2008 Population Estimates

In the traditional survey area, which includes strata 1-18, 20-50, and 75-77, the total duck population estimate (excluding scoters [Melanitta spp.], eiders [Somateria and Polysticta spp.], long-tailed ducks [Clangulahyemalis], mergansers [Mergus and Lophodytes spp.], and wood ducks [Aix sponsa]) was 37.3 million birds. This estimate represents a 9% decline over last year’s estimate of 41.2 million birds, but remains 11% above the 1955-2007 long-term average.

Canvasback Population Estimates

Canvasback Population Estimates

Estimates of canvasbacks (A. valisineria; 0.5 million) were 44% below the 2007 estimate (0.9 million) and 14% below the long-term average.

Redhead Population Estimates

Redhead Population Estimates

Estimated abundances of redheads (Aythya americana; 1.1 million) was similar to 2007 and was >50% above the long-term average.

Northern Shoveler Population Estimates

Northern Shoveler Population Estimates

Estimated abundances of Northern shovelers (A. clypeata; 3.5 million) was below 2007 estimates (-23%), but remains well above the long-term averages (+56%).

Scaup Population Estimates

Scaup Population Estimates

The scaup estimate (Aythya affinis and A. marila combined; 3.7 million) was similar to 2007, and remained 27% below the long-term average of 5.1 million.

Gadwall Population Estimates

Gadwall Population Estimates

Estimated abundances of gadwall (A. strepera; 2.7 million) was below 2007 estimates (-19%) but remains well above the long-term averages (+56%).

American Wigeon Population Estimates

American Wigeon Population Estimates

Estimated abundance of American wigeon (A. americana; 2.5 million) was 11% below the 2007 estimate of 2.8 million birds and 5% below the long term average.

Green-winged Teal Population Estimates

Green-winged Teal Population Estimates

Estimated abundance of green-winged teal (A. crecca; 3.0 million) was similar to 2007, and is >50% above the long-term average.

Blue-winged Teal Population Estimates

Blue-winged Teal Population Estimates

Blue-winged teal (A. discors) abundance was 6.6 million birds. This value is similar to the 2007 estimate of 6.7 million birds and 45% above the long-term average.

Northern Pintail Population Estimates

Northern Pintail Population Estimates

The estimate for Northern pintails (Anas acuta) was 2.6 million, which was 22% below the 2007 estimate of 3.3 million, and 36% below the long-term average.

Mallard Population Estimates

Mallard Population Estimates

Estimated mallard (Anas platyrhynchos) abundance was 7.7 million birds, which was similar to the 2007 estimate of 8.3 million birds and the long-term average.

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