Abstract
This study aimed to evaluate the influence of Spartocera dentiventris (Berg) (Hemiptera: Coreidae) egg quality (regarding age, size and superparasitism) on male and female body size of Gryon gallardoi Brèthes (Hymenoptera: Scelionidae). It was also analysed host size influence on offspring sex choice and female oviposition order (within egg groups). Groups of 12 eggs, 2, 3, 4, 5, 6, 7, 8, and 12 days old were individually exposed to a female parasitoid for 2 h, and the order of each egg parasitisation was recorded. Size of adult parasitoids (head width and tibia length of the second leg pair), and parasitised and superparasitised host eggs were measured. Sexual dimorphism related to size (SDs), was estimated through a model II linear regression. Females have a larger head width but a smaller tibia length. Parasitoid adult size is significantly related to host age and size. Within an egg group, females did not exhibit preference for any egg size category either to start oviposition or to oviposit male or female eggs. The body size of both sexes diminished with host aging. There was a positive response in both sexes to host size increasing. Estimated SDs diminished with host aging and increased with host volume augmentation. The results suggest that adult body size of G. gallardoi, as well as size differences between males and females, are strongly associated to host quality.
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Acknowledgements
To Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) for financial support (Process n.47057/2001-2) and fellowships conceded to first and last authors. The authors are grateful to Dra. Lúcia Maria Guedes Diefenbach for help with the English version of the manuscript.
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da Rocha, L., Kolberg, R., de Mendonça, M.S. et al. Body size variation in Gryon gallardoi related to age and size of the host. BioControl 52, 161–173 (2007). https://doi.org/10.1007/s10526-006-9024-6
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DOI: https://doi.org/10.1007/s10526-006-9024-6