Great knot

Last updated

Great knot
Calidris tenuirostris - Laem Phak Bia.jpg
Nonbreeding
Calidris tenuirostris - Great Knot.jpg
Breeding
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Charadriiformes
Family: Scolopacidae
Genus: Calidris
Species:
C. tenuirostris
Binomial name
Calidris tenuirostris
(Horsfield, 1821)

The great knot (Calidris tenuirostris) is a small wader. It is the largest species of the genus Calidris . They are a migratory bird which breeds in Siberia, Russia, and flies to southern Asia and Australia in the northern winter.

Contents

Etymology

The genus name is from Ancient Greek kalidris or skalidris, a term used by Aristotle for some grey-coloured waterside birds. The specific tenuirostris is from Latin tenuis "slender" and rostrum "bill". [3]

Distribution

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.

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.

Taxonomy and description

Great knots at Lee Point, Darwin, Northern Territory, Australia Great Knot 2 - Lee Point.jpg
Great knots at Lee Point, Darwin, Northern Territory, Australia
Manly Marina, SE Queensland, Australia

Calidris tenuirostris, commonly known as the great knot, is the largest species of the genus Calidris (sandpiper), in the family Scolopacidae. Its sister species, the red knot, is the next largest. Adult great knots can measure 26 to 30 cm (10 to 12 in), with a wingspan of 56 to 66 cm (22 to 26 in), and weighing 115 to 261 g (4.1 to 9.2 oz). [4] [5] [6]

This species has short dark legs and a medium-length thin dark bill. Breeding adults have mottled greyish upper parts with some rufous feathering. The face, throat and breast are heavily spotted black, and there are also some streaks on the rear belly. In winter the plumage becomes uniformly pale grey above.

It is distinguished from the red knot by its breeding plumage, in which the latter has a distinctive red face, throat and breast. In other plumages, the great knot can be identified by its larger size, longer bill, deeper chest, and the more streaked upper parts.

Behaviour

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

Conservation status

The great knot is one of the species to which the Agreement on the Conservation of African-Eurasian Migratory Waterbirds (AEWA) applies.

Australia

Since 5 May 2016 and as of August 2023, 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]

Under state and territory legislation, the species is as of August 2023 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]

Related Research Articles

<span class="mw-page-title-main">Eurasian wigeon</span> Species of bird

The Eurasian wigeon or European wigeon, also known as the widgeon or the wigeon, is one of three species of wigeon in the dabbling duck genus Mareca. It is common and widespread within its Palearctic range.

<span class="mw-page-title-main">Red-breasted merganser</span> Species of bird

The red-breasted merganser is a duck species that is native to much of the Northern Hemisphere. The red breast that gives the species its common name is only displayed by males in breeding plumage. Individuals fly rapidly, and feed by diving from the surface to pursue aquatic animals underwater, using serrated bills to capture slippery fish. They migrate each year from breeding sites on lakes and rivers to their mostly coastal wintering areas, making them the only species in the genus Mergus to frequent saltwater. They form flocks outside of breeding season that are usually small but can reach 100 individuals. The worldwide population of this species is stable, though it is threatened in some areas by habitat loss and other factors.

<span class="mw-page-title-main">Common redshank</span> Species of bird

The common redshank or simply redshank is a Eurasian wader in the large family Scolopacidae.

<span class="mw-page-title-main">Sanderling</span> Species of bird

The sanderling is a small wading bird. The name derives from Old English sand-yrðling, "sand-ploughman". The genus name is from Ancient Greek kalidris or skalidris, a term used by Aristotle for some grey-coloured waterside birds. The specific, alba, is Latin for "white".

<span class="mw-page-title-main">Dunlin</span> Species of bird

The dunlin is a small wader, formerly sometimes separated with the other "stints" in the genus Erolia. The English name is a dialect form of "dunling", first recorded in 1531–1532. It derives from dun, "dull brown", with the suffix -ling, meaning a person or thing with the given quality.

<span class="mw-page-title-main">Common greenshank</span> Species of bird

The common greenshank is a wader in the large family Scolopacidae, the typical waders. The genus name Tringa is the Neo-Latin name given to the green sandpiper by Aldrovandus in 1599 based on Ancient Greek trungas, a thrush-sized, white-rumped, tail-bobbing wading bird mentioned by Aristotle. The specific nebularia is from Latin nebula "mist". Like the Norwegian Skoddefoll, this refers to the greenshank's damp marshy habitat.

<span class="mw-page-title-main">Little stint</span> Species of bird

The little stint is a very small wader. It breeds in arctic Europe and Asia, and is a long-distance migrant, wintering south to Africa and south Asia. It occasionally is a vagrant to North America and to Australia. The genus name is from Ancient Greek kalidris or skalidris, a term used by Aristotle for some grey-coloured waterside birds. The specific minuta is Latin for "small.

<span class="mw-page-title-main">Purple sandpiper</span> Species of bird

The purple sandpiper is a small shorebird in the sandpiper family Scolopacidae. This is a hardy sandpiper that breeds in the arctic and subarctic regions of Eurasia and North America and winters further south on the Atlantic coast.

<span class="mw-page-title-main">Red knot</span> Species of bird

The red knot or just knot is a medium-sized shorebird which breeds in tundra and the Arctic Cordillera in the far north of Canada, Europe, and Russia. It is a large member of the Calidris sandpipers, second only to the great knot. Six subspecies are recognised.

<span class="mw-page-title-main">Bar-tailed godwit</span> Species of bird

The bar-tailed godwit is a large and strongly migratory wader in the family Scolopacidae, which feeds on bristle-worms and shellfish on coastal mudflats and estuaries. It has distinctive red breeding plumage, long legs, and a long upturned bill. Bar-tailed godwits breed on Arctic coasts and tundra from Scandinavia to Alaska, and overwinter on coasts in temperate and tropical regions of Australia and New Zealand. The migration of the subspecies Limosa lapponica baueri across the Pacific Ocean from Alaska to New Zealand is the longest known non-stop flight of any bird, and also the longest journey without pausing to feed by any animal. The round-trip migration for this subspecies is over 29,000 km (18,020 mi).

<span class="mw-page-title-main">Red-necked stint</span> Species of bird

The red-necked stint is a small migratory wader. The genus name is from Ancient Greek kalidris or skalidris, a term used by Aristotle for some grey-coloured waterside birds. The specific ruficollis is from Latin rufus, "red" and collum, "neck".

<span class="mw-page-title-main">Temminck's stint</span> Species of bird

Temminck's stint is a small wader. This bird's common name and Latin binomial commemorate the Dutch naturalist Coenraad Jacob Temminck. The genus name is from Ancient Greek kalidris or skalidris, a term used by Aristotle for some grey-coloured waterside birds.

<span class="mw-page-title-main">Curlew sandpiper</span> Species of bird

The curlew sandpiper is a small wader that breeds on the tundra of Arctic Siberia.

<span class="mw-page-title-main">Broad-billed sandpiper</span> Species of bird

The broad-billed sandpiper is a small wading bird. The scientific name is from Latin. The specific name falcinella is from falx, falcis, "a sickle. Some research suggests that it should rather go into the genus Philomachus.

<span class="mw-page-title-main">Sharp-tailed sandpiper</span> Species of shorebird

The sharp-tailed sandpiper is a small-medium migratory wader or shorebird, found mostly in Siberia during the summer breeding period and Australia for wintering.

<i>Calidris</i> Genus of birds

Calidris is a genus of Arctic-breeding, strongly migratory wading birds in the family Scolopacidae. These birds form huge mixed flocks on coasts and estuaries in winter. Migratory shorebirds are shown to have decline in reproductive traits because of temporal changes of their breeding seasons(Weiser et al., 2018). They are the typical "sandpipers", small to medium-sized, long-winged and relatively short-billed.

<span class="mw-page-title-main">Grey-tailed tattler</span> Species of bird

The grey-tailed tattler, also known as the Siberian tattler or Polynesian tattler, is a small shorebird in the genus Tringa. The English name for the tattlers refers to their noisy call. The genus name Tringa is the Neo-Latin name given to the green sandpiper by Aldrovandus in 1599 based on Ancient Greek trungas, a thrush-sized, white-rumped, tail-bobbing wading bird mentioned by Aristotle. The specific brevipes is from Latin brevis, "short", and pes, "foot".

<span class="mw-page-title-main">Yellow-breasted bunting</span> Species of bird

The yellow-breasted bunting is a passerine bird in the bunting family Emberizidae that is found across the Boreal and East Palearctic. The genus name Emberiza is from Old German Embritz, a bunting. The specific aureola is Latin for "golden". The bird's call is a distinctive zick, and the song is a clear tru-tru, tri-tri.

<span class="mw-page-title-main">Surfbird</span> Species of bird

The surfbird is a small stocky wader in the family Scolopacidae. It was once considered to be allied to the turnstones, and placed in the monotypic genus Aphriza, but is now placed in the genus Calidris.

<span class="mw-page-title-main">Southern cassowary</span> Species of bird

The southern cassowary, also known as double-wattled cassowary, Australian cassowary, or two-wattled cassowary, is a large flightless black bird, found in Indonesia, Papua New Guinea, and northeastern Australia. It is one of the three living species of cassowary, alongside the dwarf cassowary and the northern cassowary. It is a ratite and therefore related to the emu, ostriches, rheas and kiwi.

References

  1. BirdLife International (2019). "Calidris tenuirostris". IUCN Red List of Threatened Species . 2019: e.T22693359A155482913. doi: 10.2305/IUCN.UK.2016-3.RLTS.T22693359A155482913.en . Retrieved 12 November 2021.
  2. 1 2 3 "Calidris tenuirostris — Great Knot". Species Profile and Threats Database . Department of Climate Change, Energy, the Environment and Water, Australian Government. 2023. Archived from the original on 23 August 2023. Retrieved 23 August 2023. CC-BY icon.svg Text may have been copied from this source, which is available under a Attribution 3.0 Australia (CC BY 3.0 AU) licence.
  3. Jobling, James A (2010). The Helm Dictionary of Scientific Bird Names. London: Christopher Helm. pp. 84, 381. ISBN   978-1-4081-2501-4.
  4. Jeyarajasingam, A. (2012). A field guide to the birds of Peninsular Malaysia and Singapore. Oxford University Press.
  5. Van Gils, J., P. Wiersma, G. M. Kirwan, and C. J. Sharpe (2020). Great Knot (Calidris tenuirostris), version 1.0. In Birds of the World (J. del Hoyo, A. Elliott, J. Sargatal, D. A. Christie, and E. de Juana, Editors). Cornell Lab of Ornithology, Ithaca, NY, USA.
  6. Dunning, John B. Jr., ed. (2008). CRC Handbook of Avian Body Masses (2nd ed.). CRC Press. ISBN   978-1-4200-6444-5.
  7. Woinarski, John C.Z.; Garnett, Stephen T.; et al. (2023). "Lights at the end of the tunnel: The incidence and characteristics of recovery for Australian threatened animals". Biological Conservation. Elsevier BV. 279: 109946. Bibcode:2023BCons.27909946W. doi: 10.1016/j.biocon.2023.109946 . ISSN   0006-3207.
  8. "Researchers find 26 Australian species recovered from the brink of extinction". ABC News. 24 February 2023. Retrieved 23 August 2023.