﻿Table 5. (continued) 



Speci es 



Total number known present during census period 

 Dec- July- 



Jan. April May Aug. 



Present in large numbers but no count made. 



Seasonal variation in numbers of species encountered during project area censuses 

 each month is shown in figures 1 and 2. Study data show that the number of 

 water-related bird species (waterfowl, shorebirds, herons, gulls, ospreys, bald eagle 

 dippers, belted kingfishers) remains relatively constant year round, with a slight 

 increase during the breeding seeson. The number of species of other birds, elthough 

 relatively high throughout the year, increases considerebly during the breeding seasoi 



Census resuLts for the dipper are shown in figure 3, and variations in average 

 monthly abundance of the most common waterfowl species, as determined by the censuses 

 are portrayed in figure 4. Seasonal variations in duck numbers are shown in figure 5 

 This figure shows that river sections M and N (see appendix B) ere the most heavily 

 used by weterfowl, especially in April. 



21 



