra

  2. Department of Entomology, Ohio Agricultural Research and Development Center, The Ohio State University, Thorne Hall, 1680 Madison Avenue, Wooster, OH, USA

    Vitor Antonio Corrêa Pavinato

  3. Department of Entomology and Acarology, University of São Paulo – ESALQ/USP, Avenida Pádua Dias 11, CP 9, Piracicaba, SP, 13418-900, Brazil

    Aline Bertin

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  1. Aline Bertin
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  2. Vitor Antonio Corrêa Pavinato
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  3. José Roberto Postali Parra
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Correspondence to Aline Bertin.

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Bertin, A., Pavinato, V.A.C. & Parra, J.R.P. Effects of intraspecific hybridization on the fitness of the egg parasitoid Trichogramma galloi. BioControl 63, 555–563 (2018). https://doi.org/10.1007/s10526-018-9883-7

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  • DOI: https://doi.org/10.1007/s10526-018-9883-7

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