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Snow partridge

January 15, 2023

The snow partridge (Lerwa lerwa) is a gamebird in the pheasant family Phasianidae found widely distributed across the high-altitude Himalayan regions of India, Pakistan, Nepal and China. It is the only species within its genus, and is thought to be the most basal member of the "erectile clade" of the subfamily Phasianinae. The species is found in alpine pastures and open hillside above the treeline but not in as bare rocky terrain as the Himalayan snowcock and is not as wary as that species. Males and females look similar in plumage but males have a spur on their tarsus.

Snow partridge
Snow Partridge from Kedarnath Wildlife Sanctuary
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Galliformes
Family: Phasianidae
Subfamily: Phasianinae
Genus: Lerwa
Hodgson, 1837
Species:
L. lerwa
Binomial name
Lerwa lerwa
(Hodgson, 1833)[2]
Synonyms

Lerwa nivicola
Perdix lerwa protonym

Description

 
Head showing barring and curved beak

This partridge appears grey above and chestnut below with bright red bill and legs and the upperparts finely barred in black and white. In flight the pattern of dark brown primaries and secondaries with a narrow trailing white margin make them somewhat like the much larger Tibetan snowcock. The 14-feathered tail is dark and barred in white. There is variation in the shade and some birds have a nearly black crown.[3] The primaries and secondaries are brown and the breast is deep chestnut. The abdomen has more white and the lower flanks and feathers around the vent are barred brown and white. The under-tail coverts are chestnut with black shaft streaks and white tips. Young birds have the lower parts mottled and the barring less distinct. The tarsus is feathered on the front of the leg half-way to the toes.[4][5][6]

 
Illustration by John Gould

It measures 38–40 cm in length. Females weigh 450–580 g; males, 550–700 g. Sexes are similar in plumage, female lacks spurs on the tarsus while the male has a blunt spur and sometimes a second incipient spur. Downy chicks have a resemblance to the chicks of the blood pheasant.[7] Chicks are born with the tarsi feathered and the nostril opening is covered by feathers.[8]

Taxonomy and systematics

This species was first described by Brian Houghton Hodgson in 1833 and given the genus name Lerwa based on the Bhutia name for it in Nepal.[9][10] Hodgson initially placed it in the genus Perdix calling it Perdix lerwa.[11] A subspecies, L. l. major was described by Richard Meinertzhagen from Szechuan while L. l. callipygia from south Kansu was noted by Stegmann in 1938, but these are not usually recognized.[12][13][14] The species has been retained in this monotypic genus due to various peculiarities including the tarsus feathering and the lack of clear sexual dimorphism in plumage.[7] A species of bird louse, Chelopistes lervicola has been described as an ectoparasite of this species, and other species in this louse genus are known to parasitize the Cracidae, Meleagrididae and Odontophorinae of the New World.[15]

Distribution and status

Snow partridge is found in the Himalayas from Pakistan to Arunachal Pradesh along the higher ranges, mainly 3000 to 5000 m (rarely below 2000 m) altitude. It is found above the tree line but not on as bare and stony terrain as the snowcocks.[12] Although said to be found in Afghanistan, there is no evidence.[3] The species is found over a large area is generally considered to be of low conservation concern. It is hunted to some extent, due to its habit of being more approachable than snowcock and has declined in population in some areas.[7]

The usual habitat is alpine pastures, open grassy hillsides with grass, lichens, moss, ferns and rhododendrons. Is found among small snow-patches but not in as stony or bare ground as the snowcock. The birds however are very local in their distribution.[3][7][8]

Behaviour and ecology

 
Illustration from Hume and Marshall's Game birds of India (1890)

The snow partridge is found is small groups, usually about 6 to 8 but up to 30 during the non-breeding season. When flushed, they usually fly up before scattering away with noisy wing beats. The flight is rapid and stirring. It has a habit of sunning itself on rocks during the midday.[3] The call in the breeding season is said to resemble that of the grey francolin of the plains.[7] It has been compared in habit to that of the ptarmigan. It is said to feed on mosses, lichens, berries, and the shoots of plants. It also swallows grit to aid digestion.[10][16][17]

The breeding season is May to July. The males are believed to be monogynous. The nest is a scrape on a hill-side under some sheltering rock, either scratched out by themselves or already available, and usually hidden with vegetation.[10] The nest is sometimes lined with moss but well concealed although given away by the male. About 3 to 5 eggs, pale yellow in color and slightly glossy with reddish-brown markings on the rounded end,[10] are laid, and the female incubates while the male stands sentinel. Parent birds may use distraction displays to draw the attention of predators. They call in a comparatively softer lower note to the young, which respond with chicken-like cheep calls.[18][19][20][21]

Apart from Chelopistes lervicola described as an ectoparasite of this species, an Argasid tick Argas himalayensis has been noted.[22][23]

References

  1. ^ BirdLife International (2016). "Lerwa lerwa". IUCN Red List of Threatened Species. 2016: e.T22678649A92783114. doi:10.2305/IUCN.UK.2016-3.RLTS.T22678649A92783114.en. Retrieved 11 November 2021.
  2. ^ Hodgson, B.H. (1833). "Description of Perdix Lerwa". Proceedings of the Zoological Society of London: 107.
  3. ^ a b c d Rasmussen PC & JC Anderton (2005). Birds of South Asia: The Ripley Guide. Volume 2. Smithsonian Institution & Lynx Edicions. pp. 118–119.
  4. ^ Blanford, WT (1898). Fauna of British India. Birds. Vol. 4. Taylor and Francis, London. pp. 145–146.
  5. ^ Oates, EW (1898). A manual of the Game birds of India. Part 1. A J Combridge, Bombay. pp. 196–199.
  6. ^ Jerdon, TC (1864). The Birds of India. Volume 3. George Wyman & Co, London. pp. 555–557.
  7. ^ a b c d e Ali, S & S D Ripley (1980). Handbook of the birds of India and Pakistan. Vol. 2 (2nd ed.). Oxford University Press. pp. 6–8. ISBN 0-19-562063-1.
  8. ^ a b Potapov, R.L. (2000). "New information on the snow partridge Lerwa lerwa (Hodgson 1833) and its systematic position". Bulletin of the British Ornithologists' Club. 120 (2): 112–.
  9. ^ Hume, A.O. & C.H.T. Marshall (1879). The Game Birds of India, Burmah, and Ceylon. Volume 2. Calcutta, A.O. Hume and Marshall. pp. 1–7.
  10. ^ a b c d Rutgers, A. (1968). Birds of Asia. Taplinger Publishing Co., Inc. p. 5. ISBN 978-0800807702.
  11. ^ Hodgson, B.H. (1833). "Characters of a new species of Perdix (P. Lerwa)". Proceedings of the Zoological Society of London: 107.
  12. ^ a b Baker, ECS (1928). Fauna of British India. Birds. Volume 5 (2nd ed.). Taylor and Francis, London. pp. 432–435.
  13. ^ Meinertzhagen, R (1927). "Systematic Results of Birds collected at high altitudes in Ladak and Sikkim". Ibis. 69 (3): 571–633. doi:10.1111/j.1474-919X.1927.tb05372.x.
  14. ^ Marien, Daniel (1951). "Notes on some pheasants from southwestern Asia, with remarks on molt". American Museum Novitates (1518): 1–25. hdl:2246/3909.
  15. ^ Clay, T (1974). "Geographical distribution of the avian lice (Phthiraptera): a review". J. Bombay Nat. Hist. Soc. 71 (3): 536–547.
  16. ^ Jerdon, TC (1864). The Game birds and Wild fowl of India. Military Orphan Press. pp. 68–70.
  17. ^ Finn, Frank (1911). The game birds of India and Asia. Thacker, Spink & Co, Calcutta. pp. 91–92.
  18. ^ Finn, Frank (1915). Indian Sporting Birds. Francis Edwards, London. pp. 240–242.
  19. ^ Whymper, SL (1910). "Birds' nesting in Garhwal". J. Bombay Nat. Hist. Soc. 19 (4): 990–991.
  20. ^ Hume AO & CHT Marshall (1880). The Game birds of India, Burmah and Ceylon. Self published.
  21. ^ Hume, AO (1890). The nests and eggs of Indian Birds. Volume 3 (2nd ed.). R H Porter, London. p. 428.
  22. ^ Hoogstraal, H; Kaiser, MN (1973). "Observations on the Subgenus Argas (Ixodoidae: Argasidae, Argas). 7. A. (A.) himalayensis, New Species, Parasitizing the Snow Partridge, Lerwa lerwa, in Nepal". Annals of the Entomological Society of America. 66 (1): 1–3. doi:10.1093/aesa/66.1.1.
  23. ^ Clay, Theresa (1941). "A new genus and species of Mallophaga" (PDF). Parasitology. 33: 119–129. doi:10.1017/S0031182000024318.

External links

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January 15, 2023
snow, partridge, snow, partridge, lerwa, lerwa, gamebird, pheasant, family, phasianidae, found, widely, distributed, across, high, altitude, himalayan, regions, india, pakistan, nepal, china, only, species, within, genus, thought, most, basal, member, erectile. The snow partridge Lerwa lerwa is a gamebird in the pheasant family Phasianidae found widely distributed across the high altitude Himalayan regions of India Pakistan Nepal and China It is the only species within its genus and is thought to be the most basal member of the erectile clade of the subfamily Phasianinae The species is found in alpine pastures and open hillside above the treeline but not in as bare rocky terrain as the Himalayan snowcock and is not as wary as that species Males and females look similar in plumage but males have a spur on their tarsus Snow partridgeSnow Partridge from Kedarnath Wildlife SanctuaryConservation statusLeast Concern IUCN 3 1 1 Scientific classificationKingdom AnimaliaPhylum ChordataClass AvesOrder GalliformesFamily PhasianidaeSubfamily PhasianinaeGenus LerwaHodgson 1837Species L lerwaBinomial nameLerwa lerwa Hodgson 1833 2 SynonymsLerwa nivicolaPerdix lerwa protonym Contents 1 Description 2 Taxonomy and systematics 3 Distribution and status 4 Behaviour and ecology 5 References 6 External linksDescription Edit Head showing barring and curved beak This partridge appears grey above and chestnut below with bright red bill and legs and the upperparts finely barred in black and white In flight the pattern of dark brown primaries and secondaries with a narrow trailing white margin make them somewhat like the much larger Tibetan snowcock The 14 feathered tail is dark and barred in white There is variation in the shade and some birds have a nearly black crown 3 The primaries and secondaries are brown and the breast is deep chestnut The abdomen has more white and the lower flanks and feathers around the vent are barred brown and white The under tail coverts are chestnut with black shaft streaks and white tips Young birds have the lower parts mottled and the barring less distinct The tarsus is feathered on the front of the leg half way to the toes 4 5 6 Illustration by John Gould It measures 38 40 cm in length Females weigh 450 580 g males 550 700 g Sexes are similar in plumage female lacks spurs on the tarsus while the male has a blunt spur and sometimes a second incipient spur Downy chicks have a resemblance to the chicks of the blood pheasant 7 Chicks are born with the tarsi feathered and the nostril opening is covered by feathers 8 Taxonomy and systematics EditThis species was first described by Brian Houghton Hodgson in 1833 and given the genus name Lerwa based on the Bhutia name for it in Nepal 9 10 Hodgson initially placed it in the genus Perdix calling it Perdix lerwa 11 A subspecies L l major was described by Richard Meinertzhagen from Szechuan while L l callipygia from south Kansu was noted by Stegmann in 1938 but these are not usually recognized 12 13 14 The species has been retained in this monotypic genus due to various peculiarities including the tarsus feathering and the lack of clear sexual dimorphism in plumage 7 A species of bird louse Chelopistes lervicola has been described as an ectoparasite of this species and other species in this louse genus are known to parasitize the Cracidae Meleagrididae and Odontophorinae of the New World 15 Distribution and status EditSnow partridge is found in the Himalayas from Pakistan to Arunachal Pradesh along the higher ranges mainly 3000 to 5000 m rarely below 2000 m altitude It is found above the tree line but not on as bare and stony terrain as the snowcocks 12 Although said to be found in Afghanistan there is no evidence 3 The species is found over a large area is generally considered to be of low conservation concern It is hunted to some extent due to its habit of being more approachable than snowcock and has declined in population in some areas 7 The usual habitat is alpine pastures open grassy hillsides with grass lichens moss ferns and rhododendrons Is found among small snow patches but not in as stony or bare ground as the snowcock The birds however are very local in their distribution 3 7 8 Behaviour and ecology Edit Illustration from Hume and Marshall s Game birds of India 1890 The snow partridge is found is small groups usually about 6 to 8 but up to 30 during the non breeding season When flushed they usually fly up before scattering away with noisy wing beats The flight is rapid and stirring It has a habit of sunning itself on rocks during the midday 3 The call in the breeding season is said to resemble that of the grey francolin of the plains 7 It has been compared in habit to that of the ptarmigan It is said to feed on mosses lichens berries and the shoots of plants It also swallows grit to aid digestion 10 16 17 The breeding season is May to July The males are believed to be monogynous The nest is a scrape on a hill side under some sheltering rock either scratched out by themselves or already available and usually hidden with vegetation 10 The nest is sometimes lined with moss but well concealed although given away by the male About 3 to 5 eggs pale yellow in color and slightly glossy with reddish brown markings on the rounded end 10 are laid and the female incubates while the male stands sentinel Parent birds may use distraction displays to draw the attention of predators They call in a comparatively softer lower note to the young which respond with chicken like cheep calls 18 19 20 21 Apart from Chelopistes lervicola described as an ectoparasite of this species an Argasid tick Argas himalayensis has been noted 22 23 References Edit BirdLife International 2016 Lerwa lerwa IUCN Red List of Threatened Species 2016 e T22678649A92783114 doi 10 2305 IUCN UK 2016 3 RLTS T22678649A92783114 en Retrieved 11 November 2021 Hodgson B H 1833 Description of Perdix Lerwa Proceedings of the Zoological Society of London 107 a b c d Rasmussen PC amp JC Anderton 2005 Birds of South Asia The Ripley Guide Volume 2 Smithsonian Institution amp Lynx Edicions pp 118 119 Blanford WT 1898 Fauna of British India Birds Vol 4 Taylor and Francis London pp 145 146 Oates EW 1898 A manual of the Game birds of India Part 1 A J Combridge Bombay pp 196 199 Jerdon TC 1864 The Birds of India Volume 3 George Wyman amp Co London pp 555 557 a b c d e Ali S amp S D Ripley 1980 Handbook of the birds of India and Pakistan Vol 2 2nd ed Oxford University Press pp 6 8 ISBN 0 19 562063 1 a b Potapov R L 2000 New information on the snow partridge Lerwa lerwa Hodgson 1833 and its systematic position Bulletin of the British Ornithologists Club 120 2 112 Hume A O amp C H T Marshall 1879 The Game Birds of India Burmah and Ceylon Volume 2 Calcutta A O Hume and Marshall pp 1 7 a b c d Rutgers A 1968 Birds of Asia Taplinger Publishing Co Inc p 5 ISBN 978 0800807702 Hodgson B H 1833 Characters of a new species of Perdix P Lerwa Proceedings of the Zoological Society of London 107 a b Baker ECS 1928 Fauna of British India Birds Volume 5 2nd ed Taylor and Francis London pp 432 435 Meinertzhagen R 1927 Systematic Results of Birds collected at high altitudes in Ladak and Sikkim Ibis 69 3 571 633 doi 10 1111 j 1474 919X 1927 tb05372 x Marien Daniel 1951 Notes on some pheasants from southwestern Asia with remarks on molt American Museum Novitates 1518 1 25 hdl 2246 3909 Clay T 1974 Geographical distribution of the avian lice Phthiraptera a review J Bombay Nat Hist Soc 71 3 536 547 Jerdon TC 1864 The Game birds and Wild fowl of India Military Orphan Press pp 68 70 Finn Frank 1911 The game birds of India and Asia Thacker Spink amp Co Calcutta pp 91 92 Finn Frank 1915 Indian Sporting Birds Francis Edwards London pp 240 242 Whymper SL 1910 Birds nesting in Garhwal J Bombay Nat Hist Soc 19 4 990 991 Hume AO amp CHT Marshall 1880 The Game birds of India Burmah and Ceylon Self published Hume AO 1890 The nests and eggs of Indian Birds Volume 3 2nd ed R H Porter London p 428 Hoogstraal H Kaiser MN 1973 Observations on the Subgenus Argas Ixodoidae Argasidae Argas 7 A A himalayensis New Species Parasitizing the Snow Partridge Lerwa lerwa in Nepal Annals of the Entomological Society of America 66 1 1 3 doi 10 1093 aesa 66 1 1 Clay Theresa 1941 A new genus and species of Mallophaga PDF Parasitology 33 119 129 doi 10 1017 S0031182000024318 External links EditPhotos videos Calls Retrieved from https en wikipedia org w index php title Snow partridge amp oldid 1121277303, wikipedia, wiki, book, books, library,

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