
The higher nesting success in 1955 as compared to 1954,for example, 
is attributed to a more nearly normal production of predator foods which took 
pressure off of duck nests especially after June l. 
Brood Production 
A brood census to determine production was taken on July 6 to 13 
and again on July 27 to August 1, These censuses were taken about a week 
earlier than 1953 and 1954 but a few days later than in 1952. Using three differ - 
ent methods of calculating brood production from the two censuses we came up 
with figures of 183, 192, and 193 respectively. As in 1954, the final brood 
count gave the highest production and seems to be the best indicator of total 
production. 
Total brood production in 1955 compared to previous years is 
illustrated in Table VI. 
Table VI. - Brood Population (Total Calculated Production). 
Percent Change 

1952 1953 1954 1955 In 1955 From "PAR" * 
Mallard 122 101 45 71 - 36% 
B-w. Teal 62 63 21 39 - 37% 
Pintail 19 20 5 8 - 58% 
Baldpate 12 18 6 14 - 7% 
G-w. Teal 14 6 4 3 - 67% 
Canvasback 9 19 7 26 + 86% 
L. Scaup 2 8 2 7 + 40% 
Shoveler 6 6 5 8 + 33% 
Gadwall 2 2 0 3 + 50% 
Ringneck 1 1 0 3 +Z200% 
Redhead 0 2 2 4 +100% 
Ruddy 0 0 0 7 - 
Total 249 246 97 193 - 22% 
Remaining 
Potential ** 14 17 16 12 
* Percent change from 1952-1953 average. These years the 
Redvers Area was considered to be at nearly maximum 
carrying capacity. 
** Remaining potential includes pairs, lone drakes and lone 
females on area. | 
