209 
Table 3. -- Comparison of Study Area Plots! Norther indiena ~-°1949 and 1950 
1949 Totals ' "" 1950 Totals” 
i Ducks Per "Bucks Per 
Area __ Date _Sq..Mi. Ducks Coot Sq. Mi. Ducks Coot Sq. Mi. Date - 
Es ic! i) dalek Ps a 
1s ae 4 23 = 5.7 25 12 6.3 5/18 
ase - 14 : 3.7 70 20 17.5 6/26 
- 33 : 8.2 29 15 7.3 r/tl 
2S 5/19 2 32 - 16.0 13 5 6.5 5/18: 
6/15 - 33 - 16,5 18 12 9.0 6/27 
7/26 - 24 - 12.0 17 20 8.5 7/11 
38 5/31 1 9 - 9.0 4 - 4.0 5/29 
7/7 - 0 - 0 2 zs 2.0 7/'6 
4S 6/1 1 1 - 1.0 2 - 2.0 5/15 
7/ 6 - “22 - 22.0 0 r 0 6/30 
6S 5/13 5 27 6 5.4 34 9 6.8 5/17 
6/28 - 71 13 14.2 57 3 11.4 6/20. 
7S 5/20 1 23 - 23.0 11 - 11.0 5/11: 
7/15 - 13 - 13,0 11 5 11.0 6/28 
8S 6/14 1 a oe 3.0 6 z 6.0 5/19 
7/25 = 0 - 0 0 = 0 6/27 
9S 6/ 2 1 5 - 5.0 0 0 5/15" 
7/ 6 - 8 » 8.0 14 - 14.0 6/30 
1 - 5S discontinued in 1950. 
2 - Includes young in broods (coot omitted). 
Species composition comparisons show decreases for the mallard, black 
duck, and wood duck. Blue-winged teal remained about the same, and coot exhibited : 
an increase (Table 4), Apparently the excess water in potholes during the 1950 
nesting season was a factor in holding nesting coot. The above mentioned 5 are the 
only species found to be nesting on study areas. 
On the basis of total pairs (calculated from pairs plus lone drakes), mallards 
decreased over 50 percent and blue-winged teal increased slightly (Table 5). It is 
thought, however, that the greater number of available water areas in 1950 might 
have dispersed loafing mallard drakes, Mallard broods observed on the areas 
numbered the same in 1949 and 1950. 
