. The Canadian field-naturalist. Natural history. 1997 Crete, Huot, Fortin, and Doucet: Diversity on New Reservoir Islands 409 gneissic rock, and covered with glacial deposits (Rowe 1972). The annual temperature averages °C and precipitation reaches 650 mm, with 40% falling as snow. The growing season lasts 130 days, with a frost-free period of 60-80 days (Wilson 1971; Environment Canada 1986). Vegetation is typical of the northern boreal forest and consists of open woodlands, dominated by Black Spruce (Picea mariana) and Jack Pine {Pinus banksiana), with a lichen carpet (Gerardin 1980). Na
. The Canadian field-naturalist. Natural history. 1997 Crete, Huot, Fortin, and Doucet: Diversity on New Reservoir Islands 409 gneissic rock, and covered with glacial deposits (Rowe 1972). The annual temperature averages °C and precipitation reaches 650 mm, with 40% falling as snow. The growing season lasts 130 days, with a frost-free period of 60-80 days (Wilson 1971; Environment Canada 1986). Vegetation is typical of the northern boreal forest and consists of open woodlands, dominated by Black Spruce (Picea mariana) and Jack Pine {Pinus banksiana), with a lichen carpet (Gerardin 1980). Natural fires have occurred, on average, at 100-year intervals during recent centuries (Payette et al. 1989). In well drained areas on the mainland around the LG-3 reservoir, 17 species of woody plants, 8 species of small mammals and 26 species of nesting passerines were found in forest stands of varying ages (Crete et al. 1995). However, when considering only mature stands, richness decreased to 14 species of woody plants, 5 of small mammals and 10 of nest- ing passerines. Only islands covered with mature forests were chosen to eliminate variability from fire succession. We selected 10 reservoir islands and matched them to 10 comparable islands within two large natural lakes: six in Lac de la Montagne du Pin and four in Lac Patukami (Figure 1). Islands selected in LG-3 reservoir were former hilltops isolated from the mainland when the reservoir was flooded in 1982. Reservoir islands were chosen so that their size and distance from the mainland could be matched with those of lake islands. Reservoir islands covered from 9 to 82 ha (average (x) = 28 ha ± standard error () = 7) as compared to 10 to 62 ha (x = 28 ± 6) for lake islands. Minimum distance from the shore. Figure 1. Location of the study area in northwestern Quebec and of the 20 islands where passerines, small mammals and woody plants were Please note that these images are extracted from scanned page ima
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