Figure legends
Figure 1. Occurrence of three fish species as a function of catchment
area and altitude.
Figure 2. Self-organizing maps of 22 predictors with four clusters
separated by thick black lines in each figure. For example, in brook
trout occurrence is highest in cluster 3, with high-altitude sampling
sites and low annual mean temperatures (see cluster 3 in the figure).
Each sample (id, row) remains in the same SOM node (cell) in each
figure. The sample size of brown trout (255, Table 2) was higher than
that of grayling (28, Table 2), and hence the general coloring of
grayling figure in the topmost row is bluer. The size of grey circles
represents the number of samples in a cell.
Figure 3. Annual average air temperature at the sites where each of the
species occurred (N in parenthesis).