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. 2020 Aug 31;21:596. doi: 10.1186/s12864-020-07020-z

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© The Author(s) 2020

Open AccessThis 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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 4 — Light masking of locomotor behaviour. Double plots of median locomotor activity (± SEM) per 30 min bin during 3 days in a 12:12 LD cycle followed by 4 days in DD. (N*, black, n = 71; D*, red, n = 130; C*, Blue, n = 110). Shades indicate light-off. Yellow dashed lines delineate subjective nights. The overall ANOVA between 4 days in LD and 4 days in DD conditions (starting from the second day in DD) indicates a significant effect of the light regime (i.e., LD vs. DD; F_1,594 = 105.03, p < 0.0001) and genotype (F_2,594:173.01, p < 0.0001). The interaction genotype × environment was also significant (F_2,594:102.66, p < 0.0001). Post-hoc analysis (TukeyHSD text) revealed that both N* and C* flies became significantly more “diurnal” when released into constant conditions (N* p < 0.0001; C* p < 0.001). The ND ratios of D* flies did not significantly change in DD conditions (p = 0.94, NS)