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. 2017 Oct 18;7:13420. doi: 10.1038/s41598-017-13705-5

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Drosophila preference for fermentation correlated with sucrose consumption and bacterial population. (a) The concentration of sucrose and viable bacterial cells in fly food. The concentrations of sucrose reduced over time, while bacterial density increased. n = 12, one of three replicates. (b) Drosophila temporal oviposition preference for fermentation. n = 16, one of three replicates. (c,d) The relationship between sucrose consumption, bacterial density and Drosophila oviposition preference for fermentation. A linear standard curve with an unconstrained slope was generated and compared to a null model with slope = 0. Each data point represents sucrose concentration or viable cell number of fly food along with the mean oviposition index value toward fermentation. A semilog standard curve with an unconstrained slope was generated and compared to a null model with slope = 0. The data fit to an unconstrained slope better than to the null model (For sucrose consumption: p < 0.0001, slope = −0.95; for bacterial density: p < 0.0001, slope = −0.95). ANOVA tests with LSD post hoc analysis. Mean ± SEM. Symbols: NS p > 0.05; **p < 0.01; ***p < 0.001.