TABLE F-34,--Wood duck nest box utilization, Ohio, 1960 and 1961 


Number of usable boxes-----~ 


Number of boxes used-------- 
Percentage used---------~---- 
Blue-winged teal 
Black duck 

Note.--No brood studies were conducted in 1960. 
TABLE F-36, --Duck nesting effort and production data, Missouri, 1953-61 



Percent change 
from 1960 











Lake and marsh censused (acres)------ 
Streams censused (miles)------------- 
Wood: duck: 
Nesting effort: 
i) 
~ 
a 


Per sq. mi. of lake and marsh---- 5.8 -41 
Per mile of stream--------------- «24 +145 
Broods per mile of stream-------- 09 +300 
Average mumber of ducklings in--- ; 
Class J[~««+--------------------=- 9 =-20 
Class I] ------------=------------ 4 -11 
Class III --------«-<-+---+------ 6 +34 
All classes--+---------+--------- 5 -18 
Mallard and blue-winged teal: 
Nesting effort: 
Per sq. mi. of lake and marsh---- +22 
Per mile of stream---~-------«--- 
122 ceo 9 19138 
— 
