| Djibouti Francolin | |
|---|---|
| Conservation status | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Aves |
| Order: | Galliformes |
| Family: | Phasianidae |
| Subfamily: | Perdicinae |
| Genus: | Pternistis |
| Species: | P. ochropectus |
| Binomial name | |
| Pternistis ochropectus (Dorst & Jouanin, 1952) |
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| Synonyms | |
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The Djibouti Francolin, Pternistis ochropectus, is one of over forty species of francolins, a group of birds in the Phasianidae family. It is critically endangered and found only in Djibouti, a nation in eastern Africa. This species is grayish-brown overall with white stripes and streaks on its underparts which become finer towards the upperparts. It has black markings on the head and a gray crown and has a short tail. It is 35 cm (1.15 ft) in length, and weighs 940 g (33 oz).
Its natural habitat is high altitude subtropical or tropical dry forests composed primarily of African juniper. However, the juniper forests preferred by the francolin are dying, so it may be found in other habitats, such as box-tree forests. This bird is only known from two locations in Djibouti, one of which is largely unsurveyed. It can be found in small groups and is extremely shy. It is known to feed on berries, seeds, and termites, and it breeds between December and February. It is considered a critically endangered species because it underwent a 90% population decline in twenty years. The degrading of its juniper habitat through man-made disturbances, such as overgrazing, is a major threat to the francolin's survival. Ongoing conservation work includes the restoration of some juniper forest, and surveys to obtain accurate population counts and to raise awareness.
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Birds in the Phasianidae family, such as the Djibouti Francolin, are Old World ground-dwelling gamefowl, many of which are found in forests.[2] Francolins are terrestrial birds of the 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.[3] Of the 41 extant species, 36 are found solely in Africa.
The Djibouti Francolin was originally collected on February 22, 1952 by Captain Albospeyre, the military commander of Tadjoura in the Forêt du Day.[4] It was then described by French ornithologists Jean Dorst and Christian Jouanin later that year as Francolinus ochropectus in L'Oiseau et la Revue Francaise d'Ornithologie.[5] Its specific epithet is derived from the Ancient Greek ochros, which means "ochre",[6] and the Latin pectus, meaning "breast".[7] Other authors have since proposed moving the species to other genera, including Oreocolinus and Pternistis, the latter a move proposed in a recent attempt to reorganize Francolinus, and one which would include 23 other francolins.[8] Though some still maintain all these in Francolinus,[9][10] the split into multiple genera is becoming more widespread.[11][12]
The distinctness of this species has been described as weak by some authors,[8] although its status as a full species has been maintained.[8][10] It forms a superspecies with Jackson's Francolin, Handsome Francolin, Chestnut-naped Francolin, and Erckel's Francolin;[8] it is particularly closely related to the latter two species and is intermediate to them in both location and morphological features. The Djibouti Francolin has no recognized subspecies.[8]
This species has formerly been named as the Ochre-breasted Francolin, the Tadjoura Francolin, and the Pale-bellied Francolin.[13] To the native people of Djibouti, it is known as the kukaaqe.[14]
This francolin is a large, rotund bird of approximately 35 cm (1.15 ft) in length and 940 g (33 oz) in weight.[15][16] It is grayish-brown overall with white stripes and streaks on its underparts which become finer toward the head.[15] The bird is darker on its back than on its underside.[16] The nape has a hint of rufous, while the top of the head is gray.[15] The forehead, lore, and eye stripe form a black mask,[16] and the chin and throat are whitish.[16] The eyes are brown.[17] The feathers on the body and neck have a gold or straw-colored center that is bordered with dark brown and edged in white.[16] The tail is short.[15] The bill is black with some yellow on the lower mandible, and the Djibouti Francolin's legs are a greenish-yellow.[15]
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.[18] The females also has more rufous in its tail.[17] The juvenile resembles the adults, but is duller, with buff barring, rather than streaking, on the underparts.[18]
The call of this species is a rattling erk erk erk-kkkkkkkk that descends into a chuckling gurgle.[15] Feeding birds may give a low conversational clucking.[18]
No other francolin share this bird's restricted range (although the Yellow-necked Francolin occurs elsewhere in Djibouti) so it is unlikely to be confused with any other species.[18]
The Djibouti Francolin 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.[19] This site is only 15 km2 (3,700 acres) and is undergoing habitat changes.[4] The other site is located in the Mabla Mountains, which are 80 km (50 mi) northeast of the Forêt du Day and remain unsurveyed.[4][19] This site has been exposed to more human disturbance than the Forêt du Day, and is therefore considered less viable.[2] Combined, the total estimated range of this bird is 58 km2 (14,000 acres).[15]
This francolin prefers dense African juniper woodland with a closed canopy between 700 and 1,780 m (2,300 and 5,840 ft) in elevation,[2][20][5] and preferably on a plateau.[15] Mixed in with this forest habitat are box-trees (Buxus hildenbrandtii) and African olives (Olea europaea africana).[2] This francolin has been found in secondary woodland, box-tree woodlands (Buxus hildenbrandtii), and acacia woodland (Acacia sayal).[19][21] It is also known to venture into more open woodland and wadis following the breeding season.[14][22] 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 Francolin remains unknown, although some juveniles have been seen in it.[15] 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.[22] It has been noted that due to the decline of the juniper, Buxus hildenbrandtii is now the dominant tree in areas most frequently inhabited by the francolin.[2]
This species lives in small groups and is very shy, often remaining in dense vegetation to avoid detection,[20] and therefore its ecology is very little studied.[2] It is believed that the francolin may migrate from lower altitudes to higher altitudes and juniper forest in the warmer months.[19] Its main predator is the common genet.[17] The bird is most active and most likely to call between 6 am and 9 am.[2] After this it may spend most of the day perched motionless in a tree up to 4 m (13 ft) above the ground.[17] It eats berries, seeds, termites and figs.[4] It scratches the ground to collect seeds and, when it finds an area disturbed by warthogs, also scratches the ground for termites.[17] It is monogamous and breeds between December and February.[4]
Only one nest has been recorded; this was located on a mountain ledge, and was a shallow grass-lined depression in the earth.[4] These birds roost in nearby trees at heights of 5 to 8 m (16 to 26 ft).[16] It is probably monogamous, and local people say that the clutch is typically 7–9 eggs, but this is unconfirmed.[18]
This species is considered critically endangered by the IUCN because it underwent a 90% population decrease over twenty years.[19] In 1977, there were an estimated 5600 birds in Forêt du Day, which was the only known location for the species at the time.[4] By 1986, this number had dropped to 1500 individuals. The species was discovered at its second site in the Mabla Mountains in 1986.[4] 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 Francolins recorded in 1998 and only 115–135 in 2004.[4] The total world population in 2006 was estimated to be between 612 and 723 adults.[4]
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.[4] While an overarching reason behind this destruction remains unknown, overgrazing by cattle, camels, and goats is believed to have been a significant contributor,[4] along with rain, climate change, and a fungal disease.[4] Hunting, the gathering of firewood, egg collecting, and general human disturbance are also believed to be threats.[20][21] At the Mabla Mountains site, the habitat is also being degraded by the collection of firewood and overgrazing.[4]
In 1937, part of the Forêt du Day site was set aside as Day Forest National Park; this designation is no longer valid.[4] 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.[4] 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 francolin's damaged habitat.[20] 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.[15] A promotional campaign in local schools took place in 2008 to raise awareness for the species.[20]
The majority of native people in areas surrounding the francolin's range believe that the species is important, either because of its meat, which may be eaten by the Muslims who comprise the predominant religious group of the region, or because it is part of the natural heritage of the region.[2] While the species is rarely eaten today due to its rarity, decades ago the species was so common that it was easily captured when it approached nearby villages.[2]
The Djibouti Francolin has been featured on two stamps; one in 1989 from Djibouti, and another from the French Territory of the Afars and the Issas, which was what Djibouti was known as under French rule, in 1972.[23]