Survival of Radiomarked Canvasback Ducklings in Northwestern Minnesota
Tables
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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. |
