Extended Data Fig. 3: Age, area, and type of protected areas had negligible effect on trends (n = 930 time series). | Nature

Extended Data Fig. 3: Age, area, and type of protected areas had negligible effect on trends (n = 930 time series).

From: Protected areas slow declines unevenly across the tetrapod tree of life

Extended Data Fig. 3: Age, area, and type of protected areas had negligible effect on trends (n = 930 time series).The alternative text for this image may have been generated using AI.

We evaluated the effect of age, area, and type (IUCN category) of protected areas (PAs) on vertebrate trends using a multilevel model wherein we controlled for variables used in pre-analysis matching in addition to governance, regional rates of climate change, and land use change. The model was fit to a subset of population trends that occurred only within PAs. Records with missing values for PA age or area were excluded from the analysis. Points represent mean estimates from a multilevel model and error bars represent 80% (thick) and 95% (narrow) Bayesian credible intervals. Asterisks indicate statistical support for effects – 95% BCIs exclude zero.

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