In the prairie ecozone of Alberta and Saskatchewan,
356 species of spiders in 2 I families have been
collected. The 10 families with the most species were
Linyphiidae (30%), Gnaphosidae (13%), Salticidae
(8%), Theridiidae (8%), Lycosidae (8%), Dictynidae
(6%), Thomisidae (6%), Araneidae (5%),
Philodromidae (5%) and Clubionidae (3%). These 10
families constituted 91% of the spider biodiversity. In
the grassland region ofthe prairie ecozone, there were
relatively more species of Gnaphosidae, Lycosidae,
Theridiidae, Thomisidae, Dictynidae and
Philodomidae and fewer Linyphiidae and Clubionidae
than for all provincial ecozones combined. The percentages
in the parkland region of the prairie ecozone
tended to be intermediate
