Effects of Harness Transmitters on Behavior and Reproduction of Wild Mallards
Figures
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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. |
 |
| 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. |
