t/> 



C9 



3.5_ 



3.0_ 



2.5_ 



2.0_ 



1.5_ 



1.0_ 



I 



'I 



'I 



I 



|l 



I I 





WEIRS 



CONTROLS 



J F 



M 



-i — ( — ^i — * 



A M J J 



MONTH 



Figure 1. Number of ducks and coots per acre for areas influenced by weirs and controls (Spiller 

 and Chabreck 1975). 



146 



