Francolino speronato di Gibuti

Identificazione

This spurfowl is a large, rotund bird of approximately 35 cm (1.15 ft) in length and 940 g (33 oz) in weight. It is grayish-brown overall with white stripes and streaks on its underparts which become finer toward the head. The bird is darker on its back than on its underside. The nape has a hint of rufous, while the top of the head is gray. The forehead, lore, and eye stripe form a black mask, and the chin and throat are whitish. The eyes are brown. The feathers on the body and neck have a gold or straw-colored center that is bordered with dark brown and edged in white. The tail is short. The bill is black with some yellow on the lower mandible, and the Djibouti spurfowl's legs are a greenish-yellow.<p>The sexes are similar, although the male averages slightly larger than the female and has two prominent spurs on the legs, whereas the female is virtually unspurred. The female also has more rufous in its tail. The juvenile resembles the adults, but is duller, with buff barring, rather than streaking, on the underparts.<p>The call of this species is a rattling erk erk erk-kkkkkkkk that descends into a chuckling gurgle. Feeding birds may give a low conversational clucking.<p>No other spurfowl share this bird's restricted range (although the yellow-necked spurfowl occurs elsewhere in Djibouti) so it is unlikely to be confused with any other species.

Tassonomia

Birds in the family Phasianidae, such as the Djibouti spurfowl, are Old World ground-dwelling gamefowl, many of which are found in forest. African spurfowls are placed in the genus Pternistis. They are terrestrial birds that feed on insects, vegetable matter, and seeds. Most species have a hooked upper beak, tails with fourteen feathers, and in many of them the male has tarsal spurs.<p>The Djibouti spurfowl was originally collected on February 22, 1952, by Captain Albospeyre, the military commander of Tadjoura in the Forêt du Day. It was then described by French ornithologists Jean Dorst and Christian Jouanin later that year as Francolinus ochropectus in L'Oiseau et la Revue française d'Ornithologie. Its specific epithet is derived from the Ancient Greek ochros, which means "ochre", and the Latin pectus, meaning "breast". The Djibouti spurfowl is now placed in the genus Pternistis that was introduced by the German naturalist Johann Georg Wagler in 1832.<p>The distinctness of this species has been described as weak by some authors, although its status as a full species has been maintained. It forms a superspecies with Jackson's spurfowl, handsome spurfowl, chestnut-naped spurfowl, and Erckel's spurfowl; A molecular phylogenetic study published in 2019 found that the Djibouti spurfowl was sister to Erckel's spurfowl. The Djibouti spurfowl has no recognized subspecies.<p>This species has formerly been named as the ochre-breasted francolin, the Tadjoura francolin, and the pale-bellied francolin. To the native people of Djibouti, it is known as the kukaaqe.

Nome scientifico

Pternistis ochropectus

Autorità

(Dorst & Jouanin, 1952)

Ordine

Galliformi

Famiglia

Phasianidae

Genere

Pternistis

Areale e habitat

The Djibouti spurfowl is endemic to Djibouti, a nation in eastern Africa, and is known from only two locations. One is the Forêt du Day in the Goda Mountains, approximately 25 km (16 mi) north of the Gulf of Tadjoura. This site is only 15 km2 (3,700 acres) and is undergoing habitat changes. The other site is located in the Mabla Mountains, which are 80 km (50 mi) northeast of the Forêt du Day and remain unsurveyed. This site has been exposed to more human disturbance than the Forêt du Day, and is therefore considered less viable. Combined, the total estimated range of this bird is 58 km2 (14,000 acres).<p>This spurfowl prefers dense African juniper woodland with a closed canopy between 700 and 1,780 m (2,300 and 5,840 ft) in elevation, and preferably on a plateau. Mixed in with this forest habitat are box-trees (Buxus hildebrandtii) and African olives (Olea europaea africana). This spurfowl has been found in secondary woodland, box-tree woodlands (Buxus hildebrandtii), and acacia woodland (Acacia seyal). It is also known to venture into more open woodland and wadis following the breeding season. Much of the bird's African juniper forest habitat has been damaged or destroyed due to human usage; the ability of this dead woodland to support the Djibouti spurfowl remains unknown, although some juveniles have been seen in it. It is believed that the birds are reacting to the destruction of their juniper habitat by trying to find habitat as close to it as possible. It has been noted that due to the decline of the juniper, Buxus hildebrandtii is now the dominant tree in areas most frequently inhabited by the spurfowl.

Migrazione

Resident species

Comportamento

This species lives in small groups and is very shy, often remaining in dense vegetation to avoid detection, and therefore its ecology is very little studied. It is believed that the spurfowl may migrate from lower altitudes to higher altitudes and juniper forest in the warmer months. Its main predator is the common genet. The bird is most active and most likely to call between 6 am and 9 am. After this it may spend most of the day perched motionless in a tree up to 4 m (13 ft) above the ground. It eats berries, seeds, termites and figs. It scratches the ground to collect seeds and, when it finds an area disturbed by warthogs, also scratches the ground for termites. It is monogamous and breeds between December and February.<p>Only one nest has been recorded; this was located on a mountain ledge, and was a shallow grass-lined depression in the earth. These birds roost in nearby trees at heights of 5 to 8 m (16 to 26 ft). It is probably monogamous, and local people say that the clutch is typically 7–9 eggs, but this is unconfirmed.

Conservazione

This species is considered critically endangered by the IUCN because it underwent a 90% population decrease over twenty years. In 1977, there were an estimated 5600 birds in Forêt du Day, which was the only known location for the species at the time. By 1986, this number had dropped to 1500 individuals. The species was discovered at its second site in the Mabla Mountains in 1986. While the population in the Mabla Mountains has yet to be surveyed, numbers in the Forêt du Day continued to drop, with 500–1000 Djibouti spurfowls recorded in 1998 and only 115–135 in 2004. The total world population in 2006 was estimated to be between 612 and 723 adults.<p>This species is threatened because of habitat destruction. At the Forêt du Day site, 95% of its preferred juniper habitat is dead or dying and is unable to support this bird. While an overarching reason behind this destruction remains unknown, overgrazing by cattle, camels, and goats is believed to have been a significant contributor, along with rain, climate change, and a fungal disease. Hunting, the gathering of firewood, egg collecting, and general human disturbance are also believed to be threats. At the Mabla Mountains site, the habitat is also being degraded by the collection of firewood and overgrazing.<p>In 1937, part of the Forêt du Day site was set aside as Day Forest National Park; this designation is no longer valid. There have been studies of the area and the related environmental and economic issues involved; very few of the suggestions made by these surveys have been implemented, partially due to the unrest in Djibouti since the early 1990s. In May 2008, 1,000 km2 (250,000 acres) of forest near the village of Day were set aside for a tree nursery in an attempt to restore some of the spurfowl's damaged habitat. Surveys are under way to determine population sizes and current range, including plans to survey the largely unknown site in the Mabla Mountains and potentially suitable areas in between the two known sites. A promotional campaign in local schools took place in 2008 to raise awareness for the species.

Tendenza della popolazione

declining