. The Canadian field-naturalist. 2000 AlTCHISON AND SUTHERLAND: ARACHNID COMMUNITIES IN MANITOBA 649 â c p JJi DWL DNR â SW OP habitat SB SWB Figure 4. Proportion of spiders taken per guild at each of the SIL sites. Data are shown for the four most common guilds only. Letter codes for the sites are as in text; guild des- ignations are as in Figure 2. ter, were not collected here. In clear-cut areas Jennings et al. (1988) found that lycosids were often abundant, approximately 55% of the total catch, while Eskov (1981) collected up to 35% lycosids in mead- ows. In contrast, linyph
. The Canadian field-naturalist. 2000 AlTCHISON AND SUTHERLAND: ARACHNID COMMUNITIES IN MANITOBA 649 â c p JJi DWL DNR â SW OP habitat SB SWB Figure 4. Proportion of spiders taken per guild at each of the SIL sites. Data are shown for the four most common guilds only. Letter codes for the sites are as in text; guild des- ignations are as in Figure 2. ter, were not collected here. In clear-cut areas Jennings et al. (1988) found that lycosids were often abundant, approximately 55% of the total catch, while Eskov (1981) collected up to 35% lycosids in mead- ows. In contrast, linyphiids and erigonids thrived in undisturbed, dense forest (Jennings et al. 1988; Vaisanen and Bistrom 1990). In Manitoba taiga the lycosids predominated in open areas, and the eriogo- nids and Unyphiids in more dense forested areas. Finnish taiga shares these 19 species with Mani- toban uplands: Alopecosa aculeata (Clerck), Pardosa hyperborea (Thorell), Trochosa terricola Thorell, Pityohyphantes phrygianus ( Koch), Erigone atra Blackwall, Helophora insignis (Blackwall), Microneta viaria (Blackwall), Neriene clathrata (Sundevall), Diplocentria bidentata (Emerton), Nuctenea patagiata (Clerck), Gnaphosa muscorum (L. Koch), Haplodrassus signifer ( Koch), Micaria aenea Thorell, Micaria pulicaria (Sundevall), Zelotes fratris Chamberlin, Clubiona kul- czynskii Lessert, Philodromus cespitum (Walckenaer), Misumena vatia (Clerck) and Xysticus obscurus Collett (Huhta 1965; Palmgren 1972; Hippa and Mannila 1974; Palmgren and Bistrom 1979; Niemela et al. 1996), while Siberia shares 15 species in eleven families (Koponen and Marusik 1992). By contrast, Norwegian birch forest shares one species, Xysticus obscurus (Hauge 1977). In North America the state of Maine shares 36 species in twelve families (Hillbum and Jennings 1988; Jennings et al. 1988). Fifty-seven species from Manitoba were also collected in eastern Canadian taiga of northern Quebec by Koponen (1994), including 18 species
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