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. 2018 Mar 2;8:3927. doi: 10.1038/s41598-018-22258-0

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© The Author(s) 2018

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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Variation with latitude in time series length (A) and the first year of observation (B) for studies upon which phenological trend estimates used in this analysis were based. Both panels include studies reporting statistically significant and non-significant phenological trends. Hence, high latitude studies of phenology have been of significantly shorter duration and more recent than lower latitude studies.