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To examine how nutritional quality and resident gut bacteria interplay in improving the fitness of an oligophagous fruit fly,  Bactrocera minax , artificial sucrose diets and full diets (sucrose, tryptone and yeast extract) were fed to flies with and without antibiotic supplementation. Furthermore,  Klebsiella oxytoca  and  Citrobacter freundii  were supplemented to sucrose-only diets. Flies were maintained in the laboratory and the fitness parameters, male and female longevity, number of copulations and female fecundity, were recorded. Full diet without bacterial depletion significantly increased fecundity and copulation. In the absence of gut bacteria, flies fed with full diets had significantly decreased mean fecundity and copulation rate. Flies that were fed with sucrose diet had a very low copulation rate and produced no eggs. Diet type and the presence of bacteria did not have any effect on the average longevity of male and female flies. Bacterial supplementation in sucrose diets did not improve any of the measured parameters. The results demonstrate that gut bacteria interact with diet to influence mating and reproduction in  B. minax . Symbiotic bacteria significantly and positively impact reproduction in  B. minax ; however, their impact can only be fully realized when the flies are fed with a nutritionally complete diet.

The impact of nutritional quality and gut bacteria on the fitness ofBactrocera minax(Diptera: Tephritidae)