Northern Prairie Wildlife Research Center
Figure 2. A grid map of Manitoba, divided by degrees of latitude and longitude defining the labelled squares used to refer to collection localities in the checklist. C = Churchill, SIL = Southern Indian Lake. T = Thompson, TP = The Pas, GR = Grand Rapids, D = Dauphin, TBS = Taiga Biological Station, B = Brandon, and W = Winnipeg.
The biodiversity of species in this province is apparent in a comparison of the provincial land mass (6.5% of Canada) (Payne et al., 1975) with the percentage of the total species within the country; our 483 species represent 37% of the total species in Canada (Dondale, 1979). Likewise we have 20 families, or 59% of those recorded for the country.
In Table 1, we compare Manitoba's spider fauna with that of other Canadian provinces. The Manitoban fauna of 483 species in 20 families compares with British Columbia's 567 species in 28 families (West et al., 1984, 1988), Quebec's 553 species in 19 families (G. Belanger & R. Hutchinson, unpublished data), and Newfoundland's 273 species in 17 families (Hackman, 1954; L. Hollett, unpublished data). If the comparison is based on total species within pairs of provinces, Manitoba shares 253 species (32%) with British Columbia, 371 species (56%) with Quebec, and 203 species (37%) with Newfoundland. We infer that the Manitoba spider fauna is more similar to that of eastern Canada than to that of British Columbia.