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e <br />ESPEY, HUSTON & ASSOCIATES, INC. <br />LJ <br />0.36 hectares. Trapping was conducted for three consecutive nights. Each trap was <br />opened and baited with rolled oats in the evening and checked and closed each <br />morning. Each rodent captured was identified to species, aged and sexed, weighed, <br />individually marked for recapture, and released. Density estimates were calculated <br />according to Anderson (1975) - D = n/a, where <br />D =density, <br />n =number captured, and <br />a =azea of trap grid. <br />Due to the possible bias inherent in grid sampling of small azeas, as <br />suggested by compazison of the May results with results obtained by Grant and Kung <br />(1979), the trapping strategy was changed after the May survey. Since density <br />estimates were not considered important for this project, 25 traps were spaced <br />along each 1-kilometer transect. The same procedures were followed as above and <br />. population numbers were expressed as number of individuals captured/100 trap <br />nights during July and September. Due to heavy snows and no sign of rodent activity <br />in December, trapping was omitted. <br />2.2.3 Bat Mist-Netting <br />In July a 7- x 18-foot mist net was set at dusk in mazsh vegetation on <br />one of the large stock ponds. The net was checked until 0100. <br />2.2.4 GeneralGeneral Bi~Game Ground SurveyGround Survey <br />A large-mammal activity survey in the mine plan azea was conducted for <br />two days in each sampling period. The ground survey concentrated on estimating <br />deer, elk, and other lazge mammals' use of vegetation communities, springs, seeps, <br />and stock ponds. Heavy use and herd locations were plotted according to species <br />and location within habitat types (Exhibit L-1). <br />• <br />L-7 <br />