Northern Prairie Wildlife Research Center
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| Fig. 1. Percent of time unmarked and radio-marked female mallards were observed feeding, resting, and preening at Detroit Lakes, Minnesota and Kulm, North Dakota study sites, 22 April-30 June 1989-91. Sample sizes are given in Table 1. Error bars indicate 95% confidence intervals. |
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| Fig. 2 Nest initiation dates for unmarked and radio-marked female mallards in the prairie pothole region, 1988-91. Sample sizes were 105, 101, and 77 nests for unmarked females and 25, 57, and 80 nests for radio-marked females at study areas near Jamestown and Kulm, North Dakota, and Detroit Lakes, Minnesota, respectively. Horizontal lines indicate ranges and black squares denote means. Boxes enclose the 25th to 75th percentiles and the vertical line in each box denotes the median. |
U.S. Department of the Interior |
U.S. Geological Survey
URL: http://www.npwrc.usgs.gov/resource/birds/wildmal/figures.htm
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