FIGURE 7.

DCA ordination of the bryophyte species composition of 18 great tit nests and the 167 plots in surrounding areas. The plots were in four different sectors around each nest, positioned at increasing distances from the nests. In the upper panel, the numbers next to the nest positions show the nest's identity (box number). In nine cases, the same nest box was sampled in two different years. The lower panels show the results of the same DCA ordination for each of the nine nest boxes and plots. Each panel shows values for plots in all four sectors for the two nests in the same nest box. In some cases, plots are hidden because they have the same value as other plots.