Ubara africana

Identificazione

The houbara bustard is a small to mid-sized bustard. It measures 55–75 cm (22–30 in) in length and spans 135–170 cm (53–67 in) across the wings. It is brown above and white below, with a black stripe down the sides of its neck. In flight, the long wings show large areas of black and brown on the flight feathers. The sexes are similar, but the female, between 55–65 cm (22–26 in) tall, is rather smaller and greyer above than the male, at 65–75 cm (26–30 in) tall.[verification needed] The body mass is 1.8–3.2 kg (4.0–7.1 lb) in males and 1.2–1.7 kg (2.6–3.7 lb) in females.[verification needed]

Tassonomia

Psophia undulata was the scientific name proposed by Joseph Franz von Jacquin in 1784 who described a houbara brought from Tripoli to Vienna's Tiergarten Schönbrunn.Otis macqueenii was proposed by John Edward Gray in 1832 for a bustard from India drawn by Thomas Hardwicke.The African houbara was subordinated to the genus Chlamydotis by René Lesson in 1839.Houbara fuertaventurae was proposed by Walter Rothschild and Ernst Hartert in 1894 for a houbara from Fuerteventura island.<p>MacQueen's bustard was long regarded a subspecies of the African houbara. It was proposed as a distinct species in 2003 because of differences in plumage, vocalizations and courtship behaviour.The British Ornithologists' Union's Taxonomic Records Committee's decision to accept this split has been questioned on the grounds that the differences in the male courtship displays may be functionally trivial, and would not prevent interbreeding, whereas a difference in a pre-copulation display would indicate that the two are separate species. The committee responded to this scepticism, by explaining that there are differences in both courtship and pre-copulation displays.<p>Results of analysis of mitochondrial DNA sequences of 73 Chlamydotis samples indicates that the houbara bustard and MacQueen's bustard genetically diverged around 430,000 years ago from a common ancestor. The divergence between the African and Canarian houbara was estimated at 20,000 to 25,000 years ago.

Nome scientifico

Chlamydotis undulata

Autorità

(Jacquin, 1784)

Ordine

Otidiiformes

Famiglia

Otididae

Genere

Chlamydotis

Areale e habitat

The houbara bustard is found in North Africa west of the Nile, mainly in the western part of the Sahara desert region in Mauritania, Morocco, Algeria, Tunisia, Libya, Pakistan and Egypt. Some old records exist from Sudan as well. A small population is found in the Canary Islands. The Asian houbara or MacQueen's bustard which was earlier included in this species occurs east of the Sinai Peninsula. The North African species is sedentary unlike the migratory northern populations of MacQueen's bustards.<p>The subspecies fuertaventurae of the Canary Islands is highly restricted and endangered. A 1997 survey found a total population of about 500 birds.

Migrazione

Nomadic movement

Comportamento

The Houbara bustard has a flamboyant display raising the white feathers of the head and neck and withdrawing the head. Females lay two to four eggs on the ground.It rarely vocalizes, but males make 3-5 low booming notes during breeding displays.<p>It is omnivorous, eating seeds, insects and other small creatures.

Conservazione

The International Fund for Houbara Conservation developed and implemented a global conservation strategy over the past forty years with the objective of ensuring a sustainable future in the wild through conservation programmes and management plans. This strategy consists of an integrated approach combining ecology, protection measures in the wild, conservation breeding, and reinforcement programmes.

Tendenza della popolazione

declining