Brood size reduction between average successful clutch size and average total brood size | Brood size reduction between average successful clutch size and average Class Ib brood size | Brood size reduction between Class Ib brood and average total brood size | ||||||
Species | Average successful clutch size | 17-year average brood size | Number | Percent | Number | Percent | Number | Percent |
Dabbling ducks | ||||||||
Mallard | 9.2 | 5.8 | 3.4 | 37 | 2.3 | 25 | 1.1 | 16 |
Gadwall | 9.7 | 7.2 | 2.5 | 26 | 1.9 | 20 | 0.6 | 8 |
American wigeon | 8.6 | 6.6 | 2.0 | 23 | 1.8 | 21 | 0.2 | 3 |
Green-winged teal | 8.8 | 5.4 | 3.4 | 39 | 2.8 | 32 | 0.6 | 10 |
Blue-winged teal | 10.2 | 6.7 | 3.5 | 34 | 3.4 | 33 | 0.1 | 1 |
Northern shoveler | 9.9 | 5.6 | 4.3 | 43 | 3.5 | 35 | 0.8 | 13 |
Northern pintail | 7.8 | 4.4 | 3.4 | 44 | 0.3 | 4 | 3.1 | 41 |
Total dabbling ducks | 9.8 | 6.6 | 3.2 | 33 | 2.7 | 28 | 0.5 | 7 |
Diving ducks | ||||||||
Redhead | 10.0a | 6.2 | 3.8 | 38 | 3.3 | 33 | 0.5 | 7 |
Canvasback | 7.7a | 4.7 | 3.0 | 39 | 2.3 | 30 | 0.7 | 13 |
Lesser scaup | 9.9 | 7.5 | 2.4 | 24 | 3.1 | 31 | 1.3d | 19d |
Ring-necked duck | 9.2b | 6.8 | 2.4 | 26 | 5.2 | 57 | 2.8d | 70d |
Ruddy duck | 6.6a | 4.7 | 1.9 | 29 | 1.9 | 29 | 0.0 | 0 |
Total diving ducks | 8.7c | 5.6 | 3.1 | 36 | 3.1 | 36 | 0.0 | 0 |
Total broods | 9.0c | 6.4 | 2.6 | 29 | 2.2 | 24 | 0.4 | 4 |