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. 2021 Nov 2;12:6217. doi: 10.1038/s41467-021-26488-1

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© The Author(s) 2021

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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Fig. 4 — Mean site-level trend in Acoustic Diversity Index, ADI (a, b), Acoustic Evenness Index, AEI (c, d), Bioacoustic Index, BI (e, f) and Acoustic Entropy, H (g, h) in 1354 1°x1° grid squares across North America between 1996 and 2017 and 715 1°x1° grid squares across Europe between 1998 and 2018. Colours indicate the size and direction of trend in each acoustic index (yellow—improving soundscape quality; blue—declining soundscape quality); note that the colour scheme is reversed for AEI, as positive trends are taken to represent a reduction in soundscape quality for this index. Site-level trends are derived from changes in standardised annual values of each acoustic index.