Tag: all of Anas

Estimation of carcass fat and protein in northern pintails ( Anas acuta) during spring migration

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 […]

Parasites of waterfowl from southwest texas: ii. the shoveler, Anas clypeata

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 […]

Long-term climatic trend and body size variation in teal Anas crecca

Green-winged Teal (Anas carolinensis) Science Article 3 abstract A general warming of climate in the future may profoundly affect wildlife populations in terms of numbers, distribution and characteristics of the individuals, therefore leading to new challenges in terms of management and conservation. The effects of global warming can already be detected through the analysis of […]

The displays of the American green-winged teal

Green-winged Teal (Anas carolinensis) Science Article 5 abstract The displays of the European race of the Green-winged Teal (Anas crecca crecca) have been studied intensively (Lorenz, 1953, 1958; Lorenz and von de Wall, 1960; von de Wall 1963) but no detailed description has been published for the North American race (A. c. carolinensis). McKinney, F, […]

Early breeding teal Anas crecca use the best lakes and have the highest reproductive success.

Green-winged Teal (Anas carolinensis) Science Article 1 abstract Teal (Anas crecca) broods were studied in 1988-2003 in a boreal watershed comprising 51 permanent wetlands. Brood size of near-fledged ducklings was negatively related to the hatching date, i.e. early pairs had higher reproductive success than late pairs. However, brood size of newly hatched ducklings was not […]

Spring migration dates of teal Anas crecca ringed in theCamargue, southern France

Green-winged Teal (Anas carolinensis) Science Article 4 abstract The policy of the European Commission prohibits hunting of migratory birds while they travel to their breeding grounds. To date, spring migration dates of ducks have mainly been determined using bird counts, but the validity of this sometimes disputed method has never been tested. We used ring-recovery […]

Wingbeat frequency and the body drag anomaly: wind-tunnel observations on a thrush nightingale (Luscinia luscinia) and a teal (Anas crecca)

Green-winged Teal (Anas carolinensis) Science Article 2 abstract A teal (Anas crecca) and a thrush nightingale (Luscinia luscinia) were trained to fly in the Lund wind tunnel for periods of up to 3 and 16 h respectively. Both birds flew in steady flapping flight, with such regularity that their wingbeat frequencies could be determined by […]

Fuelling rates of garganey ( Anas querquedula) stagingin the Camargue, southern France, during spring migration

Garganey (Anas querquedula) Science Article 1 abstract Most species of long-distance migratory birds put on energy stores to fuel their travels. However, recent studies have highlighted the potential costs associated with carrying too much fuel, either through increased predation risk or decreased .ight e.ciency. Consequently, it is now widely accepted that migratory birds should carry […]

Does choice of estimators influence conclusionsfrom true metabolizable energy feeding trials?

Blue-winged Teal (Anas discors) Science Article 1 abstract True metabolizable energy (TME) is a measure of avian dietary quality that accounts for metabolic fecal and endogenous urinary energy losses (EL) of non-dietary origin. The TME is calculated using a bird fed the test diet and an estimate of EL derived from another bird (Paired Bird […]