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. 2017 Nov 9;7:15132. doi: 10.1038/s41598-017-15308-6

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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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The arena used to test activity, motor functions, and movement to light of foragers. A bee is drawn approaching the light near the top of the arena. The amount of light (left: luminous flux (lux); right: Photosynthetic Photon Flux Density (µmol m⁻² s⁻¹); mean ± standard error) at the centre of the arena, directly below the light, is shown for each level. The oval at the base of the arena shows the position of the temperature (T) and relative humidity (RH) sensor.