Figure 6. Relationship between Pheidole obscurithorax nest densities measured at 21 sites in Tallahassee in two years (Spearman rank correlation, r = 0.5, P < 0.05). Each number in parentheses is the number of sites represented by the point to its left. Dashed line signifies no change in density (isometric population growth); sites on the line did not change in density (n = 7), sites above the line increased in density (n = 13), and site below the line decreased in density (n = 1).