The Venezuelan sylph (Aglaiocercus berlepschi) is an Endangered species of hummingbird in the "coquettes", tribe Lesbiini of subfamily Lesbiinae. It is restricted to two small mountain ranges in northeastern Venezuela.[3][4][1]
| Venezuelan sylph | |
|---|---|
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Aves |
| Clade: | Strisores |
| Order: | Apodiformes |
| Family: | Trochilidae |
| Genus: | Aglaiocercus |
| Species: | A. berlepschi
|
| Binomial name | |
| Aglaiocercus berlepschi (Hartert, 1898)
| |
| |
Taxonomy and systematics
editThe taxonomy of genus Aglaiocercus and of the Venezuelan sylph in particular are complicated. The genus also includes two other sylphs, the long-tailed (A. kingii) and violet-tailed (A. coelestis), and the three have several times been suggested to be either one species, or two with the Venezuelan being a subspecies of the long-tailed. Several additional species have been proposed for inclusion but they have almost conclusively been shown to be hybrids with kingii or one of the other sylphs. Since at least the early 2000s taxonomists have settled on the three-species treatment.[5][6] The Venezuelan sylph is monotypic.[3]
Description
editThe male Venezuelan sylph is 22 cm (8.7 in) long including the 14 to 15 cm (5.5 to 5.9 in) outer tail feathers and weighs 5.5 g (0.19 oz). Females are 9.5 to 11 cm (3.7 to 4.3 in) long and weigh 4.5 g (0.16 oz). Both sexes have a short black bill. Males have a dark glittering green crown and a shining green back. They have a glittering blue gorget and bronzy green underparts with puffy white thighs. The inner tail feathers are short and blue-green; the outer ones are very long and deep violet at the base becoming blue at the end. Females have a glittering blue crown; otherwise their upperparts are similar to the male's. Their throat, breast, and belly are white with green spots. Their tail is short and slightly forked, blue-green with white tips on the outer feathers. Immatures resemble adult females with buffy fringes on the head feathers.[6]
Distribution and habitat
editThe Venezuelan sylph occurs where Sucre, Monagas, and Anzoátegui states meet. It is found in two ranges of the Turimiquire Massif, the eastern Cordillera de Caripe and the western Serranía de Turimiquire. It inhabits subtropical forest and scrubland on coastal mountain slopes between 1,450 and 1,800 m (4,800 and 5,900 ft) of elevation.[6][1]
Behavior
editMovement
editThe Venezuelan sylph is sedentary.[6]
Feeding
editThe Venezuelan sylph feeds on nectar from flowering vines, shrubs, and trees, especially those of genus Inga. It uses trap-lining around a circuit of flowering plants but also will defend specific feeding territories. It also catches insects by hawking from a perch. It typically forages alone or in pairs but sometimes several will feed at a flowering tree.[6]
Breeding
editThe Venezuelan sylph's breeding season spans from August to January. The female builds a domed nest in epiphytes and incubates the eggs. Nothing else is known about the species' breeding phenology.[6]
Vocalization
editThe Venezuelan sylph's apparent song is "a continuous series of buzzy notes 'bzzt...bzzt...bzzt...'." It also makes "a high-pitched rising twittering 'tititi-teetsee..see..seee'."[6]
Status
editThe IUCN has assessed the Venezuelan sylph as Endangered. Its population could be as small as 1500 mature individuals and is believed to be decreasing. It has a very small range whose landscape is increasingly being converted to agriculture and pasture.[1] Though it occurs in Cueva del Guácharo National Park and Macizo Montañoso del Turimiquire Protective Zone, the latter is only nominally protected and deforestation continues there.[6]
References
edit- ^ a b c d BirdLife International (2016). "Venezuelan Sylph Aglaiocercus berlepschi". IUCN Red List of Threatened Species. 2016. Retrieved 18 February 2022.
- ^ "Appendices | CITES". cites.org. Retrieved 2022-01-14.
- ^ a b Gill, F.; Donsker, D.; Rasmussen, P., eds. (January 2022). "Hummingbirds". IOC World Bird List. v 12.1. Retrieved January 15, 2022.
- ^ HBW and BirdLife International (2020) Handbook of the Birds of the World and BirdLife International digital checklist of the birds of the world Version 5. Available at: http://datazone.birdlife.org/userfiles/file/Species/Taxonomy/HBW-BirdLife_Checklist_v5_Dec20.zip [.xls zipped 1 MB] retrieved May 27, 2021
- ^ Remsen, J. V., Jr., J. I. Areta, E. Bonaccorso, S. Claramunt, A. Jaramillo, D. F. Lane, J. F. Pacheco, M. B. Robbins, F. G. Stiles, and K. J. Zimmer. Version 31 January 2022. A classification of the bird species of South America. American Ornithological Society. https://www.museum.lsu.edu/~Remsen/SACCBaseline.htm retrieved February 1, 2022
- ^ a b c d e f g h Altshuler, D.L., E. de Juana, P. F. D. Boesman, and C. J. Sharpe (2020). Venezuelan Sylph (Aglaiocercus berlepschi), 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. https://doi.org/10.2173/bow.vensyl1.01 retrieved February 18, 2022
Further reading
edit
- de Schauensee, Rodolphe Meyer; Phelps, William H. (1978). A Guide to the Birds of Venezuela. Princeton University Press.