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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. 5 — The association between site-level in trends in the total number of species and the total number of individuals in 202737 NA-BBS sites across North America (left column) and in 16524 PECBMS sites across Europe (right column). Colours indicate site-level trends in Acoustic Diversity Index, ADI (a, b), Acoustic Evenness Index, AEI (c, d) Bioacoustic Index, BI (e, f) and Acoustic Entropy, H (g, h) (yellow—improving soundscape quality; blue—declining soundscape quality); note the colour scheme is reversed for AEI, as positive trends are taken to represent a reduction in soundscape quality for this metric. Site-level trends are derived from changes in standardised annual values of each acoustic index, total number of species, and total number of individuals.