Fig. 2.

The diversity of the main spider families in the circumpolar region (those present in seven or more regions; the Other category consists of 10 families—see Table 2; note Franz Josef Land with only two Linyphiidae species is omitted for clarity). The size of the pie charts corresponds to the total richness of each area (see Table 2). Note that species richness for sub-Arctic regions consists only of alpine species, except for Canada, which includes both alpine and non-alpine species. The red dots indicate monitoring stations that target arthropods (Fig. 1, Table 1), but with those not using techniques to capture spiders removed