Table XI - Brood Data by Water Area Types 
Open Areas Wooded Areas 
Number of broods observed from July 25-29 128 55 
Acreage of water remaining on July 25 138.0 38.2 
Broods per acre 0.93 1,44 
Acreage of occupied water areas 92.3 21.3 
Broods per acre of occupied areas only 1.39 2.58 
The above data indicates a higher use of wooded areas (on a per-acre basis) 
than for open areas. Further analyzing the data by water areas and size-classes, 
it was found that there was not a decidedly higher use on the very small areas by 
broods (as was the case for breeding pairs) so that the heavier use of wooded areas 
was a real one. However, this may not necessarily have been due to a preference 
for wooded areas but to the fact that more of the wooded areas dried up due to their 
small, shallow nature thus causing a heavier concentration of broods on the 
remaining areas. It should be explained that the wooded and open areas were not 
evenly distributed over the study area but instead there would be two or three miles 
of predominantly wooded areas then a series of open areas. 
Aerial VS Ground Coverage 
Aerial censuses of breeding pairs were flown on May 11 by Hawkins and 
Perroux and on May 24 by Lynch and Hyska. In both instances a Piper Super Cub 
125 plane was used. The data compared to the ground count are as follows: 
Table XII - Aerial VS Ground Counts of Total Ducks - Redvers Study Area 
Ground Aerial Count by Aerial Count by Aerial Count by 
Count Observer Hawkins Pilot Lynch Observer Hyska 
Species No. of No. of Percent No. of Percent No. of Percent 
Ducks Ducks Seen Ducks Seen Ducks Seen 
Mallard 335 73 22 88 26 93 28 
B-w. teal 248 47 19 19 8 3 l 
Pintail 79 18 23 9 ll 9 ll 
Baldpate 60 18 30 13 22 5 § 
G-w. teal 50 3 6 - - 1 2 
Canvasback 37 38 103 14 38 26 70 
Lesser scaup 27 5 19 8 30 16 59 
Shoveler 23 5 22 6 26 3 13 
Gadwall 14 4 29 4 29 8 57 
Ringneck 8 zZ 25 2 z25 - - 
Redhead. 7 4 57 2 29 1 14. 
Ruddy duck 2 - - - - - - 
Unidentified - 42 - 90 - 144 i. 
re era eC Seal ke Se in) ee ee Be el DS er ey 
Total 809 259 29 255 29 - 309 35 
No. of Ponds 306 297 97 295 96 294 96 
