Pink pigeon | |
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on Île aux Aigrettes, Mauritius | |
Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Chordata |
Class: | Aves |
Order: | Columbiformes |
Family: | Columbidae |
Genus: | Nesoenas |
Species: | N. mayeri |
Binomial name | |
Nesoenas mayeri (Prévost, 1843) | |
Synonyms | |
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The pink pigeon (Nesoenas mayeri) is a species of pigeon in the family Columbidae endemic to Mauritius. The pink pigeon nearly became extinct in the 1970s and the 1990s and is still very rare. It is the only Mascarene pigeon that has not become extinct. [2] [3] It was on the brink of extinction in 1991 when only 10 individuals remained, but its numbers have increased due to the efforts of the Durrell Wildlife Conservation Trust since 1977. While the population remains at below 500 birds as of 2011, the IUCN downlisted the species from Critically endangered to Endangered on the IUCN Red List in 2000, and then downlisted it again to Vulnerable in 2018.
Initially classified as a true pigeon, the pink pigeon was reclassified in a monotypic genus by Tommaso Salvadori. Recent DNA analyses suggest its nearest relative is the geographically close Malagasy turtle dove (Streptopelia picturatus), and it has thus been suggested that it be placed in the genus Streptopelia , which mostly contains turtle doves. However, the two species form a distinct group that cannot unequivocally be assigned to either Streptopelia or Columba, and placing both species in Nesoenas may best reflect the fact that they seem to belong to a distinct evolutionary lineage. This classification has been followed here. [4] The extinct Réunion pink pigeon is now considered a subspecies.
An adult pink pigeon is about 36–38 centimetres (14–15 in) from beak to tail and 350 grams in weight. Pink pigeons have pale pinkish-grey plumage on their head, shoulders and underside, along with pink feet. The beak is a dark pink color with a white tip. They have dark brown wings, and a broad, rust-colored tail. Their eyes are dark brown surrounded by an eye-ring of red skin. Newly hatched pigeons have sparse, downy-white feathers and closed eyes.[ citation needed ]
The voice of the pink pigeon consists of a flight call that is a short, hardened "hoo hoo". The territorial call of the male pink pigeon is a series of coos. [1]
The species is endemic to the Mascarene island of Mauritius, a small island to the east of Madagascar in the Indian Ocean, and the tiny predator-free island of Île aux Aigrettes off its eastern coast. [5] A subspecies, the Réunion pink pigeon, became extinct on the neighbouring Reunion Island around 1700. [1]
As of 2016, there are five locations places where wild populations of the pink pigeon can be found. Four of these locations belong to Black River Gorges National Park and the fifth to Isle aux Aigrettes. All are monitored by the Mauritian Wildlife Foundation. The species is not migratory. [1]
The species prefers upland evergreen forests, but is equally at home in coastal forests as long as the vegetation is native and not dominated by introduced species such as Chinese Guava (Psidium cattleianum) or the privet ( Ligustrum robustum ). Destruction of such primal forests has been a major reason for its decline. [1]
The breeding season of the pink pigeon begins in August–September, although birds may breed all year round. The male courts the female with a "step and bow" display. Mating is generally monogamous, with the pair making a flimsy platform nest and defending a small area around it (even though the pigeons initially had no natural predators, one mating pair must defend their territory from other mating pairs). Pink pigeons generally mate for life. The female usually lays two white eggs, and incubation duration is two weeks. The male incubates during the day, and the female during night and early day. They may breed often, laying five to 10 eggs in a season; breeding only pauses in the wild whilst in molt, which may be full or a partial-body/head molt.[ citation needed ]
There are more males than females in a population due to greater life expectancy of the male (about five years more) and in the wild a higher chance of the female being predated. One reason for the difference in life span is that producing eggs is extremely metabolically taxing, and since female birds are nearly constantly producing eggs (even when they are not fertilized, just like domestic chickens do) this can end up totaling to a large metabolic tax on the female's survival. In captivity, males remain fertile to an age of 17–18 years, females to an age of 10–11 years.[ citation needed ]
Life history timeline:
The pink pigeon is herbivorous, feeding on both exotic and native plants - consuming buds, flowers, leaves, shoots, fruits and seeds. These birds exhibit ground-feeding behaviors, moving and turning over leaf litter in order to find food and grit (for use as gizzard stones).
Because the pink pigeon's natural habitat has become degraded, natural food sources have in the past been deemed insufficient to sustain the wild population or allow successful breeding and chick-rearing. The MWF and other organizations are providing supplemental feeding stations that offer diet items like whole wheat. To prevent other bird species from plundering this feed, special feeding platforms have been designed that allow access primarily to pink pigeons only. [6] [7]
The pink pigeon is currently classified as Vulnerable by the IUCN, having been downlisted from Endangered in 2018 and Critically Endangered in 2000. [1] [8] Due to habitat destruction and introduced predators, the population had dropped to 10 in 1991. The captive breeding and reintroduction program initiated and supported by the Durrell Wildlife Conservation Trust and largely carried out by the Mauritian Wildlife Foundation has resulted in a population of about 400 in the wild in 2018, as well as a healthy captive population as backup. [1] [9] [8]
Several foundations and organizations have contributed to conservation efforts. [10] In addition to direct conservation efforts such as captive breeding, genetic research, and supplementary feeding efforts, more general research on the species may aid in the formation of more applicable conservation actions. [5]
Since October 2021, N. mayeri has been classified as Critically Depleted by the IUCN. [11]
Habitat degradation, introduced predators, and wildlife disease are the major ongoing threats to the pink pigeon's survival. Only 2% of the native forest remains in Mauritius, with the majority of these remaining forests on upland slopes around the Black River Gorge National Park. [12]
Common predators include the crab-eating macaque (Macaca fascicularis), the small Asian mongoose (Urva auropunctata), rats, and feral cats. Invasive plant species, such as the Chinese guava and privet, dominate native forest plants, preventing their growth. Without these native plant species, the pink pigeon finds it hard to locate sound nesting locations or food sources. Extreme weather events such as cyclones may also further the degradation of habitat. [10]
The feeding stations that provide supplementary feed may accelerate the spread of disease between individuals, who congregate at greater than normal numbers at stations. This may apply to trichomonosis, originally brought to Mauritius by introduced pigeons. [1] Feeding stations therefore have to be closely managed to reduce the associated risks. [13]
An ongoing concern faced by the pink pigeon, as by many endangered species that exist in small remnant populations, is inbreeding depression. [1]
The book Golden Bats and Pink Pigeons by Gerald Durrell describes the conservation efforts. [14]
Mauritius has published a series of postage stamps depicting the pink pigeon.
The Madagascar pochard or Madagascan pochard is an extremely rare diving duck of the genus Aythya. Thought to be extinct in the late 1990s, specimens of the species were rediscovered at Lake Matsaborimena near Bemanevika in Madagascar in 2006. By 2017, a captive breeding program had produced a population of around 90 individuals. The birds were reintroduced to the wild in December 2018.
The echo parakeet is a species of parrot endemic to the Mascarene Islands of Mauritius and formerly Réunion. It is the only living native parrot of the Mascarene Islands; all others have become extinct due to human activity. Two subspecies have been recognised, the extinct Réunion parakeet and the living echo parakeet, sometimes known as the Mauritius parakeet. The relationship between the two populations was historically unclear, but a 2015 DNA study determined them to be subspecies of the same species by comparing the DNA of echo parakeets with a single skin thought to be from a Réunion parakeet, but it has also been suggested they did not constitute different subspecies. As it was named first, the binomial name of the Réunion parakeet is used for the species; the Réunion subspecies thereby became P. eques eques, while the Mauritius subspecies became P. eques echo. Their closest relative was the extinct Newton's parakeet of Rodrigues, and the three are grouped among the subspecies of the rose-ringed parakeet of Asia and Africa.
The Mauritius fody is a rare species of bird in the weaver family. It is endemic to the island of Mauritius. It is classified by BirdLife International as being endangered. It is also on the United States' Endangered Species List with an endangered status.
The Mauritian Wildlife Foundation (MWF) is an independent, non-governmental, non-profit conservation agency working in Mauritius and the Outer Islands to save threatened endemic local flora and fauna.
The Gerald Durrell Endemic Wildlife Sanctuary, also known as GDEWS, is an animal sanctuary founded in 1984, in Western Mauritius. It is an area closed off to the public, in the Black River Gorge region, which is densely forested, and is used for breeding rare, endemic Mauritian species. Among the endangered species in the sanctuary is the Mauritius kestrel, once the rarest bird in the world with only 4 members left. It has been successfully bred and the population has now reached the capacity of Mauritius.
Round Island is an uninhabited islet 22.5 kilometres north of Mauritius. It has an area of 1.69 square kilometres and a maximum elevation of 280 metres. The island has been a nature reserve since 1957 and is administered jointly by the National Parks and Conservation Service and the Mauritian Wildlife Foundation. The island has been designated an Important Bird Area (IBA) by BirdLife International.
The Réunion pink pigeon is an extinct subspecies of pigeon that formerly lived on the Mascarene island of Réunion. It is known from the description of a rusty-red pigeon given by Dubois in 1674 and a single subfossil humerus that agrees with that of the pink pigeon of Mauritius in generic characteristics, except being slightly longer. Also, Dubois' reference to the bill being red at the base and the eyes being surrounded by a red ring suggest that this species was closely allied to the Mauritius taxon. Dubois' description was as follows:
wild pigeons, everywhere full with them, some with slaty-coloured feathering [Alectroenas?], the others russet-red [N. duboisi]. They are a little larger than the European pigeons, and have larger bills, red at the end close to the head, the eyes ringed with the colour of fire, like pheasants. There is a season when they are so fat that one can no longer see their cloaca [croupion]. They are very good tasting. Wood-pigeons and turtle-doves, as one sees in Europe and as good.
The Mauritius blue pigeon is an extinct species of blue pigeon formerly endemic to the Mascarene island of Mauritius in the Indian Ocean east of Madagascar. It has two extinct relatives from the Mascarenes and three extant ones from other islands. It is the type species of the genus of blue pigeons, Alectroenas. It had white hackles around the head, neck and breast and blue plumage on the body, and it was red on the tail and the bare parts of the head. These colours were thought similar to those of the Dutch flag, a resemblance reflected in its French common name, Pigeon Hollandais. The juveniles may have been partially green. It was 30 cm (12 in) long and larger and more robust than any other blue pigeon species. It fed on fruits, nuts, and molluscs, and was once widespread in the forests of Mauritius.
The Mauritian flying fox, also known as Greater Mascarene flying fox or Mauritius fruit bat is a large megabat species endemic to Mauritius and La Réunion.
The Mauritius kestrel is a bird of prey from the family Falconidae endemic to the forests of Mauritius, where it is restricted to the southwestern plateau's forests, cliffs, and ravines. It is the most distinct of the Indian Ocean kestrels. It colonized its island home to evolve into a distinct species probably during the Gelasian. It is the most distant living species among the western Indian Ocean kestrels.
The wildlife of Mauritius consists of its flora and fauna. Mauritius is located in the Indian Ocean to the east of Madagascar. Due to its isolation, it has a relatively low diversity of wildlife; however, a high proportion of these are endemic species occurring nowhere else in the world. Many of these are now threatened with extinction because of human activities including habitat destruction and the introduction of non-native species. Some have already become extinct, most famously the dodo which disappeared in the 17th century.
The island bronze-naped pigeon, also known as the São Tomé bronze-naped pigeon or São Tomé pigeon, is a species of bird in the pigeon family, Columbidae. It is endemic to the Gulf of Guinea, where it is found on the islands of São Tomé, Príncipe, and Annobón. It inhabits rainforest, secondary forests, and plantations at elevations of up to 1,668 m (5,472 ft), although it is more common at lower elevations. A small, darkish pigeon, it has a total length of 28 cm (11 in). Adult males have slate-grey heads and upper backs, blackish-grey wings, backs, and tails, buffy-white throats, ashy-grey breasts and bellies, and rufous vents. The back of the neck and upper back are glossy pink or green, while the wings have a green tinge to them. Females are similar, but have browner undersides, duller and less glossy upperparts, and more rusty-orange outer tail feathers.
The Malagasy turtle dove or Madagascar turtle dove is a bird species in the pigeon and dove family, Columbidae.
Nesoenas is a bird genus in the pigeon and dove family, Columbidae. It is often included with the typical turtle-doves in Streptopelia or the typical pigeons (Columba). By those who accepted it, it was usually treated as monotypic, containing only the pink pigeon of Mauritius.
The Mascarene martin or Mascarene swallow is a passerine bird in the swallow family that breeds in Madagascar and in the Mascarene Islands. The nominate subspecies occurs on Mauritius and Réunion and has never been found away from the Mascarene Islands, but the smaller Madagascan subspecies, P. b. madagascariensis, is migratory and has been recorded wintering in East Africa or wandering to other Indian Ocean islands.
The Round Island boa, also known commonly as the Round Island keel-scaled boa and the Round Island ground boa, is a species of nonvenomous snake in the monotypic genus Casarea in the family Bolyeriidae. The species is endemic to Round Island, Mauritius. No subspecies are currently recognized.
Carl Gwynfe Jones, MBE is a Welsh conservation biologist, who has been employed by Durrell Wildlife Conservation Trust since 1985, and a founding member (1984) and current scientific director of Mauritian Wildlife Foundation (MWF). Additionally he is Chief Scientist at Durrell Wildlife Conservation Trust, and an honorary professor in ecology and conservation biology at the University of East Anglia. Often outspoken on the importance of knowing your species and using intuition, empathy and practical knowledge over dogmatic education, Jones is best known for his work in recovering the Mauritius kestrel from just four individuals in 1974, to an estimated 400. Working in the Mascarene Islands since 1979, Jones has led five successful bird restoration projects where the starting population has numbered less than 12 individuals; as a consequence Mauritius has averted more bird extinctions than any other country. Jones has pioneered the use of ecological or taxon replacements to fill the ecological roles of extinct animals and successfully restored levels of endemic vegetation to previously denuded islets. Jones' work has been highlighted in Douglas Adams and Mark Carwardine's 1990 radio documentary Last Chance to See, along with its accompanying book, as well as David Quammen's 1996 book The Song of the Dodo: Island Biogeography in an Age of Extinctions.
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Ile aux Aigrettes is an islet off the south-east coast of Mauritius. It functions as a nature reserve and a scientific research station. It is also a popular visitors attraction — both for tourists and for Mauritians.