. Biology of Peromyscus (Rodentia). Mice; Peromyscus. -ACTIVE—. 'ASTRONOMICAL TWILIGHT -ACTIVE— pm 6 12 6 am EST Fig. 6. Activity of P. m. bairdi in February measured as time out of nest box in enclosure with food, water, and activity wheel. To bring animals in darkness in phase, 14-hour period of greatest activity for each mouse (determined weekly) lined up in calculating average. pears to be a 10- or 11-hour period of activity, a major peak occurs at 10:00 or 11:00 , followed by a rapid drop with a slight plateau at 2:00 or 5:00 On the basis of trapping records, Burt (1940
. Biology of Peromyscus (Rodentia). Mice; Peromyscus. -ACTIVE—. 'ASTRONOMICAL TWILIGHT -ACTIVE— pm 6 12 6 am EST Fig. 6. Activity of P. m. bairdi in February measured as time out of nest box in enclosure with food, water, and activity wheel. To bring animals in darkness in phase, 14-hour period of greatest activity for each mouse (determined weekly) lined up in calculating average. pears to be a 10- or 11-hour period of activity, a major peak occurs at 10:00 or 11:00 , followed by a rapid drop with a slight plateau at 2:00 or 5:00 On the basis of trapping records, Burt (1940) noted that wild mice {P. leucopus) were most active, at least in their search for food, during the early part of the night. On the basis of live- trapping, track counts, time out of nest boxes and running in activity wheels. Falls (1953) presented histograms to show the pattern of activity of P. m. gracilis and P. m. bairdi. (In open habitats, patterns vary from those described, depending on the occurrence of strong moonlight which suppresses activity. For example, if moonlight occurs early in the night, the major peak may be delayed.) Examples are given in Figures 5 and 6. In the short nights of June, activity rose to a peak between 10:00 and midnight EST, remained fairly high through the night, and then dropped sharply after 4:00 In some records a minor peak occurred between midnight and 3:00 In September, the main peak occurred between 8:00 and 10:00 , a minor peak was. 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 King, John Arthur, 1921-. [Stillwater, Okla. ] American Society of Mammalogist
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