The number of water areas remaining on the study area during 1953 breeding 
season was as follows: 
Table I. - Change in Number of Water Areas during the 1953 Breeding Season 

May June July August 
11-13 1-4 11-17 2-6 
Total number of areas 306 306 306 306 
Number of areas containing water 306 306 276 214 
Percent of areas containing water 100 100 90 70 
Total number of open areas * with water 154 154 150 126 
Percent of open areas still containing water 100 100 97 82 
Total number of wooded areas * with water 152 152 126 88 
Percent of areas still containing water 100 100 73 53 
*Wooded water areas are those areas which have two-thirds or more of 
the shoreline bordered by willows or aspen trees. Most of the wooded 
areas have close to 100 percent of the shoreline in willow or aspen, 
For the most part the shoreline on the open areas contain little or no 
brush, 
The Breeding Population 
Two censuses of breeding pairs were taken. The first was made on May 11, 
12 and 13, and the second on June 1, 2, 3 and 4. Results are as follows: 
Table II. - Breeding Pair Census -- Redvers Study Area 

Total Pairs * Estimated 
Males Pairs Males plus Pairs Population 
Species May June May June May June Total Pairs 
Mallard 151 129 107 77 258 206 258 
B-w. teal 4 74 88 76 92 150 150 
Pintail 31 38 24 14 55 52 55 
Baldpate 1 6 25 25 26 31 31 
G-w. teal 1 18 19 * 16 20 34 34 
Canvasback 12 14 12 9 24 23 24 
Shoveler 1 6 12 7 13 13 13 
Scaup 0 1 12 8 12 9 12 
Gadwall 0 0 2 6 2 6 6 
Redhead 0 l 2 3 2 4 4 
Ring-necked duck 0 0 4 1 4 1 4 
Ruddy duck 0 0 1 0 1 0 1 
Total 201 287 308 242 509 529 592 
* Estimated total population was arrived at by adding the total number of 
pairs of mallards, pintail, Canvasback, scaup and ring-necked ducks 
from the May census to total pairs of all the other species from the June 
census. This calculation was necessary because not all of the late 
migrating species had arrived at the time of the May census while by 
June 1 some of the mallards and pintail ducks had apparently left the area 
enroute to moulting areas. 
* 
