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. 2020 Mar 24;10:5334. doi: 10.1038/s41598-020-62073-0

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© The Author(s) 2020

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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Annual pollen integral APIn (pollen day m⁻³) and leaf and fruit biomass (kg ha⁻¹) of European beech in percent of maximum value per site for (a) BET, (b) LAU and (c) SCH. Thresholds for definition of years with fruit abortion: not less than 1000 pollen day m⁻³; no more than 600 kg ha⁻¹ of fruits per year. Missing values in BET (2008, 2009) due to lack of litterfall measurements. BET Bettlachstock, LAU Lausanne, SCH Schänis.