. The Canadian field-naturalist. 1992 Berger and Baydack: Effects of Succession on Sharp-tailed Grouse 187 o a u H < B o < m. 7 8 9 10 12 18 19 1 5 11 LEK Leks 2, 3, 7, 8, 9, 10, 12 - Abandoned Leks 18, 19-New Leks 1,5, 11 - Permanent Figure 2. Lek status and habitat change (1970-1986) in the Narcisse Wildlife Area, Manitoba Aerial photographs were interpreted and mapped with a Bausch and Lomb Zoom Transfer Scope. Using a numerical vegetation classification system (Sexton and Dixon 1978), habitat types were labelled, boundaries were delineated, and the map transferred to mylar. The total
. The Canadian field-naturalist. 1992 Berger and Baydack: Effects of Succession on Sharp-tailed Grouse 187 o a u H < B o < m. 7 8 9 10 12 18 19 1 5 11 LEK Leks 2, 3, 7, 8, 9, 10, 12 - Abandoned Leks 18, 19-New Leks 1,5, 11 - Permanent Figure 2. Lek status and habitat change (1970-1986) in the Narcisse Wildlife Area, Manitoba Aerial photographs were interpreted and mapped with a Bausch and Lomb Zoom Transfer Scope. Using a numerical vegetation classification system (Sexton and Dixon 1978), habitat types were labelled, boundaries were delineated, and the map transferred to mylar. The total area under investiga- tion at each lek equalled km-. Vegetation pat- terns surrounding 12 lek locations were analyzed over the 21 year mapping period. Areas were measured with a Calcomp 9100 Digitizer. The scale of each map was measured and set using the scale bar method. The total area of each habitat type was determined and its percentage cover calculated (Estes and Thorley 1983). Sources of error from photographic interpretation and measurement were estimated as follows. Samples of five different areas were drawn indepen- dently of one another, each area having a similar shape and size. These five samples were pooled, and error expressed as percent error or as + km-. Pooled Table 1. Distribution of habitat types in the Narcisse Wildlife Management Area, Manitoba, from 1965-1986. Leks Prior to Average Change Cover type Abandoned Leks Abandonment Permanent Leks on All Leks Aspen Closed Forest 56% 43% 44% Aspen Open Forest 14% 12% 15% Prairie and Abandoned Fields 15% 28% 23% (-) Shrub 12% 15% 17% Marsh 3% 2% • 1% (-) Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ottawa Field-Naturalists' Club. Ottawa, Ottawa Field-Naturalists' Club
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