Owen and Dix (1986) reported that wintering duck species exhibited a male-skewed sex ratio, particularly the common pochard Aythya
ferina (29.5% female, n = 24,173) and northern shoveler Anas clypeata (39% females, n = 136).
(13) Mallard ducks (Anas platyrhynchos) and the canvasback duck (Aythya
valisineria) had higher leucocyte counts during the summer than during the winter.
In 2005-06 and 2016-17, tufted duck (Aythya
fuligula) was the most frequent duck species detected positive (5% of all wild birds).
Eagle prey species include: (1) dabbling ducks: American Wigeon (Anas americana), Mallard (Anas platyrhynchos), Northern Pintail (Anas acuta), and Green-winged Teal (Anas crecca); (2) diving ducks: Scaup (Aythya
marila and A.
The biggest group was composed of tufted ducks (Aythya
fuligula) at 2,692 individuals, followed by garganeys at 832 individuals and whiskered terns (Chlidonias hybrida) at 806.
common pochard Aythya
ferina, northern shoveler Spatula clypeata, Eurasian wigeon Mareca penelope, northern pintail Anas acuta; Nagy et al.
The Ferruginous Duck Aythya
nyroca (Guldenstadt, 1770) is a winter visitor and a breeding resident in Morocco [1, 2]; it winters regularly in the Northern part of the country, usually in small numbers, in comparison with Tropical Africa .
clypeata y Aythya
affinis) durante las temporadas de caza noviembre 2012-febrero 2013 y noviembre 2013-febrero 2014 en la presa de Atlanatepec (N 19[grados] 33.596' y O 098[grados] 11.368'), ubicada en el estado de Tlaxcala, Mexico.
The other species that was studied was lesser scaup (Aythya
affinis), known to form seasonal pair bonds and with relatively smaller penises.
Redhead Ay thy a americana Ring-necked Duck Aythya
collaris Canvasback Aythya
valisineria Lesser Scaup Aythya
afpnis Bufflehead Bucephala albeola Ruddy Duck Oxyura jamaicensis Eared Grebe Podiceps nigricollis Clark's Grebe Aechmophorus clarkii Double-crested Cormorant Phalacrocorax auritus American White Pelican Pelecanus erythrarhynchos Great Blue Heron Ardea herodias Cattle Egret Bubulcus ibis White-faced Ibis Plegadis chihi American Coot Fulica americana Sandhill Crane Grus canadensis Killdeer Charadrius vociferans Semipalmated Plover Charadrius semipalmatus Black-necked Stilt Himantopus mexicanus American Avocet Recurvirostra americana Solitary Sandpiper Tringa solitaria Spotted Sandpiper Actitis mandarins Long-billed Curlew Numenius americanus Generic sandpiper Calidris sp.
Species of global conservation concern that either breed or winter in Cyprus include the Eurasian Curlew Numenius arquata, the Common Pochard Aythya
ferina and the Ferruginous Duck Aythya
nyroca, the latter of which breeds at the newly restored Akrotiri Marsh.
islandica Canvasback Aythya
1210 787 valisineria Scaup (unidentified) * 943 613 Greater Scaup Aythya
943 613 marila Lesser Scaup A.