12 
Table VIII. - Treeless Delta MacKenzie River, N. W. T. * 

1948 1949 1950 1951 1952 1953 
Ducks p:r Square mile 252 38.1 43.4 26.0 14,1 29.5 
Est. breeding pop. index 40,320 60,960 69,440 41,600 22,560 47,200 
% change from prev. years + 51 + 14 - 40 - 45 + 109 
Swans p2r Square mile 1.4 0.9 0.8 3.2 - 1,4 1.1 
Est. Breeding pop. index 2,240 1,440 1,280 5,120 2,240 1,760 
% change from prev. years - 36 - il + 300 - 56 - 21 
Canada geese per sq. mile . 03 03 .O1 07 L 2 37 
Est, breeding pop. index 48 48 16 112 1,920 592 
% change from prev. years - 67 + 600 +1,700 - 70 
W-F. geese per sq. mile . 06 . 04 02 0.3 0.5 02 
Est. breeding pop. index 96 64 32 480 800 32 
% change from prev. years - 33 - 50 +1, 400 + 66 - 96 
Percent Species Composition, 1953 
Species Percent Species Percent 
Pintail 55 Old squaw 4 
Scaup 12 Canvasback 3 
Baldpate 9 Shoveler 1 
Mallard 8 Merganser 1 
Scoter 7 
* Estimated area 1,600 square miles. 
Table IX. - Upland Tundra between MacKenzie and Anderson Rivers, N. W. T. * 
1948 1949 1950 1951 1952 1953 
Ducks per square mile 35.4 32.6 32.8 46.2 17.5 23,3 
Est. breeding pop. index 306,387 282,153 283,884 399,861 133,462 201,661 
% change from prev. year - 8 + 1 + 41 - 62.1 + 33 
Swans per square mile 1.2 1.0 1,0 2.8 277 9 
Est. breeding pop. index 10, 386 8,655 8,655 24,234 6,664 7,789 
% change from prev. year - 17 Ty ty + 180 - 725 17 
Canada geese per sq. mile oO te . 04 4 -- . 08 
Est. breeding pop. index 4,327 -- 346 3,462 -- 692 
% change from prev. year - 100 + inf. + 1,000 - 100 + inf, 
W-F. geese per square mile 1.9 «t 2.5 135 1.1 . 87 
Est. breeding pop. index 16, 444 6,058 21,637 12, 982 9,520 7,530 
% change from previous year - 63 + 257 - 40 - 28 - 2] 
Percent Species Composition, 1953 
Species Percent Species Percent 
Scoter 55 Merganser 3 
Scaup 20 Baldpate Z 
Old squaw 13 Mallard ] 
Pintail 6 
* Estimated area 8,655 square miles. 
