. The Canadian field-naturalist. 544 The Canadian Field-Naturalist Vol. 101 Row Row Row Row A. i C D â â ^^ fc '^~ -^c-" n â 1 Figure I. Location of Sherman live traps along logs. the trap openings faced the end with the greater diameter. Trapping was conducted from 4 August through 25 August 1982. Traps were baited with rolled oats. We set traps at eight logs for the first 4-day period and at 10 logs for each of the next four 4-day periods, resulting in a total of 2304 trap nights at 48 logs. We examined traps twice daily, once between 0800 h and llOOh and once between 1600 h and 1800 h.
. The Canadian field-naturalist. 544 The Canadian Field-Naturalist Vol. 101 Row Row Row Row A. i C D â â ^^ fc '^~ -^c-" n â 1 Figure I. Location of Sherman live traps along logs. the trap openings faced the end with the greater diameter. Trapping was conducted from 4 August through 25 August 1982. Traps were baited with rolled oats. We set traps at eight logs for the first 4-day period and at 10 logs for each of the next four 4-day periods, resulting in a total of 2304 trap nights at 48 logs. We examined traps twice daily, once between 0800 h and llOOh and once between 1600 h and 1800 h. Captured animals were identified, marked with a numbered metal ear tag (Salt Lake Stamp Co., Salt Lake City, Utah^), and released. For each log, we determined length, mean diameter (the average of measures made at points correspond- ing to each of the three trap columns), mean overhang area (the average of measurements made at each of the Row A and Row B trap stations and midway between the end-trap and mid-trap stations; see Figure 2), percentage of moss (visually estimated), percentage of bark (visually estimated), and distance to the nearest log (the shortest distance from a Row A or Row B trap station to a log with a diameter > 25 cm and length > 4 m). Each log was classified as hard or soft based on the following criteria: hard logs were cylindrical and had hard wood over at least 75% of the surface; soft logs were in a more advanced state of decay, often were not cylindrical, and solid wood constituted < 75% of the log's surface. We related the number of individuals captured per log to log length, mean log diameter, mean overhang area, percentage of bark, percentage of moss, and distance to the nearest log, using Spearman's rank correlation analysis. We also examined intercorrela- tions among the measured log characteristics. Because. 'Use of trade names does not imply endorsement or approval by the USDA Forest Service. Figure 2. Cross-section of a log showin
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