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Predicted decline in common bird and butterfly species even under conservation policy scenarios in Europe


Abstract

In response to increasing human pressures on biodiversity, conservation targets have been set to reduce these pressures and halt biodiversity decline. However, consequences of these objectives on common species are rarely studied. We analyse the effect of a range of drivers related to climate, land use and land-use intensity on 265 common bird and 144 common butterfly species from more than 20,000 sites between 2000 and 2021 across 27 European countries. We use land use and land-use intensity scenarios produced previously using the Intergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services (IPBES) Nature Futures Framework and climate change scenarios to project biodiversity drivers in Europe up to 2050. We translate these driver changes into abundance variations for common bird and butterfly species and for multi-species indicators used to monitor common biodiversity status in Europe. The projected trends relatively improve, while still declining for birds, notably farmland species, under the scenarios meeting conservation objectives, with few effects on butterflies. No scenario shows a stop or a reversal in the average decline in abundance of bird and butterfly species. Our results therefore question the common biodiversity future under current conservation policies and highlight the need for other anticipatory frameworks not implicitly based on a growing need for natural resources.

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Fig. 1: Workflow of the analyses.
Fig. 2: Effects of change in climate variables, change in land-use variables and of land-use intensity variables on temporal trends at the European level on common birds and butterflies.
Fig. 3: Predicted changes in scenarios in 2050 at the European scale in land use, land-use intensity and climate.
Fig. 4: Observed and predicted abundance trends of common bird and butterfly indices in Europe between 2000 and 2050.
Fig. 5: Mean annual trend in abundance of common bird indices by biophysical region.
Fig. 6: Mean annual trend in abundance of common butterfly indices by biophysical region.

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Subjects

  • Biodiversity
  • Conservation biology
  • Socioeconomic scenarios

Data availability

Monitoring data used in this study are available upon request of the Pan-European Common Bird Monitoring Scheme (https://pecbms.info/) and the European Butterfly Monitoring Scheme (https://butterfly-monitoring.net). The other data used are publicly available and have been cited in the main text and references. The data produced are available via Zenodo at https://doi.org/10.5281/zenodo.20605816 (ref. 118) and the Shiny application (https://press-com-bio.sk8.inrae.fr/). The figures were produced using the R software (version 4.4.3)119 and formatted using the Inkscape software (version 1.4.2)120.

Code availability

The R script (R software version 4.4.3119) is available via Zenodo at https://doi.org/10.5281/zenodo.20605816 (ref. 118).

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Acknowledgements

We would like to express our sincere gratitude to all the volunteers who provided data to the programme, without whom this research would not have been possible. We would also like to thank the European and national programme coordinators for organizing the monitoring programmes in their countries and collecting the data that directly contributed to this research and national funding agencies for financially supporting these programmes. We would finally like to thank M. Baragatti for helpful methodological discussions.

Funding

This study was partially funded by the BioAgora project funded by the European Union’s Horizon Europe Research and Innovation Programme (grant agreement number 101059438), the Horizon Europe project ECO2ADAPT (grant agreement number 101059498) and wildE (GAP-101081251) and the Beyonds project funded by the French Research Foundation on Biodiversity.

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S.R.: conceptualization, methodology, formal analysis and writing–original draft. M.L.: conceptualization, methodology and writing–review and editing. L.T.: conceptualization and writing–review and editing. S.L.: conceptualization, supervision, writing–review and editing and funding acquisition. T.B.: methodology and writing–review and editing. H.A., A.A., M.B., M.P.B., L.B., T.C., B.F., Z.F.F., A.G., S.H., J.A.K., J.K., P.K., M.K., A.L., D.M., X.M., M.M., I.J.Ø., L.B.P., J. Reif, J. Rüdisser, M.Š., J.S., R.S., C.S., B.G.S., N.S., N.T., S.T. and C.v.S.: provide national monitoring database and writing–review and editing.

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Correspondence to
Stanislas Rigal.

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Nature Ecology and Evolution thanks Nina Farwig, Stephanie Roilo and the other, anonymous, reviewer(s) for their contribution to the peer review of this work. Peer reviewer reports are available.

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Extended data

Extended Data Table 1 Details on the time period used for biodiversity, environmental and driver data
Full size table

Extended Data Fig. 1 Geometric mean of species temporal trend between 2000 and 2021 (Past) and in the different scenarios (BAU, SSP1, NFN, NFS, NAC).

a) Common Birds index (n = 223), b) Farmland Bird index (n = 34), c) Forest Bird index (n = 29), d) Common Butterfly index (n = 135), e) Grassland Butterfly index (n = 12) and f) Woodland Butterfly index (n = 28). 95% confidence intervals from geometric standard error and the significant differences between scenarios are displayed (two-sample t-test, * p-value < 0.05, ** p-value < 0.01, *** p-value < 0.001).

Extended Data Fig. 2 Climate variable and changes by biophysical region.

a) Mean spring temperature (°C) in recent period (2016-2021), b) amount of spring precipitation (mm) in recent period, c) mean spring temperature variance in recent period, d) expected change in mean spring temperature (°C) between 2050 and recent period, e) expected change in amount of spring precipitation (mm) between 2050 and recent period, f) expected change in mean spring temperature variance between 2050 and recent period. Outline area of the study from Eurostat104 under a Creative Commons license CC BY 4.0.

Extended Data Fig. 3 Landscape diversity and changes by biophysical region.

a) Current landscape Shannon diversity, b) change in landscape diversity in SSP1, c) NFN, d) NFS, e) NAC. Outline area of the study from Eurostat104 under a Creative Commons license CC BY 4.0.

Extended Data Fig. 4 Share of area cover by forests under low and medium intensity management and changes by biophysical region.

a) Current cover of low and medium intensity forest, b) change in cover of low and medium intensity forest in SSP1, c) NFN, d) NFS, e) NAC. Outline area of the study from Eurostat104 under a Creative Commons license CC BY 4.0.

Extended Data Fig. 5 Share of area cover by forests under high intensity management and changes by biophysical region.

a) Current cover of high intensity forest, b) change in cover of high intensity forest in SSP1, c) NFN, d) NFS, e) NAC. Outline area of the study from Eurostat104 under a Creative Commons license CC BY 4.0.

Extended Data Fig. 6 Share of area cover by farmland under low intensity management and changes by biophysical region.

a) Current cover of low intensity farmland, b) change in cover of low intensity farmland in SSP1, c) NFsN, d) NFS, e) NAC. Outline area of the study from Eurostat104 under a Creative Commons license CC BY 4.0.

Extended Data Fig. 7 Share of area cover by farmland under high intensity management and changes by biophysical region.

a) Current cover of high intensity farmland, b) change in cover of high intensity farmland in SSP1, c) NFN, d) NFS, e) NAC. Outline area of the study from Eurostat104 under a Creative Commons license CC BY 4.0.

Extended Data Fig. 8 Distribution of monitoring sites and transects included in this study.

a) Sites from the Pan-European Common Bird Monitoring Scheme (15,731 sites in 27 countries) and b) transects from the European Butterfly Monitoring Scheme (4,959 transects in 15 countries). This corresponds to sites and transects visited more than 5 years and for the last time in 2011 or later. The grey area represents the European countries included in this study. Outline area of the study from Eurostat104 under a Creative Commons license CC BY 4.0.

Supplementary information

Supplementary Information (download PDF )

Supplementary Materials 1–4.

Reporting Summary (download PDF )

Peer Review File (download PDF )

Supplementary Data 1 (download CSV )

Bird species lists and coefficients.

Supplementary Data 2 (download CSV )

Butterfly species lists and coefficients.

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Rigal, S., Lenormand, M., Tardieu, L. et al. Predicted decline in common bird and butterfly species even under conservation policy scenarios in Europe.
Nat Ecol Evol (2026). https://doi.org/10.1038/s41559-026-03139-6

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