
149 

Table 1. -- Trends in Duck Densities on Ground Transects, 1949-1950 
Total Pairs Total Ducks 
County Per Sq. Mi. Per Sq. Mi. Percent Change 
Beadle 0.9 8. 3. 1.8 F722 ~~ 820. #- 850 | 
. Brookings 9.0 3.7 14,4 6.5 — 59 — 55 
Campbell 15.9 16.8 27.2 27.7 ~- 6 ~- 2 
Clark 10.5 12.0 25.0 25.1 # 14 0 
Codington 15.3 15.5 26.6 28.0 ~- 1 ~- 6 
Day 14.7 13.1 26.4 23.0 — 10 — 13 
Edmunds 41.2 49.4 56.6. 86.2 7x 20 x~ 52 
Faulk 13.2 32.3 20.4 53.8 #145 ~ 61 
Grant 18,3 25.6 36.5 40.0 #~ 40 # 10 
Hamlin 8.6 7.3 15.7 13.6 — 15 — 13 
Kingsbury 13.1 >. & 23.8 9.1 — 58 — 62 
Lake _ 4,5 8,3 8.2 12.8 = #& 85 # 54 
McCook 6.3 6.0 10,2 7.5 — 5 — 26 
Jerauld a 20.0 9.9 33.2 #~ 292 x 236 
Marshall 24.7 34.6 46.0 61.2 # 40 ~ 33 
McPherson 28.6 34.5 40.0 53.0 # 21 ~ 32 
Miner 4.4 4.1 8.6 6.6 — 7 — 23 
Moody 5.6 4.8 8.2 9.2 x 14 ~ 12 
Potter 25.6 12.9 38,4 21.8 — 50 — 43 
Roberts 54.6 60.8 108.8 104, 8 7 11 — 4 
Sanborn 5.4 20.4 10.9 30.8 #278 # 182 
Walworth 4.1 16.0 6.2 24.3 ~ e&290 #293 
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Totals 14,0 18.0 25.4 31.0 # 29 # 22 
. 
Footnote: 1 - Averages calculated from totals for all the transects 
and not averages of the individual transect averages. 
