Northern double-collared sunbird

The northern double-collared sunbird (Cinnyris reichenowi), is a species of bird in the family Nectariniidae. It is found in Burundi, Cameroon, Central African Republic, Democratic Republic of the Congo, Equatorial Guinea, Kenya, Nigeria, Rwanda, South Sudan, and Uganda.[3]

Northern double-collared sunbird
Male
Bwindi Impenetrable Forest, Uganda
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Class: Aves
Order: Passeriformes
Family: Nectariniidae
Genus: Cinnyris
Species:
C. reichenowi
Binomial name
Cinnyris reichenowi
Sharpe, 1891
Subspecies
  • C. r. reichenowi (Sharpe, 1891)
  • C. r. preussi (Reichenow, 1892)
Synonyms[2]

Nectarinia preussi
Cinnyris preussi
Cinnyris genderuensis
Cinnyris kikuyuensis
Cinnyris parvirostris

Description

The northern double-collared sunbird is a medium-sized species. The adult male's head and back is a metallic green that has a steely-blue sheen in some lights. The rump is greyish-brown, the uppertail coverts metallic purple and the tail black, glossed blue. The main flight feathers are dark brown. There is a narrow purple collar beneath the metallic green throat, above a scarlet breast and pale brown belly. There are pale yellow pectoral tufts that are not always visible. The eye is black or dark brown, and the beak and legs are black. The adult female is more drab with upper parts dark olive green and a dark brown tail. The underparts are greyish-olive, the belly being tinged with yellow. The juvenile is similar to the adult female.[3]

Taxonomy

The northern double-collared sunbird Cinnyris reichenowi is part of a large complex of 'double-collared sunbirds' of the genus Cinnyris found throughout sub-Saharan Africa.[4] Mitochondrial data place this species as being most closely related to the southern double-collared sunbird C. chalybea of South Africa, though more research is warranted to confirm this relationship.[5][6]

Classification

Most taxonomic authorities currently recognize two subspecies:[7][8] Cinnyris reichenowi reichenowi of Eastern Africa[9] and C. r. preussi of the Cameroon highlands, Adamawa Plateau, Mt. Cameroon, and Bioko.[10] Three other populations have also been described within the species and later synonymized: C. r. kikuyuensis of the Kenyan highlands,[11] now widely regarded as a synonym of C. r. reichenowi;[12] C. r. genderuensis from Genderu mountain on the Adamawa Plateau, often considered a synonym of C. r. preussi;[13] and C. r. parvirostris from Bioko, considered a synonym of C. r. preussi.[14]

Given the range of variation exhibited across the species' range, subspecific distributions for the aforementioned populations were often uncertain. For example, C. r. preussi was originally believed to be restricted to Mt. Cameroon and adjacent regions, with interior parts of Cameroon being home to C. r. genderuensis.[15][16][17] A recent re-assessment of populations found evidence for the recognition of three subspecies: rift sunbird C. r. reichenowi encompassing all East African populations; volcano sunbird C. r. preussi, found on Bioko, Mt. Cameroon, and the Cameroonian Highlands; and Genderu sunbird C. r. genderuensis, found in the xeric interior Adamawa Plateau of Cameroon, Central African Republic, and probably Nigeria.[6]

Cinnyris reichenowi vs. Nectarinia preussi

Northern double-collared sunbird was originally described as Cinnyris reichenowi from Eastern Africa, but this species was formerly been subsumed within greater Nectarinia along with the majority of African sunbirds, in which case it is referred to as Nectarinia preussi. This shift is due to the fact that golden-winged sunbird Drepanorhynchus reichenowi has taxonomic priority when also included in Nectarinia. This nomenclature shift has caused confusion between northern double-collared sunbirds and golden-winged sunbirds. Furthermore, due to this nomenclature conflict, eastern populations are sometimes referred to as Nectarinia preussi kikuyuensis due to the unavailability of reichenowi within the genus Nectarinia, and the availability of the synonym kikuyuensis.

Ecology

The northern double-collared sunbird is often found in small mixed-species flocks, associating with species like white-eyes (genus Zosterops) and the oriole finch (Linurgus olivaceus). It tends to perch in the mid-storeys of trees, looking from side to side. It feeds on nectar, insects and their larvae, and spiders. The male is territorial and sings vigorously. It is aggressive throughout the year and attacks con-specific males, sometimes resulting in mid-air fights which may continue on the ground. It also does battle with the Cameroon sunbird (Cyanomitra oritis) and the olive-bellied sunbird (Cinnyris chloropygia).[3]

Status

The northern double-collared sunbird is a common species with a very wide range, and the population trend is thought to be steady. No particular threats have been identified and the International Union for Conservation of Nature has assessed the bird's conservation status as being of "least concern".[1]

References
  1. BirdLife International (2016). "Cinnyris reichenowi". IUCN Red List of Threatened Species. 2016: e.T22717887A94556635. doi:10.2305/IUCN.UK.2016-3.RLTS.T22717887A94556635.en. Retrieved 11 November 2021.
  2. "Cinnyris reichenowi". Avibase.
  3. Mann, Clive F.; Cheke, Robert A. (2010). Sunbirds: A Guide to the Sunbirds, Flowerpeckers, Spiderhunters and Sugarbirds of the World. Bloomsbury Publishing. pp. 271–272. ISBN 978-1-4081-3568-6.
  4. Ryan, Peter; Sinclair, Ian (2010). Birds of Africa, south of the Sahara (2nd ed.). Cape Town, South Africa: Struik Nature. ISBN 1770076239.
  5. Bowie, Rauri C. K. (2003). Birds, molecules, and evolutionary patterns among Africa’s islands in the sky. Doctoral Dissertation (Thesis). Cape Town, South Africa: University of Cape Town.
  6. Cooper, Jacob C; Maddox, J Dylan; McKague, Kellie; Bates, John M (2021). "Multiple lines of evidence indicate ongoing allopatric and parapatric diversification in an Afromontane sunbird ( Cinnyris reichenowi )". Ornithology. 138 (2): ukaa081. doi:10.1093/ornithology/ukaa081.
  7. Clements, J. F.; Schulenberg, T. S.; Iliff, Marshall J.; Billerman, S. M.; Fredricks, T. A.; Gerbracht, J. A.; Lepage, Denis; Sullivan, Brian L.; Wood, Christopher L. (2021). "The eBird/Clements checklist of Birds of the World: v2021".
  8. Gill, Frank; Donsker, D.; Rasmussen, Pamela. IOC World Bird List 12.1 (Report). doi:10.14344/IOC.ML.12.1.
  9. Sharpe, R. B. (1891). "Diagnoses of new species of birds from Central East Africa". Ibis. 33: 443-445.
  10. Reichenow, A. (1892). "Zur Vogelfauna von Kamerun". Journal für Ornithologie. 40: 177-195.
  11. Mearns, E. M. (1915). "Descriptions of new African birds of the genera Francolinus, Chalcopelia, Cinnyris, Chalcomitra, Anthreptes, Estrilda, Halcyon, Melittophagus, and Colius". Proceedings of the United States National Museum. 48: 381–394.
  12. Friedmann, H. (1937). "Birds collected by the Childs Frick Expedition to Ethiopia and Kenya Colony. Part 2. Passeres". Bulletin of the United States National Museum. 153.
  13. Reichenow, A. (1910). "Neue Arten aus Afrika". Ornithologische Monatsberichte. 18: 7-10.
  14. Eisentraut, M. (1965). "Kurze Mitteilungen Über einige Vogelrassen von der Insel Fernando Poo". Journal für Ornithologie. 106: 218–219.
  15. Bates, George Latimer (1924). "On the birds collected in North-western and Northern Cameroon and parts of Northern Nigeria". Ibis. 66: 1-45.
  16. Bannerman, D. A. (1948). The Birds of Tropical West Africa: Volume VI. London, UK: The Crown Agents for the Colonies.
  17. Good, A. I. (1953). The Birds of French Cameroon: Part II. Douala, Cameroon: Memoires de L’Institut Francais d’Afrique Noire.
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