. The Canadian field-naturalist. 536 The Canadian Field-Naturalist Vol. 103. Figure 1. Map of the eastern shore of James Bay showing the main sampling sites: A: Lac Attila and Riviere Desaulniers, B: Riviere au Castor, C: Lac Sakami, D: Riviere Opinaca, E: Lac Low. between 100 and 200 m. The region is part of the Eastmain and Larch Lowlands. Following the last ice age, much of the area was covered by the Tyrrell Sea (Figure 3), an extension of Hudson and James Bays. The glaciers retreated and re-extended many times, the final retreat some 8000 years ago. The landscape is dominated by rolling h
. The Canadian field-naturalist. 536 The Canadian Field-Naturalist Vol. 103. Figure 1. Map of the eastern shore of James Bay showing the main sampling sites: A: Lac Attila and Riviere Desaulniers, B: Riviere au Castor, C: Lac Sakami, D: Riviere Opinaca, E: Lac Low. between 100 and 200 m. The region is part of the Eastmain and Larch Lowlands. Following the last ice age, much of the area was covered by the Tyrrell Sea (Figure 3), an extension of Hudson and James Bays. The glaciers retreated and re-extended many times, the final retreat some 8000 years ago. The landscape is dominated by rolling hills of gneiss and granite interspersed with shallow glacial deposits (mainly clay and moraine), small glacial lakes, many aligned on an east-west axis, and many bogs. The terrestrial vegetation is dominated by open forests (10 to 55% cover) of Black Spruce (Picea mariana) (mean height 9 m) with an undercover of mosses and Ledum (Anonymous 1978). The waters are slightly acidic (pH ), unmineralized (conductivity = 14-38 umhos) and soft (hardness < 14 mg/L); phosphates are rare (< mg/ L), but total organic carbon is relatively high (4-19 mg/L). Surface temperatures reach 20°C in the summer. The Fauna Table 1 lists the 220 species from the three orders collected at the James Bay sites. Also indicated are each species' geographical distribution and its occurrence at comparison sites. The geographical distributions are grouped into somewhat arbitrary types which for the most part follow Scudder (1979) and Nimmo (1971) and are based on commonly observed patterns; representative patterns are illustrated in Figure 2. In instances where it was not possible to assign a species to only one type, it was tallied in two categories, each as a half-Unit. Continental (CI): species which are found throughout most of North America, except in extreme environments. Northern transcontinental (NT): species inhabiting the northern part of the continent, some extending south of the g
Size: 1805px × 1384px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorottawafi, bookcentury1900, bookdecade1910, bookyear1919
