Abstract
This study investigates the influence of biotic and abiotic factors associated with the morphological development of Brevicoryne brassicae (Linnaeus) and the associated hyperparasitoid Alloxysta fuscicornis (Hartig). The experiment involved the examination of whether aphid size was influenced by their vertical distribution and density on the host plant, as well as whether variations in hyperparasitoid size and symmetry were correlated with those of their aphid hosts. An aphid multivariate size index was obtained using principal component analysis, while symmetry was evaluated in terms of fluctuating asymmetry (FA). Samples were collected in 2007 on cabbage plants cultivated at an experimental farm located in Uberlândia, Minas Gerais, Brazil (18°56′54″ S; 48°12′46″ W). The results demonstrated that the size of B. brassicae was negatively associated with temperature, but not with its vertical distribution on the host plant. Temperature was also negatively correlated with hyperparasitoid size. During warmer periods, females produced large quantities of small-sized offspring, whereas an opposite pattern, i.e. the production of fewer offspring of larger size took place during colder periods. This type of adjustment involving trade-offs between physiological and morphological mechanisms, as well as individual interaction with abiotic environmental factors, such as temperature, can be considered an adaptive plastic response in order to increase the chances of survival at a given locality. The encountered relationship between aphid and hyperparasitoid sizes may be an after effect of their indirectly biotic interaction. Hyperparasitoid FA was dependent on the width of the mummified aphids. However, the hypothesis that temperature and vertical distribution on the host plant might influence FA was not confirmed.
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Acknowledgments
We thank CAPES for the scholarship granted to KCL Souto, FAPEMIG for the financial support provided via PROJECT Nº EDT-286/07 and finally CAPES, CNPq and FAPESP for providing financial support to INCT-HYMPAR/SUDESTE.
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Edited by Fernando L Cônsoli – ESALQ/USP
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Souto, K.C.F.L., Sampaio, M.V., Pedroso, H.L. et al. Biotic and Abiotic Factors Affecting Brevicoryne brassicae (L.) (Hemiptera: Aphididae) and the Associated Hyperparasitoid Alloxysta fuscicornis Hartig (Hymenoptera: Figitidae) Morphologies. Neotrop Entomol 41, 272–277 (2012). https://doi.org/10.1007/s13744-012-0047-7
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DOI: https://doi.org/10.1007/s13744-012-0047-7