44 
Table B-19. Colorado--Summary of duck breeding population estimates in selected 
areas, 1979. 
Total estimated breeding pairs Percent change 
Long-term From From long-term 
Area 1979 1978 average? 1978 average 
ee ng ie ee 
San Luis Valley 17,140 28,524 27,900 -40 -39 
North Park? 16,882 9,633 16,435 +75 + 2 
South Platte Valley 9,794 19,182 75313 -49 +34 
Cache la Poudre 
Valley 5,018 12,674 4,054 -60 +24 
Yampa Valley ] ,897 1,708 2,686 +]] -29 
Brown's Park 953 805 1,126 +18 -15 
Total 51,624 72,526 59,514 -29 -13 
Asan Luis Valley and North Park averages are based on results of 1964 through 
1975 and 1968 through 1978 surveys, respectively, because of changes in survey 
methods utilized prior to those dates. Figures for other areas are 23-year 
averages. 
Daerial counts corrected by species from visibility ratios obtained in the 
San Luis Valley. 
