Northern Prairie Wildlife Research Center
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| Figure 1. Survival curves of radiomarked canvasback ducklings at the Agassiz National Wildlife Refuge, 1987-90. Curves labeled with CENSOR indicate survival values when symptomless transmitter failures were treated as censored and curves labeled with DEATH indicate survival values when symptomless transmitter failures were treated as deaths. Sample sizes were as follows: 1987, 10 females, 12 males; 1988, 20 females, 23 males; 1989, 52 females, 44 males; 1990, 33 females, 23 males. |
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| Figure 2. Relation of canvasback duckling mortality with weather patterns at the Agassiz National Wildlife Refuge, 1989. The solid line depicts daily mean temperatures. Shading extends below cloud on days with precipitation. Daily mortality rates of canvasback ducklings are represented by solid bars. |
U.S. Department of the Interior |
U.S. Geological Survey
URL: http://www.npwrc.usgs.gov/resource/birds/radiomrk/figures.htm
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