During 1996 we examined whether providing predators with supplemental food would reduce predation on duck nests at 10 North Dakota sites. We randomly selected 5 sites to serve as treatment sites where supplemental food (chicken eggs) was provided at feeding stations during the duck-nesting season. The remaining 5 sites served as controls with no supplemental food. During Experiment 1 we distributed approximately 320 chicken eggs/site/week during May and early June, but daily survival rates (DSR) of nests at treatment sites (x̄ = 0.891, SE = 0.018) and control sites (x̄ = 0.939, SE = 0.001) did not differ (F1,4 = 6.54, P = 0.06). During Experiment 2, we distributed 1,600 chicken eggs/site/week in late June and July, but DSR at treatment sites (x̄ = 0.941, SE = 0.016) and control sites (x̄ = 0.954, SE = 0.008) again were similar (F1,4 = 0.72, P = 0.44). Our results indicate that supplemental feeding of predators is ineffective at reducing predation rates on upland duck nests.
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