Table I. - Wood Duck Nesting Box Success at Lake Odessa, Louisa County, Iowa. 
Number of nesting boxes 
available 
Number of nesting boxes 
occupied 
Number of nests destroyed 
by flood 
Number of eggs destroyed 
by flood 
Total number of potentially 
successful eggs 
Number of successful nests 
1950 
26 
18 
158 
1] 
Number of ducklings success- 
fully hatched 
i129 
1951 
36 
13 pre-flood 
9 post flood 
13 
108 wood duck 
72 wood duck 
0 merganser 
68 
1952 
24 
18 
237* wood duck 
38 merganser 
9 x 
? ei 
1953 1954 
30 72 (22 wood type) 
(50 metal type) 
15 11 (7 wood duck) 
(4 merganser) 
0 0 
0 0 
111 wood duck est. Not estimated 
17 merganser est. insufficient 
evidence 
? 30k 2 
2 ek 9 30% 
a a 
* Abnormal success in 1952 was caused by flooding of other nesting cavities and subsequent large 
scale dump nesting in these nesting boxes raisedup above flood crest; the success does not 
indicate production trend. 
** Student observer not available on full time basis and consequently data not available. 
9E2 

