CENTRAL FLYWAY 
COLORADO = Continued 
Table 2. Comparison of Colorado Goose Breeding Ground Surveys = 1956-1958 
SaaS Be a ee a 
Total Observed Breeding Pairs 
1956 1957 1958 


Nesting Total Nesting Total Nesting Total 
Ares Pairs Young Birds Pairs Young Birds Pairs Young Birds 
Yampa 
River 12 36 78 12 13 55 a le 42 90 
Green 
River h. 17 27 4 16 38 5 64 76 
SSS —— 
TOTAL 16 53 105 16 29 93 16 1.06 166 
gE ee ed 
Species composition of the breeding duck population was quite 
similar to past years (Table 3). Mallards made up the bulk cf the breeding 
birds (56.6%) and pintails (15.7%) were the only other species to exceed 
10 percent of the total number of ducks. Shovelers also showed 93 marked 
increase, due probably to the abundance of shallow water areas this year. 
Table 3. Species Composition of the Colorado Breeding Population 1958, 
1957 and 4-Year Average 
Species Composition 
Number of Ducks Percent 
Rn~Year 1957 1958 1957 1958 
Species Average Average 
Mallard 10,475 9,944 10,030 64.3 61.2 56.6 
Blue-winged Teal 926 1,208 651 5.6 FT olt Ber 
Pintail 836 1,023 2,800 502 663 L507 
Gadwall 1,343 1,150 1,270 8.3 Fel, 7.2 
Baldpate ; 354 276 LO Zol wey 0.8 
Shoveler 381 875. «1,181: 2 otf 203 605 
Cinnamon Teal 594. 562 418 206 365 2 ok 
Green-winged Teal 429 682 260 2e7 2 225 
Redhead 502 739 544 3.0 eS QoL 
Scaup 306 201 294, Thea 132 1.7 
Rudéy Duck 26 - 87 0.2 ~ 905 
Bufflehead 3 = _ Gel, c ms 
American Merganser 135 100 56 6.8 C06 Co3 
a a a 
TOTALS 16,307 16,260 17,731 100.0 100.9 100.0 
ee 
15 
