Hooded dotterel

The hooded dotterel or hooded plover[1] (Thinornis cucullatus) is a species of bird in the family Charadriidae. It is endemic to southern Australia, where it inhabits ocean beaches and subcoastal lagoons. There are two recognised subspecies which form isolated eastern and western populations. The eastern subspecies is of greater conservation concern, with listings varying from Vulnerable in South Australia and Victoria to Critically Endangered in New South Wales.

Hooded dotterel
At Prosser River Spit, Orford, Tasmania, Australia
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Class: Aves
Order: Charadriiformes
Family: Charadriidae
Genus: Thinornis
Species:
T. cucullatus
Binomial name
Thinornis cucullatus
(Vieillot, 1818)
Synonyms[2]

Charadrius rubricollis Gmelin, 1789
Charadrius cuculatus
Thinornis rubricollis

Taxonomy

The hooded dotterel was placed in genus Charadrius but in the early 2000s it was reclassified into the genus Thinornis, along with shore plover (Thinornis novaeseelandiae).[3][4] In 2000 the number of mature individuals was estimated at 7,000.[3] Alternative common names include: hooded plover, hoody, pluvier à camail (in French), kappenregenpfeifer (in German), and chorlito encapuchado (in Spanish).[4]

Subspecies

Two subspecies of the hooded dotterel are now recognised.[3]

Description
A breeding pair

The hooded dotterel is medium in size for a plover, stocky, and pale in colour. Its length is 190 to 230 mm (7.5–9.1 in) and its wing-span 230 to 440 mm (9.1–17.3 in). It has a black hood and throat with a white collar. Its red bill has a black tip. It has a red eye ring and orange legs.[10] Underparts are white. Males and females are similar. Adults and juveniles are similar except the juveniles do not have the black head and hindneck, which are instead a sandy brown.[11]

Behaviour
Eggs

A clutch of 1–3 eggs is laid from August to March, which includes also the peak of the Austral summer tourist season in its range and it is thereby heavily impacted by human activities.[3][12] The eggs are a matte beige or cream colour heavily sprinkled with dark brown and lavender markings, especially at the larger end of the egg. Pyriform in shape, they measure 37 mm × 27 mm (1.46 in × 1.06 in).[13] Eggs hatch in about 30 days.[13] The eastern population eats a variety of invertebrates but little is known of the diet of the western population.[3][12] Specifically it eats insects, bivalves, and sandhoppers. It is usually seen in pairs or small groups near the water. For breeding it will dig a shallow scrape in sand or gravel above high-water mark and line it with pebbles, seaweed, and other debris.[11] Males and females spend equal amounts of time incubating the eggs, although males tend to incubate more at night.[14]

Threats

The population of hooded dotterels has declined in eastern Australia as a result of disturbance by people, dogs, cats and horses, as well as predation by silver gulls (Larus novaehollandiae), ravens (Corvus spp) and introduced foxes.[3][12] Fox predation is a major threat to the western subspecies.

Distribution and habitat

Its natural habitats are freshwater lakes, freshwater marshes, coastal saline lagoons, and sandy beaches. Heavy populations are found on beaches with seaweed and dunes. It is threatened by habitat loss because of its small population and limited native range. It is a non-migratory inhabitant of coastal and subcoastal Western Australia, South Australia, New South Wales, Victoria and Tasmania, and is a vagrant in Queensland.

Conservation
Conservation Status by Subspecies & Region
Subspecies AUS NSW VIC TAS SA WA
Thinornis cucullatus cucullatus Vulnerable[15] Critically endangered[16] Vulnerable[17] Conservation Concern[18] Vulnerable -
Thinornis cucullatus tregellasi Not listed[19] - - - - Not Listed[20]
Habitat range of Thinornis rubricollis

Important Bird Areas

BirdLife International has identified the following sites as being important for hooded dotterel conservation:[21]

See also

References
  1. BirdLife International (2012). "Thinornis rubricollis". IUCN Red List of Threatened Species. 2012. Retrieved 26 November 2013.
  2. "Thinornis cucullatus". Avibase.
  3. "Hooded Plover Thinornis rubricollis". BirdLife International. Retrieved 4 June 2011.
  4. "Hooded Plover (Charadrius rubricollis)". Internet Bird Collection. Retrieved 4 June 2011.
  5. "Taxon Summary – Hooded Plover (western)" (PDF). Department of Sustainability, Environment, Water, Population and Communities. Archived from the original (PDF) on 12 November 2011. Retrieved 4 June 2011.
  6. "Thinornis rubricollis rubricollis — Hooded Plover". Department of Sustainability, Environment, Water, Population and Communities. Retrieved 4 June 2011.
  7. "Thinornis rubricollis rubricollis — Hooded Plover (eastern)". Department of Sustainability, Environment, Water, Population and Communities. Retrieved 4 June 2011.
  8. Elson, Stephen J.; Marcus J. C. Singor (April 2008). "Hooded Plover Thinornis rubricollis tregellasi breeding data from Western Australia" (PDF). Journal for the East Asian – Australasian Flyway. Stilt. 53: 6–12.
  9. Singor, Marcus (April 2008). "Inland Movements of the Hooded Plover Thinornis Rubricollis Tregellasi in Western Australia" (PDF). Stilt. 55: 25–26. Archived from the original (PDF) on 2012-03-25.
  10. "Hooded Dotterel". Biodiversity Information Explorer. Retrieved 4 June 2011.
  11. "Hooded Plover". Birds in Backyards. Retrieved 4 June 2011.
  12. "Thinornis rubricollis". IUCN Red List. IUCN. Retrieved 4 June 2011.
  13. Beruldsen, Gordon (2003). Australian Birds: Their Nests and Eggs. Kenmore Hills, Qld: self. p. 221. ISBN 0-646-42798-9.
  14. Ryeland, Julia; Magrath, Michael J. L.; Weston, Michael A. (2021-12-28). "Day–night cycle influences the division of incubation in the Hooded Dotterel (Thinornis cucullatus)". Ibis. 164 (3): 785–792. doi:10.1111/ibi.13040. ISSN 0019-1019.
  15. Environment, jurisdiction=Commonwealth of Australia; corporateName=Department of the. "Thinornis cucullatus cucullatus — Hooded Plover (eastern), Eastern Hooded Plover". www.environment.gov.au. Retrieved 2020-06-25.{{cite web}}: CS1 maint: multiple names: authors list (link)
  16. "Hooded Plover - profile | NSW Environment, Energy and Science". www.environment.nsw.gov.au. Retrieved 2020-06-25.
  17. "Hooded Plover". www.swifft.net.au. Retrieved 2020-06-25.
  18. Bryant, Sally (2002). "Conservation assessment of beach nesting and migratory shorebirds in Tasmania" (PDF). Retrieved 2020-06-25.
  19. "Conservation Advice - Thinornis rubricollis tregellasi - hooded plover (western)" (PDF). Threatened Species Scientific Committee. 2014.
  20. Kennedy, Sharon (2015-09-02). "Little hooded plovers no match for dogs on South West beaches". ABC South West WA. Retrieved 2020-06-25.
  21. "Hooded Plover". Important Bird Areas. BirdLife International. 2012. Retrieved 2012-10-27.
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