Red-necked phalarope

Red-necked phalarope
Breeding plumage
Winter plumage
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Charadriiformes
Family: Scolopacidae
Genus: Phalaropus
Species: P. lobatus
Binomial name
Phalaropus lobatus
(Linnaeus, 1758)
Range of P. lobatus      Breeding range     Wintering range

The red-necked phalarope (Phalaropus lobatus) is a small wader. This phalarope breeds in the Arctic regions of North America and Eurasia. It is migratory, and, unusually for a wader, winters at sea on tropical oceans.

Taxonomy

The red-necked phalarope was one of the many bird species originally described by Linnaeus in the landmark 1758 10th edition of his Systema Naturae, where it was given the binomial name of Tringa lobata.[2] It has also been known as the northern phalarope.[3]

Description

The red-necked phalarope is about 18 cm (7.1 in) in length, with lobed toes and a straight, fine bill. The breeding female is predominantly dark grey above, with a chestnut neck and upper breast, black face and white throat. They have a white wing stripe which helps distinguish this bird from the similar Wilson's phalarope. The breeding male is a duller version of the female. They have lobed toes to assist with their swimming. Young birds are grey and brown above, with buff underparts and a black patch through the eye. In winter, the plumage is essentially grey above and white below, but the black eyepatch is always present. They have a sharp call described as a whit or twit.

Standard Measurements[3][4]
length 170–200 mm (6.5–8 in)
weight 35 g (1.2 oz)
wingspan 380 mm (15 in)
wing 101–106.5 mm (3.98–4.19 in)
tail 45–51 mm (1.8–2.0 in)
culmen 20.2–23.5 mm (0.80–0.93 in)
tarsus 19.8–21.6 mm (0.78–0.85 in)

Ecology

Breeding

Eggs, Collection Museum Wiesbaden

The typical avian sex roles are reversed in the three phalarope species. Females are larger and more brightly coloured than males. The females pursue and fight over males, and will defend their mate from other females until the clutch is complete and the male begins incubation. The males perform all incubation and chick-rearing activities, while the females may attempt to find another mate. If a male loses his eggs to predation, he may re-pair with his original mate or a new female to try again. Once it becomes too late in the breeding season to start new nests, females begin their southward migration, leaving the males to incubate the eggs and look after the young.

Chick

The nest is a grass-lined depression at the top of a small mound. Clutch size is usually 4 splotchy olive-buff eggs, but can be fewer. Incubation is about 20 days.[3] The young mainly feed themselves and are able to fly within 20 days of hatch.

Feeding

When feeding, a red-necked phalarope will often swim in a small, rapid circle, forming a small whirlpool. This behaviour is thought to aid feeding by raising food from the bottom of shallow water. The bird will reach into the center of the vortex with its bill, plucking small insects or crustaceans caught up therein. On the open ocean, they are often found where converging currents produce upwellings. During migration, some flocks stop over on the open waters at the mouth of the Bay of Fundy to take advantage of food stirred up by tidal action.

Migration

Almost all of the nonbreeding season is spent in open water. As this species rarely comes into contact with humans, it can be unusually tame.

Status

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

Red-necked phalarope

In Britain and Ireland

The red-necked phalarope is a rare and localised breeding species in the Ireland and Britain, which lie on the extreme edge of its world range. The most reliable place for them is the Shetland Isles, particularly the Loch of Funzie on Fetlar, with a few birds breeding elsewhere in Scotland in the Outer Hebrides (e.g. at Loch na Muilne, where a "phalarope watchpoint" has been set up) and sometimes the Scottish Mainland in Ross-shire or Sutherland. They have also bred in western Ireland since about 1900, where the population reached a peak of about 50 pairs. There have been very few breeding records in Ireland since the 1970s, but breeding was reported from County Mayo in 2015, involving a male and three females.

The tracking of a tagged bird from Fetlar unexpectedly revealed that it wintered with a North American population in the tropical Pacific Ocean; it took a 16,000 mi (26,000 km) round trip across the Atlantic via Iceland and Greenland, then south down the Eastern seaboard of America, across the Caribbean and Mexico, before ending up off the coast of Ecuador and Peru. For this reason, it is suspected that the Shetland population could be an offshoot of a North American population rather than the geographically closer Scandinavian population that is believed to winter in the Arabian Sea.[5]

References

  1. ↑ BirdLife International (2012). "Phalaropus lobatus". IUCN Red List of Threatened Species. Version 2013.2. International Union for Conservation of Nature. Retrieved 26 November 2013.
  2. ↑ Linnaeus, Carl (1758). Systema Naturae per Regna Tria Naturae, Secundum Classes, Ordines, Genera, Species, cum Characteribus, Differentiis, Synonymis, Locis (in Latin). Vol. I (10th revised ed.). Holmiae: (Laurentii Salvii). p. 148 – via The Internet Archive.
  3. 1 2 3 Godfrey, W. Earl (1966). The Birds of Canada. Ottawa: National Museum of Canada. p. 169.
  4. ↑ Sibley, David Allen (2000). The Sibley Guide to Birds. New York: Knopf. p. 195. ISBN 0-679-45122-6.
  5. ↑ Smith, Malcolm; Bolton, Mark; Okill, David J.; Summers, Ron W.; Ellis, Pete; Liechti, Felix; Wilson, Jeremy D. (2014). "Geolocator tagging reveals Pacific migration of Red-necked Phalarope Phalaropus lobatus breeding in Scotland". Ibis 156 (4): 870–873. doi:10.1111/ibi.12196.
  • Hayman, Peter; Marchant, John; Prater, Tony (1986). Shorebirds: an identification guide to the waders of the world. Boston: Houghton Mifflin. ISBN 0-395-60237-8. 
  • Bull, John; Farrand, Jr., John (April 1984). The Audubon Society Field Guide to North American Birds, Eastern Region. New York: Alfred A. Knopf. ISBN 0-394-41405-5. 

Further reading

External links

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