Abstract
The biodiversity impacts of agricultural deforestation vary widely across regions. Previous efforts to explain this variation have focused exclusively on the landscape features and management regimes of agricultural systems, neglecting the potentially critical role of ecological filtering in shaping deforestation tolerance of extant species assemblages at large geographical scales via selection for functional traits. Here we provide a large-scale test of this role using a global database of species abundance ratios between matched agricultural and native forest sites that comprises 71 avian assemblages reported in 44 primary studies, and a companion database of 10 functional traits for all 2,647 species involved. Using meta-analytic, phylogenetic and multivariate methods, we show that beyond agricultural features, filtering by the extent of natural environmental variability and the severity of historical anthropogenic deforestation shapes the varying deforestation impacts across species assemblages. For assemblages under greater environmental variability—proxied by drier and more seasonal climates under a greater disturbance regime—and longer deforestation histories, filtering has attenuated the negative impacts of current deforestation by selecting for functional traits linked to stronger deforestation tolerance. Our study provides a previously largely missing piece of knowledge in understanding and managing the biodiversity consequences of deforestation by agricultural deforestation.
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Data availability
All data used in this study have been uploaded to a public repository, and can be accessed at https://doi.org/10.5281/zenodo.10031327 (ref. 31).
Code availability
All code used in this study have been uploaded to a public repository, and can be accessed at https://doi.org/10.5281/zenodo.10031327 (ref. 31).
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Acknowledgements
We thank all co-authors of the primary studies that enabled the generation of original data included in this study, Y. Chen for providing advice on spatial data extraction, L. Roudart for granting permission to use their map on agricultural history (Extended Data Fig. 3c, cited from ref. 81), and the following primary-study authors for help with data compilation: X.-B. Gao, D. S. Karp, O. Norfolk, N. O’Dea, B. Phalan, and T. R. S. Raman. We thank members of the ConservationEE research group at Peking University for helpful discussions and support, and M. G. Betts for constructive comments that improved the quality of earlier versions of the article. This project was funded by the National Natural Science Foundation of China (grants 32122057 and 3198810 to F.H.) and the Ministry of Science and Technology of China (grant 2022YFF0802300 to F.H.), and received further support from the Tsinghua University Initiative Scientific Research Program (grant 20223080017 to L.Y.).
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Contributions
F.H. conceived the study and led the study design. W.W. compiled species-level abundance data and associated meta-data with assistance from all co-authors. W.W. compiled species trait data with assistance from S.L. and X.M. F.H. designed and coded data analysis with assistance from S.N. and P.R.E., and along with W.W. implemented all analyses. F.H. designed visualization of the results, and along with W.W. implemented visualization of the results. F.H. wrote the first draft of the article with assistance from W.W. and S.N., and all authors contributed to revisions of the article.
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Extended data
Extended Data Fig. 1 PRISMA plot for data compilation.
Reference information for the two databases and reviews consulted is provided in Extended Data Table 1.
Extended Data Fig. 2 Additional information on the range of data covered by our database.
As with Fig. 2, circles represent datasets of entire avian assemblages for agriculture-forest pairs contributed by each primary study, sized proportional to the number of avian assemblages and colored by (a) MAP, (b) seasonality, and (c) disturbance regime of the study system, as well as (d) remnant forest cover, distance to (e) the nearest continuous forest and (f) native forest surveyed for the agricultural sites in each primary study.
Extended Data Fig. 3 Geographical patterns of three filtering factors across the world.
(a) MAP, (b) temperature seasonality, and (c) agricultural history. Data for temperature seasonality and MAP are from WorldClim 2.139. Map boundaries in c show the centres of origin and areas of expansion of the Neolithic Agricultural Revolution, as reproduced with permission from ref. 81, Monthly Review Press.
Extended Data Fig. 4 Evidence that the influence of filtering on the observed impacts of agricultural deforestation was not an artefact of confounding variables or publication bias.
(a–d) The relationship between the four filtering variables and comparison type (left part) or study season (right part). While none of the filtering factors had no strong collinearity with comparison type, for at least MAP and agricultural history, there appeared to be some difference between breeding/all-year versus non-breeding seasons. (e, f) We therefore focused on a subset of data concerning the breeding season only (80% of all data) to visually assess the relationship between assemblage RR with MAP and agricultural history, using the same graph format as in Fig. 3. This subset of data also showed the negative effect of MAP (Fig. 3d) and the positive effect of agricultural history (Fig. 3e) on assemblage RR that were found by formal meta-regressions, suggesting that these effects were not spuriously driven by possible collinearity between filtering variables and study season. (g) Funnel plot for meta-analysis, based on effect size (RR) and study size (sampling effort; measured as the study duration in months). The dotted vertical line represents the mean effect size indicated by meta-analysis (that is corresponding to the mean of Fig. 3A, upper row). (h) The relationship between assemblage RR and the distance of agricultural sites to their matching native forests. We represented distance by the smallest distance from any sampling unit of the agricultural sites to matching native forest sites, with ‘close’ representing distances ≤1 km and ‘far’ those >1 km. This visual assessment showed that greater assemblage RR was not associated with shorter distances between agricultural sites and native forests, corroborating our main findings based on the FGP map data that distance to nearest continuous forest did not drive variation in biodiversity responses to agricultural deforestation.
Extended Data Fig. 5 Diagnostic plots for meta-analyses and meta-regressions corresponding to (a) Fig. 3a, (b) Fig. 3b, and (c) Fig. 3c–e.
For (a) and (b), residual plots (upper) and Q-Q plots (lower) are displayed for each of the meta-analyses concerning all agricultural types (left column), agroforestry (middle column), and open agricultural systems (right column) displayed in Fig. 3a, b. For (c), the residual plot (upper) and Q-Q plot (lower) correspond to the meta-regression global model.
Extended Data Fig. 6 Diagnostic plots for the phylogenetically controlled mixed-effect model on the relationship between species-level RR and predictor variables, run on one randomly drawn phylogenetic tree.
Plots for all variables other than generation length were from a model that dropped generation length, while the plot for generation length was from a model that dropped body mass. Pairs of plots on the trace (left) and density (right) of posterior estimates are displayed for each fixed factor and random factor including residual variance, or ‘Units’ (in dashed box).
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Hua, F., Wang, W., Nakagawa, S. et al. Ecological filtering shapes the impacts of agricultural deforestation on biodiversity. Nat Ecol Evol 8, 251–266 (2024). https://doi.org/10.1038/s41559-023-02280-w
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DOI: https://doi.org/10.1038/s41559-023-02280-w
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