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8 <br /> Spruce-fir forest: Often dense stands of Engelmann spruce and sub- <br /> alpine fir; sometimes intermixed or replaced by lodgpole pine <br /> (Pinus contorta) or aspen (Populus tremuZoides) depending on <br /> i <br /> site conditions apd perturbations such as fire or logging. <br /> Ponderosa pine - Douglas-fir forest: Below the spruce-fir, but often <br /> intermingled with it, ponderosa pine (Pinus ponderosa) is on <br /> the drier sites, 0sually south-facing slopes and Douglas-fir <br /> (Pseudotsuga menzzesii) is on the moister sites, usually north- <br /> facing. <br /> Riparian: Along the Purgatoire River floodplain, plains cottonwoods <br /> (PopuZus sargentii) are common as are coyote willow (SaZix exigua), <br /> woods rose (Rosa woodsii) and other moisture-loving plants. Higher <br /> along stream courses, cottonwoods drop out and other species of <br /> willow become dominant; but a narrow band of riparian habitats <br /> straddle the stream courses nearly to their source. A willow carr <br /> vegetation type, recognized by Uniscale (1980) was reported for <br /> the Maxwell Mine :site. Because of its similarity of flora and <br /> fauna, I include 'it in discussions of the Riparian type. <br /> Terrestrial and Stream Habitats <br /> at or Near the Mine Sites <br /> The greatest potential for direct impacts of present and future <br /> mining activity on fish and wildlife will be on those resident species <br /> of low mobility occupying habitats within or near areas of activity. <br /> Therefore, I will discuss these habitats, their inhabitants and some <br /> 1 <br />