Table 1.--Characteristics of black duck counts from breeding population surveys in eastern Canada, 
1955-56 and 1963-64 
Frequency per segment 
Pairs 
Singles 
Groups of 3 
Groups of 5 or more 
Ducks per segment 
Southern Zone 
1955 
.306 (M)A' 
.245(M) 
■061(H) 
.000(M) 
1.04 
1956 
.307 (M) 
.224 (M) 
. 000 (M) 
.000(M) 
.96 
1963 
.259(M) 
.190(M) 
.000(M) 
.017 (M) 
.88 
1964 
.254(M) 
.460(H) 
,016(M) 
.016(M) 
1.21 
x + 2 S <E . 
.244-.348 
.160-.400 
.000-.048 
.000-.017 
Central Zone 
1955 
.275(M) 
.261(M) 
• 058(H) 
.101(H) 
2.13 
1956 
.754(H) 
.333(M) 
. 029 (M) 
. 02 9 (M) 
2.35 
1963 
.433(M) 
•300(M) 
.050(M) 
.067 (M) 
1.85 
1964 
.340 (M) 
.420(H) 
.020(L) 
.020 (M) 
1.54 
7 + 2 S.E. 
.236-.664 
.260-.396 
.021-.057 
.017-.091 
Northern Zone 
1955 
.247(M) 
.188(M) 
.059(M) 
. 024 (M) 
1.10 
1956 
. 141 (M) 
.070(L) 
.000(L) 
. 05 9 (M) 
0.99 
1963 
.330(H) 
.250(H) 
.034(M) 
.068(H) 
1.89 
_ 1964 
. 170(M) 
.182(M) 
.080(H) 
.Oil(L) 
0.99 
T + 2 S.E. 
.137-.307 
.097-.247 
.007-.079 
.013-.067 
—^Letters indicate classification as high, medium, or low with regard to the frequency of various 
group sizes in relation to the mean frequency for the area over the 4 years. 
