124 
Table I - Hatching Success and Brood. Survival 




Class I Class II Class III 
Species No. Dkls. / No. Dkls. / No. Dkls. / Remarks 
Broods Brood Broods Brood Broods Brood 
Blacks 
Av. (45-52) 17.2 7.7 11.4 6.2 15.8 6.6 
1952 8 8.0 12 7.7 17 7.6 
B-w. teal 
Av. (45-52) 1.6 6,2 2.9 6.2 4.6# 7.1# # 7 years only 
1952 4 6.0 3 t,t 5 8.2 
G-w. teal 
ASS # 6 years only 
Av. (45-52) 2.34 7.44 2.6° 6.6° 4.2@ 5.9@ ° 7 years only 
1952 - - 3 8.7 4 5.8 @ 5 years only 
Wood duck 
Av. (45-52) 6.7# 6. 3#. 9.9 5.9 8.1 5.6 # 7 years only 
1952 3 8.7 12 6.5 6 5.8 
Ring-necked duck 
Av. (45-52) 19.4 6.9 15.6 6.5 7.2# 5, 6# # 6 years only 
1952 11 8.2 16 6.4 1 4,0 
Goldeneye 
Av. (45-52) 22.7# 6.1# 9.9 4.8 8.9 4.5 # 7 years only 
1952 18 6.7 15 5.8 12 4.2 
Breeding Population 
Species Composition — 
The black duck is still the most abundant breeding species on the study 
area and has increased greatly over last year. The population is at present the 
largest since this breeding ground survey was started in 1945. All the remaining 
breeding species except the two species of teal show an increase over last year. 
Table II - Species Composition of the Breeding Population 
Species Total Population 1952 ! Percent 
Black ducks 1,405 60.7 
Blue-winged teal 160 F 6.9 
Wood duck . 333 | 14, 3 
Ring-necked duck 210 9.1 
Green-winged teal 78 3.4 
American goldeneye 127 5.5 
Mallard 3 0.1 
Total 2,316 100.0 
