Piovanello maggiore

Tassonomia

Nome scientifico

Calidris tenuirostris

Autorità

(Horsfield, 1821)

Ordine

Caradriformi

Famiglia

Scolopacidi

Genere

Calidris

Areale e habitat

Their breeding habitat is tundra in northeast Siberia, Russia. They nest on the ground laying about four eggs in a ground scrape. They are strongly migratory wintering on coasts in southern Asia through to Australia. This species forms enormous flocks in winter. <p>The species is also recorded in low numbers in western Alaska, United States, most years, and has occurred as a vagrant in British Columbia, Canada, and in Oregon, West Virginia, and Maine, in the U.S.

Areale riproduttivo

PAL : low Arctic and subarctic montane tundra: ne Siberia from Yakutsk e to Anadyr Pen.

Areale non riproduttivo

OR, AU : coastal Australasia: ne Arabian Pen., coastal s, se Asia, Indonesian Arch., Taiwan, se China, Philippines, nw, s New Guinea, Australia including Tasmania

Migrazione

Complete migrants

Comportamento

These birds forage on mudflats and beaches, probing or picking up food by sight. They mainly eat molluscs and insects.

Conservazione

The great knot is one of the species to which the Agreement on the Conservation of African-Eurasian Migratory Waterbirds (AEWA) applies.<p>Since 5 May 2016 and as of August 2023[update], the great knot is listed as critically endangered in Australia under the federal Environment Protection and Biodiversity Conservation Act 1999 (EPBC Act), with the next assessment due on 30 October 2023.[2] A study published in Biological Conservation in March 2023 listed 23 species which the authors considered to no longer meet the criteria as threatened species under the EPBC Act, including the great knot. The reason for the assessment was "Populations now stable or declining at a rate less than threshold".[7][8]<p>Under state and territory legislation, the species is as of August 2023[update] listed as vulnerable in New South Wales and the Northern Territory; endangered in South Australia; and critically endangered in Queensland, Victoria, and Western Australia.[2]

Tendenza della popolazione

declining