The effect of altered streamflow The effect of altered streamflow on migratory birds of the Yellowstone River Basin, Montana effectno7yellowofalteredrich Year: 1977 \ / ) ? \ \ I Annual Number of Migrating Mallards 501,000-1,000,000 'jyft'J 251,000-500,000 [â â¢;.:â ;.:] 76,100-250,000 1 I 10,000-26,000 * Banding Location r -/c-2 i i t AZ 1 1 1 \ x i â Figure 19. Mallard migration corridors in relation to banding locations of mallards harvested in the lower Yellowstone River Basin in 1973 through 1975. 52

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