Differences in annual population growth at increasing distances from all 304 parks.

<p>A) Annual population growth in 10 km buffer zones minus the annual population growth in 20 km buffers on the x-axis, number of protected areas on the y-axis (304 parks). If 10 km buffers were experiencing accelerated growth, most values would be greater than zero. This is not the case. B) Same as for (A), but comparing 0–20 km buffer zones with 20–40 km buffer zones. Again, there is no evidence for disproportionate population growth near protected area boundaries.