Mallard (Anas platyrhynchos) Science Article 10 abstract Mallard (Anas platyrhynchos) breeding densities in the prairie pothole habitat of eastern North Dakota during 1961-1980 varied from 2.28 birds/km2 in 1977 to 9.47 birds/km2 in 1963 and were correlated with pond abundance (r = 0.543, P < 0.05). The number of basins used by pairs declined with […]

Pink-footed Goose (Anser brachyrhynchus) Science Article 7 abstract The conservation and management of wild goose populations requires an accurate estimate of productivity to be made each year, usually soon after the birds’ arrival in the wintering grounds. The best time to make the estimates is not always clear, however, since the measures used may vary […]

Pink-footed Goose (Anser brachyrhynchus) Science Article 7 abstract The conservation and management of wild goose populations requires an accurate estimate of productivity to be made each year, usually soon after the birds’ arrival in the wintering grounds. The best time to make the estimates is not always clear, however, since the measures used may vary […]

Northern Pintail (Anas acuta) Science Article 1 abstract Northern pintail duck semen and sperm traits were characterized, and the fertility of cold-stored spermatozoa was investigated using artificial insemination. Excellent qualityejaculates containing high proportions of motile spermatozoa were collected from drakes within 20 s by a massage technique. Semen was collected in Beltsville poultry semen extender, […]

Northern Pintail (Anas acuta) Science Article 2 abstract Foraging in stopover areas influences nutritional condition of birds during spring migration. Our purpose was to determine if body mass, percent carcass water, and serum biochemistry would predict energy reserves (carcass fat and protein) in northern pintails (Anas acuta) at a spring staging area, Lake St. Pierre […]

Northern Shoveler (Anas clypeata) Science Article 1 abstract Thirty-eight shoveler ducks, Anas clypeata, were collected in the Rio Grande Valley, Hudspeth County, Texas. Nineteen species of helminths, six species of lice and a sarcosporidian, Sancocystis nileyi, were recorded. Seventeen of the nineteen species of helminths were observed in fall migrants and twelve species were recorded […]

Light-bellied Brent Goose (Branta bernicla) Science Article 1 abstract The East Canadian High Arctic (ECHA) Light-bellied Brent Goose Branta bernicla hrota breedsin Canada’s eastern Queen Elizabeth Islands with the great majority wintering on the coastline of theisland of Ireland and smaller numbers on the Channel Islands and the northern coasts of France andSpain. It is […]

Lesser White-fronted Goose (Anser erythropus) Science Article 1 abstract Analyses of mitochondrial control region sequences were used to infer phylogeny of Anser species,phylogeography of the lesser white-fronted goose, and genetic background of a captive stock.The genetic distances among the Anser species ranged from 0.9 to 5.5% in the complete controlregion sequences and supported the view […]

Lesser White-fronted Goose (Anser erythropus) Science Article 2 abstract The Lesser White-fronted Goose has been afairly common breeding bird in the northern andmiddle parts of the Scandinavian mountain range.Since a few decades the species is threatened todisappear completely from Fenno-scandia (Norderhaug& Norderhaug 1984), where the populationin 1980 was estimated at 60-90 breeding pairsand 160-260 birds. […]

Hooded Merganser (Lophodytes cucullatus) Science Article 1 abstract The Hooded Merganser (Lophodytes cucullatus) is an uncommon migratory species (Robbinset al. 1983) that breeds from southeastern Alaska, south through Canada to northeasternand northwestern United States (AOU 1998). Octavio R. Rojas-Soto and Alejandro de Alba Bocanegra, ORNITOLOGIA NEOTROPICAL 13: 85-86, 2002 Download article download full text (pdf)