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. 2019 Mar 12;9:4253. doi: 10.1038/s41598-019-40396-x

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© The Author(s) 2019

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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The responsiveness of worker honey bees to antennal (A; n = 89) and proboscis (B; n = 21/treatment group) stimulation with water, sucrose, and sucrose contaminated with cadmium chloride and the effect of pretreatment with cadmium chloride on the sucrose response threshold in treated and control bees (C; n = 28/treatment group). For the assay testing the bees’ responsiveness to antennal stimulation with cadmium-contaminated sucrose solutions and the assay testing the sucrose response threshold following cadmium pretreatment, the percentages of bees exhibiting the proboscis extension reflex (% PER) are shown. For the assay testing the bees’ responsiveness to proboscis stimulation with cadmium-contaminated sucrose solutions, the percentages bees that consumed the whole droplet of each test solution (% consuming whole droplet) are shown. For the assay testing sucrose response thresholds in pretreated and control bees, mean DC indicates the mean value of the discrimination code. Bonferroni-corrected pairwise comparisons are indicated: ***p < 0.001, **p < 0.01, *p < 0.05.