Fig. 1. Changes in the slope, m, of the semi-logarithmic species-area relationship in British breeding birds along environmental gradients: species richness measured in (a) 10 km and (b) 290 km quadrats, (c) the rate at which broadscale habitat diversity increases from a 10 km to a 290 km quadrat, (d) temperature (10 km quadrat), (e) annual NDVI (10 km quadrat), and (f) human population density (10 km quadrat).