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Figure 1. Major waterfowl wintering regions within California used by adult female northern pintails radiotagged in the Sacramento Valley, California, and monitored 25 August-28 February 1987-90. Delta refers to the Sacramento-San Joaquin River Delta, NWR is national wildlife refuge, and SWA is state wildlife area. |
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Figure 2. Kaplan-Meier survival distribution of wintering adult female northern pintails radiotagged in Sacramento Valley, California, and monitored 25 August-28 February 1987-90. |