IS 
Table 1 - Summary of Waterfowl Breeding Ground Trends in North Dakota - 1950-1955 

INDICES TO TOTAL BREEDING DUCKS 
Average Index Percent of Change of 1955 
- Inclusive Index From: 
Species 1950 to 1954 1954 Index 1955 Index Average 1954 
Mallard 195,593 152,542 159, 252 - 18.6 + 4.4 
Pintail 351,530 186, 788 192, 829 - 45.1 + 3.2 
B-w. Teal 466, 800 275, 666 361,314 - 22.6 + 31.1 
Gadwall . 84,018 73, 946 71,951 - 14.4 +“ 2E7 
Baldpate 30,434 27, 182 31,179 + 2.4 + 14.7 
Shoveler —s_ 129,535 © 73,410 98,573 - 23.9 + 34.3 
Redhead 40,311 42,919 48,447 + 20.2 + 12.9 
Canvasback 34, 344 15, 737 38,374 | + 11.7 +143. 8 
Scaup © : 41,257 — 25,126 167, 766% +306. 6* +567. 7# 
Ruddy 20, 160 12,697 19, 667 = 2.4 + 549 
Others 5,935 8,136. 9, 833 | + 65.7 + 20.9 
Peer ss TO, OU ree 8 ee ek, BEE ne i oA es et 
Total Ducks | 894,149 1,199,185 - 14.3 + 34,1 | 
Coot 1,009 518 703 - 30.3 + 35.7 
ee 
Index to Water Conditions: Equals number of water areas per 
sq.mi. x Sq.mi. in area sampled. 
Average Index Percent Change 1955 from: 
1950-1954 1954 Index 1955 Index Average 1954 
456,309 239,874 343,432 - 24.7 + 43.2 
* These indices are consiaered to bé an erroneous indication of actual size of Scaup population. 
AVMAT4A TVHINGAD 

