Blue Jay, Vol.43, Issue 4
SKIPPERS AND BUTTERFLIES OF THE POLICE COULEE AREA, ALBERTA HAROLD W. PIN EL, 1017 - 19 Avenue N.W., Calgary, Alberta T2M 0Z8 and NORBERT G. KONDLA, Resource Evaluation and Planning Division, Alberta Energy and Natural Resources, 530 - 8 Street S., Lethbridge, Alberta. T1J 2J8 The study area of 36 mi.2 is Township 1, ty of moisture, and soil type are key factors Range 13, west of the Fourth Meridian. The influencing plant growth on a given site. Alberta - Montana boundary forms the The change from one plant community to southern border of the study area. The nor¬ another can be abrupt and well defined, or thern end of the study area is bordered by it may be gradual and intergrading. Figures special features such as the Milk River, 1 to 3 illustrate the topography and habitats Writing-on-Stone Provincial Park and Van of the study area. Cleeve Coulee. Bisecting the study area is the north-south running Police Creek and For discussing the butterflies, it is conve¬ its spectacular associated coulee system. nient to group the habitats into four major Rising from the plains are the scenic catergories: grasslands, bare and eroding Sweetgrass Hills of Montana, immediately slopes, shrub communities and riverine south of the study area. Elevation ranges forest. from 3140 to 4000 ft. The majority of the study area is featured Two ecoregions make up the study area. by an undulating upland plain, which The northern two-thirds of the land is becomes more rolling to the south as it classified as being in the Short Grass merges into the lower slopes of the Ecoregion, and the southern third as in the Sweetgrass Hills.
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