Gambecchio di Bonaparte

Identificazione

The white-rumped sandpiper is a relatively small bird measuring only 7.8 in (20 cm). The top of its body is a dull grey-brown color and it has a white eye stripe. Its beak is of medium length, thin and dark, and its legs are very dark. This bird is often mistaken with many similar-looking sandpipers that live in its range or along its migration path.<p>The plumage is much less distinct during the winter; however, during all seasons males and females remain similar in their appearance. In adult alternate plumage, the crown and face have a brownish tinge. The supercilium is pale, there are black feathers on the back and there are grey edges on the wing coverts. The breast and flanks are streaked and the underparts are white. In adult basic plumage, the upperparts are a dark grey and at the centers there are black feathers. The underparts are white but the breast is dark grey. The supercilium is white, while the crown and eyeline are darker. The juvenile plumage features black-based feathers on the back and wing coverts. These have brown edges towards the scapulars and whiter edges towards the wing coverts. The breast is finely streaked and there is a white "V" on its back. The underparts and supercilium are white, the crown is brownish in color, and the face is pale<p>The two primary features used to identify this bird in the field are its long wings and its white rump. The white patch on the rump can be seen while the bird is in flight. Its long wings extend beyond the tail by about a quarter inch. Baird's sandpiper also shows this trait but can be distinguished by the lack of a white rump. There is also a thin white stripe on the wing and a row of marks on the flanks below the wings.

Tassonomia

The white-rumped sandpiper is placed in the order Charadriiformes along with gulls, alcids, plovers and oystercatchers. Its family, Scolopacidae, encompasses all sandpipers, and as a stint it is classified in the genus Calidris. It is classified as monotypic species, meaning that no population differentiation or subspecies have been described.<p>The genus name is from Ancient Greek kalidris or skalidris, a term used by Aristotle for some grey-coloured waterside birds. The specific fuscicollis is from Latin fuscus, "dusky" and Neo-Latin collis, "necked ".

Nome scientifico

Calidris fuscicollis

Autorità

(Vieillot, 1819)

Ordine

Caradriformi

Famiglia

Scolopacidi

Genere

Calidris

Areale e habitat

The white-rumped sandpiper inhabits relatively vegetated patches of the tundra. More specifically, they live in the marshy, heavily vegetated, hummocky arctic tundra of Alaska and Canada during the breeding season. They can be found in various types of wetlands while migrating. During the winter months they inhabit a variety of freshwater and saltwater habitats such as lagoons, estuaries and marshes. In general, they tend to avoid sandy beaches and fast moving water.<p>They are a long-distance migrant, wintering in southern South America and the Caribbean. They are considered one of the most extreme long-distance migrants in the world, traversing the entire continent of North America in the span of one month.<p>The white-rumped sandpiper is a nearctic migrant. After breeding in northern Canada and Alaska, it flies over the Atlantic Ocean to spend the majority of its non-breeding period in South America, particularly along the Patagonian coast in both Chile and Argentina. It also frequently visits Fracasso Beach, Argentina. Many shorebirds concentrate in this area due to the abundance of intertidal invertebrates, especially clams. The white-rumped sandpiper has also been spotted in Venezuela, Suriname, Brazil and Paraguay during its migration. They are rare but regular vagrants to western Europe and a rare vagrant to Australia.<p>The birds migrate with both nonstop and short-distance multiple-stop flights. During their migration from north to south, they fly over the Atlantic Ocean, gradually moving along the northeastern coast of South America before heading inland towards the islands. This travel generally takes about one month. On their migration from south to north, the white-rumped sandpiper follows a similar path, but does it much more quickly. This migration is done in a fast series of long flights without stopping. One nonstop flight can be as long as 4,200 km (2,600 mi).<p>Weather patterns play a crucial role in determining the migration route. Birds like to travel so that the temperature, pressure and humidity work with the tailwinds. Strong winds can blow birds off of their regular migration route. For example, the effects of a large storm lead to a higher presence of the white-rumped sandpiper on the King George Islands.<p>The warming of the climate has led to changes in the number of individuals and the length of their stay in the South Shetland Islands. White-rumped sandpipers are now observed more frequently in this area as a result of both long and short term climate variations. The higher air temperatures, which occur as a result of the northern winds, bring warm, moist air which creates more open habitats and better food resources that allow these birds to persist and survive. Migration routes, as well as both winter and summer foraging grounds, may also be altered.

Areale riproduttivo

NA : high to low Arctic wet tundra of far n Nearctic: North Slope Alaska, coastal n Canada to nw Hudson Bay, and Banks to Devon and Baffin is. (ne Canada)

Areale non riproduttivo

coastal and inland wetlands of temperate s South America: s Chile, se Brazil, nw to se Argentina, and Falkland Is.

Migrazione

Migratori completi

Comportamento

Comportamento migratorio: Migratori completi.

Conservazione

Tendenza della popolazione: in diminuzione.

Tendenza della popolazione

in diminuzione