Abstract
Endosymbiotic association is frequent in insects, and endosymbionts influence a range of biological processes in these organisms. The endosymbiont–insect association and interdependence allegedly result from random selection where ecological trade-offs take place and usually differ between the involved species. Insect behavior is potentially affected by this association, but the focus in such studies is symbiont presence rather than load, and overall behavioral patterns, not the individual set of integrated behavioral tendencies (i.e., individual personality). This knowledge gap limits the understanding of how the endosymbiont–insect association affects insect behavior and how this translates into fertility, as a measure of fitness. Here, we assessed the endosymbiont load of maize weevils [Sitophilus zeamais Motschulsky (Coleoptera: Curculionidae)], which hosts two symbiont species—Sodalis pierantonius and Wolbachia, and their association with weevil personality and reproductive consequences. Thus, individual female weevils were subjected to oral administration of antibiotics (ciprofloxacin and tetracycline) to secure a range of symbiont loads, which were quantified by qPCR. Individual personality of these females was recorded before and after endosymbiont suppression, and also that of their progeny. Female weevils maintained their personality with symbiont suppression, which was not transferred to their progeny. Nonetheless, personality itself was more important in determining female reproductive output than endosymbiont load, which did not significantly alter individual integrated behavior. Thus, management tactics targeting endosymbiont suppression may not be as effective as initially anticipated, unless complete suppression of the obligatory symbiont S. pierantonius takes place.
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Acknowledgements
Appreciation is expressed to Drs. K. Haddi and G. Carvalho for the suggestions and comments provided during the study. We acknowledge the financial support provided by Minas Gerais Foundation for Research Aid (FAPEMIG), CAPES Foundation (Financial Code 001) and the National Council of Scientific and Technological Development (CNPq).
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Financial support was provided by the Minas Gerais Foundation for Research Aid (FAPEMIG), CAPES Foundation (Brazilian Ministry of Education; Financial Code 001) and the National Council of Scientific and Technological Development (CNPq; Brazilian Ministry of Science and Technology).
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Vieira, J.L., Guedes, R.N.C. Endosymbiont load, personality and reproductive output of maize weevils (Sitophilus zeamais). J Pest Sci 94, 691–701 (2021). https://doi.org/10.1007/s10340-020-01287-7
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DOI: https://doi.org/10.1007/s10340-020-01287-7