Dama gazelle | |
---|---|
Addra gazelle (N. d. ruficollis) at Maryland Zoo in Baltimore, Maryland | |
Mhorr gazelle (N. d. mhorr) at Louisville Zoo in Louisville, Kentucky | |
Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Chordata |
Class: | Mammalia |
Order: | Artiodactyla |
Family: | Bovidae |
Subfamily: | Antilopinae |
Tribe: | Antilopini |
Genus: | Nanger |
Species: | N. dama |
Binomial name | |
Nanger dama (Pallas, 1766) | |
Subspecies [3] | |
also see text | |
Geographic range | |
Synonyms | |
|
The dama gazelle (Nanger dama), also known as the addra gazelle or mhorr gazelle, is a species of gazelle. It lives in Africa, in the Sahara desert and the Sahel. A critically endangered species, it has disappeared from most of its former range due to overhunting and habitat loss, and natural populations only remain in Chad, Mali, and Niger. Its habitat includes grassland, shrubland, semi-deserts, open savanna and mountain plateaus. [1] Its diet includes shrubs, herbs, grasses, leaves (especially Acacia leaves), shoots, and fruit. [4]
In Niger, the dama gazelle has become a national symbol. Under the Hausa name meyna or ménas, [5] the dama gazelle appears on the badge of the Niger national football team, who are popularly called the Ménas. [6] [7]
The dama gazelle is white with a reddish-brown head and neck. Both sexes usually have medium-length ringed horns curved like an "S". Males' horns are about 35 cm (14 in) long, while females' horns are much shorter. The head is small with a narrow muzzle, and the eyes are relatively large. It has a longer neck and longer legs than most gazelles. It is between 90 and 95 cm (35 and 37 in) tall at the shoulder, [8] weighs between 35 and 75 kg (77 and 165 lb), and has a lifespan up to 12 years in the wild or 18 in captivity. [9] A few days following birth, dama young are strong enough to follow the herd, and after a week, they are able to run as fast as the adults. The dama gazelle is considered the largest species of gazelle, with incredibly long legs, which provide extra surface area to dissipate heat, one of the many ways it stays cool in its hot desert environment. It also tends to need more water than some of its desert relatives, but it can withstand fairly long periods of drought. Unlike many other desert mammals, the dama gazelle is a diurnal species, meaning it is active during the day. Always on the alert, the dama gazelle uses a behavior called pronking to warn herd members of danger. Pronking involves the animal hopping up and down with all four of its legs stiff, so that its limbs all leave and touch the ground at the same time. Males also establish territories, and during breeding season, they actively exclude other mature males. They mark their territories with urine and dung piles and secretions from glands near their eyes.
The dama gazelle is generally divided into three subspecies based on the colour of the animal's back, flanks and haunches. These three subspecies occupied three blocks running along the east–west axis of the gazelle's range. The easternmost is the N. dama ruficollis (common name addra gazelle) whose historical range was to the east of 15°E. The westernmost is the N. dama mhorr (common name mohor or mhorr gazelle) whose historical range was to the west of 7°E. Between the two was the historical range of the N. dama dama. Genetic studies have raised questions over the validity of these subspecies and the variation in colour (phenotype) appears to be clinal. [10]
The numbers of this species in the wild have fallen by 80% over the last decade. The IUCN now lists it as critically endangered with a wild population of less than 500 (the most recent review suggests c. 300). It occurs in poor countries and little action is taken to protect the species. The national parks are not well guarded, and poaching still occurs. It has been extirpated from Libya, Mauritania, Morocco and Nigeria. Populations remain in Chad, Mali and Niger, and it has been reintroduced in Senegal and Tunisia. [1] [10]
The Dama gazelle does not need a lot of water, but it needs more than other desert animals. It is not as resistant and perishes from a lack of water during the drought season. The environment has become ill-suited for it. Habitat pressure from pastoral activity is another reason for decline, as are introduced diseases from livestock. [13]
Another reason for the decline of the dama gazelle is habitat destruction. Humans cut down the branches of the trees on which this gazelle feeds. As a result, the trees die and the gazelle cannot eat. [14] Human threats are the most dangerous of threats to the dama gazelle. The main reason this species of gazelle is endangered is because of mechanized hunting; hunters using vehicles increase its decline. Civil unrest, for instance in Sudan, also negatively affects the life of the dama gazelle. Since the gazelle is already having a hard time surviving, these conditions have made its habitat unsuitable. [15] A potential threat the dama gazelle faces is tourism. Tourists want to take pictures of this endangered species, and in doing so, may be perceived as a threat, especially during the hot season. [14] Gazelles will run away from perceived danger, and in the hot season may overheat and die of stress.
Relatively few actions have been taken in the conservation of the dama gazelle. [1] [13] The few measures that have been taken are reserves so the animal can live in a peaceful environment and captive breeding to help rebuild the populations.
A reserve for mhorr gazelles was set up in 1971 to help avoid extinction. This reserve, Parque de Rescate de la Fauna Sahariana (Rescue Park for Saharan Fauna) of the Estación Experimental de Zonas Áridas (Experimental Station of Arid Zones), is in Spain. The reserve has been a success and is still around today. [16]
Another reserve for the mhorr subspecies was set up in Chad, the Ouadi Rime-Ouadi Achime Faunal Reserve. [14] This reserve was effective from 1978–1987, but due to civil war, it was abandoned. [13]
Captive breeding is a very popular way to help an endangered species repopulate. The species reproduces in captivity, but the small founder population potentially presents a problem and may result in inbreeding. [10] [16] The primary focus of European EAZA zoos is the mhorr gazelle (N. d. mhorr), while the primary focus of North American AZA zoos is the addra gazelle (N. d. ruficollis). Mhorr gazelles are also kept in North African facilities and both subspecies are kept in the Middle East. [10] These are maintained as part of the European Endangered Species Programme and Species Survival Plan. The studbooks include 293 mhorr (2014) and 168 addra gazelles (2012). One participant in the addra gazelle plan, White Oak Conservation in Yulee, Florida, has bred the gazelles since 1983, resulting in nearly 300 births. [17] Several hundred additional animals that are not managed as part of the studbooks are kept privately, especially in Texas. [10]
Small population size and inbreeding are a serious concern in this population due to the increased parasite load and reduced reproductive viability. [18] Few substantial in situ conservation efforts have been mounted due to the political situation in their currently fragmented habitat. The survival of this species in the wild depends on more reserves being created in the Sahelian and Saharan zones and better protection in the reserves that do exist. [1] [14] As the population deteriorates, researchers in 2008 stressed the need for healthy captive population and for help to preserve their habitats in the wild. [13]
In 2015, a reintroduction project was conducted in the Western Saharan territory of Morocco, in the Safia Natural Reserve close to the border with Mauritania. [19] 24 gazelles were released in a semi-enclosed facility, seven of which were monitored with telemetry collars. During the course of the project, animals experienced a poaching event, resulting in the deaths of three animals. Additionally, seven animals were killed by domestic dogs from nearby military outposts, suggesting that the animals do not recognize potential predators. This milestone project proved that reintroduction of wild animals in this part of the world is extremely difficult despite the favorable sentiment of the majority of local communities.
Przewalski's horse, also called the takhi, Mongolian wild horse or Dzungarian horse, is a rare and endangered horse originally native to the steppes of Central Asia. It is named after the Russian geographer and explorer Nikolay Przhevalsky. Once extinct in the wild, it has been reintroduced to its native habitat since the 1990s in Mongolia at the Khustain Nuruu National Park, Takhin Tal Nature Reserve, and Khomiin Tal, as well as several other locales in Central Asia and Eastern Europe.
Oryx is a genus consisting of four large antelope species called oryxes. Their pelage is pale with contrasting dark markings in the face and on the legs, and their long horns are almost straight. The exception is the scimitar oryx, which lacks dark markings on the legs, only has faint dark markings on the head, has an ochre neck, and has horns that are clearly decurved.
Species reintroduction is the deliberate release of a species into the wild, from captivity or other areas where the organism is capable of survival. The goal of species reintroduction is to establish a healthy, genetically diverse, self-sustaining population to an area where it has been extirpated, or to augment an existing population. Species that may be eligible for reintroduction are typically threatened or endangered in the wild. However, reintroduction of a species can also be for pest control; for example, wolves being reintroduced to a wild area to curb an overpopulation of deer. Because reintroduction may involve returning native species to localities where they had been extirpated, some prefer the term "reestablishment".
The scimitar oryx, also known as the scimitar-horned oryx and the Sahara oryx, is an Oryx species that was once widespread across North Africa. In 2000, it was declared extinct in the wild on the IUCN Red List. This particular oryx is adapted to harsh desert conditions and can survive for months or even years without drinking water. A grazing animal, it derives most of its daily moisture intake from plants.
The rhim gazelle or rhim, also known as the slender-horned gazelle, African sand gazelle or Loder's gazelle, is a pale-coated gazelle with long slender horns and well adapted to desert life. It is considered an endangered species because fewer than 2500 are left in the wild. They are found in Algeria, Egypt, Tunisia and Libya, and possibly Chad, Mali, Niger, and Sudan.
The South China tiger is a population of the Panthera tigris tigris subspecies that is native to southern China. The population mainly inhabited the Fujian, Guangdong, Hunan and Jiangxi provinces. It has been listed as Critically Endangered on the China's Red List of Vertebrates and is possibly extinct in the wild since no wild individual has been recorded since the late 1980s. In the late 1990s, continued survival was considered unlikely because of low prey density, widespread habitat degradation and fragmentation, and other environmental issues in China. In the fur trade, it used to be called Amoy tiger.
Captive breeding, also known as captive propagation, is the process of keeping plants or animals in controlled environments, such as wildlife reserves, zoos, botanic gardens, and other conservation facilities. It is sometimes employed to help species that are being threatened by the effects of human activities such as climate change, habitat loss, fragmentation, overhunting or fishing, pollution, predation, disease, and parasitism.
Soemmerring's gazelle, also known as the Abyssinian mohr, is a gazelle species native to the Horn of Africa. The species was described and given its binomen by German physician Philipp Jakob Cretzschmar in 1828. Three subspecies are recognized. It is possibly no longer present in Sudan.
The Arabian leopard is the smallest leopard subspecies that was described in 1830. It is native to the Arabian Peninsula, where it was widely distributed in rugged hilly and montane terrain until the late 1970s. Today, the population is severely fragmented and thought to decline continuously, with an estimated 45–200 individuals as of 2008 in three isolated subpopulations that are restricted to western Saudi Arabia, Oman and Yemen.
The World Association of Zoos and Aquariums (WAZA) is the "umbrella" organization for the world zoo and aquarium community. Its mission is to provide leadership and support for zoos, aquariums, and partner organizations of the world in animal care and welfare, conservation of biodiversity, environmental education and global sustainability.
The Yotvata Hai-Bar Nature Reserve is a 3,000-acre (12 km2) breeding and reacclimation center administered by the Israel Nature Reserves & National Parks Authority, situated in the Southern Arava near Yotvata.
The wildlife of Chad is composed of its flora and fauna. Bush elephants, West African lions, buffalo, hippopotamuses, Kordofan giraffes, antelopes, African leopards, cheetahs, hyenas, and many species of snakes are found there, although most large carnivore populations have been drastically reduced since the early 20th century. Elephant poaching, particularly in the south of the country in areas such as Zakouma National Park, is a severe problem.
The wildlife of Niger is composed of its flora and fauna. The protected areas in the country total about 8.5 million hectares, which is 6.6 percent of the land area of the country, a figure which is expected to eventually reach the 11‑percent target fixed by the IUCN with the addition of more areas under the reserve category. Conservation of wildlife is ensured by laws and regulations enacted by the government of Niger, which has enforced a permanent ban on hunting so that animals such as lions, hippos and giraffes are safe in the wild.
Genetic erosion is a process where the limited gene pool of an endangered species diminishes even more when reproductive individuals die off before reproducing with others in their endangered low population. The term is sometimes used in a narrow sense, such as when describing the loss of particular alleles or genes, as well as being used more broadly, as when referring to the loss of a phenotype or whole species.
The EAZA Ex-situ Programme (EEP) is a population management and conservation programme by European Association of Zoos and Aquaria (EAZA) for wild animals living in European zoos. The programme was formerly known as the European Endangered Species Programme.
The South Saharan steppe and woodlands, also known as the South Sahara desert, is a deserts and xeric shrublands ecoregion of northern Africa. This band is a transitional region between the Sahara's very arid center to the north, and the wetter Sahelian Acacia savanna ecoregion to the south. In pre-modern times, the grasslands were grazed by migratory gazelles and other ungulates after the rainfalls. More recently, over-grazing by domestic livestock have degraded the territory. Despite the name of the ecoregion, there are few 'woodlands' in the area; those that exist are generally acacia and shrubs along rivers and in wadis.
The Gadabedji Total Reserve is a nature reserve in the central region of Niger. It is a Total Faunal Reserve IUCN type IV, covering some 76,000 hectares within the northern tip of the Maradi Region, just north of the town of Dakoro, and south of the border with the Agadez Region. The reserve is also recognized biosphere reserve by the Unesco since 2017.
The Persian fallow deer is a deer species once native to all of the Middle East, but currently only living in Iran and Israel. It was reintroduced in Israel. It has been listed as endangered on the IUCN Red List since 2008. After a captive breeding program, the population has rebounded from only a handful of deer in the 1960s to over a thousand individuals.
The Arabian oryx, also called the white oryx, was extinct in the wild as of 1972, but was reintroduced to the wild starting in 1982. Initial reintroduction was primarily from two herds: the "World Herd" originally started at the Phoenix Zoo in 1963 from only nine oryx and the Saudi Arabian herd started in 1986 from private collections and some "World Herd" stock by the Saudi National Wildlife Research Center (NWRC). As of 2009 there have been reintroductions in Oman, Saudi Arabia, Israel, the United Arab Emirates, and Jordan, and as of 2013 the IUCN Red List classifies the species as vulnerable.
The Northeast African cheetah is a cheetah subspecies occurring in Northeast Africa. Contemporary records are known in South Sudan and Ethiopia, but population status in Eritrea, Djibouti, Somalia and Sudan is unknown.