877 
Table V. - Aerial Census of Waterfowl Production - Laurentian and Champlain Strata 
Size in Size in Size of Size of 
Sq. Mi. L. Mi. Sample Sample Ducks Observed Ducks Observed Production 
_ Type Year * eK Sq. Mi. L. Mi. in Sample /sq. or L. Mi. Index 
(1) (2) Broods Pairs Broods Pairs Broods Pairs 
LAURENTIAN | 
STRATUM 
Rivers 1951 - 75.2 - 18,4 0 1 0 0.05 0 38 
1952 (3) - 75.2 18.4 0 0 0 0 0 0 
1953 (no Laurential stratum) ----------------------- fee ee nn nn en nn ee en ee nee eee 
CHAMPLAIN 
STRATUM 
Marshes 1951 (no Champlain stratum) --~------------- n-ne cr nnn nr nr nnn nner rrr rn rcs cnr rcccss “— 
1952 ("' " i ) pee nn nn ee nn nn ne nn nn rn nnn nr rrr nn cern nner nace 
1953 2.8 - 0.6 “ 0 6 0 10.00 0 28 
ere a a st eee 
* Includes only transects, swamps and marshes. 
** Includes only shoreline of all major lakes and rivers. 
(1) Includes only random samples of transect area, swamps and marshes to give 
+ 30 percent error. “ 
(2) Includes only random samples of shoreline of major lakes and river to give 
+ 20 percent error for rivers; recommended minimum for lakes. 
(3) Figures for the July 2 to 14 flights only; also flown in 1952 on July 22-28. 
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