In the traditional survey area, which includes strata 1–18, 20–50, and 75–77 (Figure 1), the total duck population estimate (excluding scoters [Melanitta spp.], eiders [Somateria spp. and Polysticta stelleri], long-tailed ducks [Clangula hyemalis], mergansers [Mergus spp. and Lophodytes cucullatus], and wood ducks [Aix sponsa]) was 49.2 ± 0.8 [SE] million birds (Figure 3, Appendix A).
This represents an 8% increase over last year’s estimate of 45.6 ± 0.7 million, and is 43% higher than the long-term averagea (1955–2013;
Table 1).
Estimated mallard (Anas platyrhynchos) abundance was 10.9 ± 0.3 million, which was similar to the 2013 estimate, and 42% above the long-term average of 7.7 ± 0.04 million (Table 2).
Estimated abundance of gadwall (A. strepera; 3.8 ± 0.2 million) was similar to the 2013 estimate and 102% above the long-term
average (1.9 ± 0.02 million; Table 3).
The estimate for American wigeon (A. americana; 3.1 ± 0.2 million) was 18% above the 2013 estimate of 2.6 ± 0.2 million and 20% above the long-term average of 2.6 ± 0.02 million
(Table 4).
The estimated abundance of green-winged teal (A. crecca) was 3.4 ± 0.2 million, which was similar to the 2013 estimate and 69% above the long-term average (2.0 ± 0.02 million; Table 5).
The estimate forblue-winged teal (A. discors; 8.5 ± 0.5 million) was similar to the 2013 estimate and 75% above the long-term
average of 4.9 ± 0.04 million (Table 6).
Estimates of northern shovelers (A. clypeata; 5.3 ± 0.3 million) and northern pintails (A. acuta; 3.2 ± 0.2 million) were similar to the 2013 estimates and were 114% above and 20% below their long-term averages of 2.5 ± 0.02 million (Table 7) and 4.0 ± 0.04 million (Table 8),respectively.
Abundance estimates for redheads (Aythya americana; 1.3 ± 0.1 million) and canvasbacks
(Aythya valisineria; 0.7 ± 0.05 million) were similar to their 2013 estimates and were 85% and 18% above their long-term averages of 0.7 ± 0.01 million (Table 9) and 0.6 ± 0.01 million (Table 10), respectively.
Estimated abundance of scaup (A. affinis and A. marila combined; 4.6 ± 0.3 million) was similar to the 2013 estimateand similar to the long-term average of 5.0 ± 0.05 million (Table 11).