Fig. 2: Species population trend versus protected area cover.
From: Expanding protected area coverage for migratory birds could improve long-term population trends
Relationship between 30-year Pan-European Common Bird Monitoring Scheme (PECBMS) trend and the average percentage of a species summed occurrence in a protected area in Europe (over all weeks where the species summed occurrence is equal to or above 25% of the maximum summed occurrence). The dots are the raw data, the solid line is the prediction (back-transformed to percentage change from log ratio) from the linear regression model of trend against protected area coverage (ß = 0.052 ± 0.015, n = 28, df = 25, p = 0.0019) and species range size when range size is set to the mean value across all species (3,619,119 km2). The dots are labelled with species codes which can be found in Supplementary Table 2 and coloured according to migration strategy with short-distance migrants in blue and long-distance migrants in grey. The dotted lines are the upper and lower 95% confidence intervals. The dataset used in this figure is available in Source Data.
