In winter, Youngs Island is an important resting stop for migrating waterfowl, particularly several species of special interest, including
American black duck, lesser and greater scaup, mallard, canvasback, Canada goose, long-tailed duck, bufflehead, common goldeneye, American wigeon, and red-breasted merganser.
The mean [T.sub.max] for the cattle egret (3.2 hours, 20 mg/kg) was much shorter than that for the helmeted guineafowl (Numida meleagris; 19.3 hours, 10 mg/kg), (12) the American flamingo (27 hours, 10 mg/kg), (10) and the
American black duck (24 hours, 10 mg/kg).
Meanwhile, PC2013 had significantly higher percent compositions of Anas rubripes (Brewster) (
American Black Duck; PC2001 = 1.30%, PC2013 = 12.50%, [G.sub.1] = 10.5, P < 0.005), Mallard (PC2001 = 6.72%, PC2013 = 27.0%, [G.sub.1] = 13.1, P < 0.001), and Wood Duck (PC2001 = 1.60%, PC2013 = 38.50%, [G.sub.1] = 42.1, P < 0.001).
The geographic ranges of the
American Black Duck and Mallard overlap extensively.
FAA should improve control of birds and wildlife near airports The victims could fill a novice bird-watcher's bucket list: blackpoll warbler, double-crested cormorant,
American black duck, short-billed dowitcher, black-crowned night heron, magnolia warbler, budgerigar and green-winged teal.
With much open water, waterfowl were plentiful: greater white-fronted goose, 1; pink-footed goose, 1 (new species for the count); snow goose, 1; Canada goose, 2,440; mute swan, 14; wood duck CW (seen during count week but not on count day); gadwall cw; American wigeon, 1;
American black duck, 55; mallard, 786; northern pintail, 1; green-winged teal, 9; ring-necked duck, 28; greater scaup, 58; lesser scaup, 12 (new high); white-winged scoter, 1; bufflehead, 10; common goldeneye, 106; Barrow's goldeneye, 1; hooded merganser, 355 (new high); common merganser, 96; American coot, 2; wild turkey, 226 (new high); common loon, 9; horned grebe, 4.
Alan Davies, former site manager of the Conwy RSPB reserve, spotted the
American black duck yesterday.
The valley provides nesting and migrating habitat for a number of waterfowl species--mallard,
American black duck, wood duck, green-winged teal, northern pintail and Canada goose.
sampled Mallard ([dagger]) Anas platyrhynchos 2,600
American black duck ([dagger]) A.
In some instances, such as the mallard (Anas platyrhynchos) x
American black duck (Anas rubripes) complex, hybridization leads to fertile offspring (Johnsgard, 1967; Kirby et al., 2004; Mank et al., 2004); however, pairings between common and king eiders appear to produce sterile offspring (Pettingill, 1959, 1962; Goudie et al., 2000).
-A RARE
American black duck has adapted so well to its new home in Devon that it has started emerging to eat bread thrown out for local tame mallards!
Anas rubripes - a dusky duck of northeastern United States and Canada