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Alaotra grebe | |
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Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Chordata |
Class: | Aves |
Order: | Podicipediformes |
Family: | Podicipedidae |
Genus: | Tachybaptus |
Species: | †T. rufolavatus |
Binomial name | |
†Tachybaptus rufolavatus (Delacour, 1932) | |
Alaotra grebe range |
The Alaotra grebe (Tachybaptus rufolavatus), also known as Delacour's little grebe or rusty grebe, is a recently extinct grebe that was endemic to Lake Alaotra and its surrounding lakes in Madagascar. Experts say that the grebe became extinct after carnivorous fish were introduced into its native habitat.
The grebe was about 25 cm (9.8 in) long. [2] Its ability to fly long distances was restricted because of its small wings. [3] It exhibited no marked sexual dimorphism, although males were slightly larger than females. [4]
The Alaotra grebe fed mostly on fish, although insects were found in the stomachs of a few specimens. [5] Its hefty bill was considered typical of a piscivorous grebe. [5]
The breeding behavior of the Alaotra grebe was largely undocumented. Because little and Alaotra grebes were able to successfully pair off, it is suspected that courtship and pair formation took place in December, while most breeding activity took place between January and March. [5] However, based on some observations of older juveniles with their mothers in late May and early June 1929, it is suspected that some egg laying must have occurred in April to June. [5] Otherwise, the behavior of this grebe is undescribed, although it is suspected to have behaved similarly to the closely related little grebe. [5]
The species declined in the course of the 20th century, mainly because of habitat destruction, entanglement with monofilament gillnets and predation by the introduced blotched snakehead (Channa maculata). [6] Also, the few remaining birds increasingly hybridized with little grebes; as the species differed in several key aspects, the hybrid birds may have suffered from decreased fitness, to the detriment of the rufolavatus gene pool. [7] [8]
The Madagascar pochard, which also lived on Lake Alaotra, was thought to be extinct but was rediscovered in 2006. [9] Unlike this species, however, the grebe had poor powers of dispersal and was never found elsewhere. [8]
The last sighting (which may have been a hybrid with the little grebe) was in 1985 and the species was declared extinct in 2010. [10] [11] Only one photograph of the species is known to exist. [3] [11] [12] Although some species have been classified as extinct and later have been found to still exist, Leon Bennun, the director of the conservation organization BirdLife International has stated that "no hope remains for this species" and blames the "unforeseen consequences" of human action. [12]
This extinction brought the number of confirmed bird extinctions since 1600 AD to 162. The previous declaration of a bird species as extinct was that of the Liverpool pigeon (Caloenas maculata) in 2008. [3] However, that was more a problem of taxonomic recognition as that species was last recorded alive in the late 18th or early 19th century. [3]
"This aquatic species exhibited endemism to the island of Madagascar, exclusively inhabiting the environs of Lake Alaotra and adjacent water bodies. Notably, this grebe displayed a marked preference for the reed beds and papyrus clusters in the vicinity of the lake, which served as its primary nesting habitat." [13]
Grebes are aquatic diving birds in the order Podicipediformes. Grebes are widely distributed freshwater birds, with some species also found in marine habitats during migration and winter. Most grebes fly, although some flightless species exist, most notably in stable lakes. The order contains a single family, the Podicipedidae, which includes 22 species in six extant genera.
The Wildfowl & Wetlands Trust (WWT) is an international wildfowl and wetland conservation charity in the United Kingdom.
The little grebe, also known as dabchick, is a member of the grebe family of water birds. The genus name is from Ancient Greek takhus "fast" and bapto "to sink under". The specific ruficollis is from Latin rufus "red" and Modern Latin -collis, "-necked", itself derived from Latin collum "neck".
The white-backed duck is a waterbird of the family Anatidae. It is distinct from all other ducks, but most closely related to the whistling ducks in the subfamily Dendrocygninae, though also showing some similarities to the stiff-tailed ducks in the subfamily Oxyurinae. It is the only member of the genus Thalassornis.
The Madagascar subhumid forests are a tropical moist broadleaf forest ecoregion that covers most of the Central Highlands of the island of Madagascar. They are included in the WWF's Global 200 list of outstanding ecoregions. Most of the original habitats have been lost due to human pressure.
Lake Alaotra is the largest lake in Madagascar, located in Alaotra-Mangoro Region and on the island's northern central plateau. Its basin is composed of shallow freshwater lakes and marshes surrounded by areas of dense vegetation. It forms the center of the island's most important rice-growing region. It is a rich habitat for wildlife, including some rare and endangered species, as well as an important fishing ground. Lake Alaotra and its surrounding wetlands cover 7,223 square kilometres (2,789 sq mi), and include a range of habitats, including open water, reedbeds, marshes, and rice paddies. The lake itself covers 900 km2 (350 sq mi). Lake Alaotra was declared a wetland of international importance under the international Ramsar Convention on February 2, 2003.
Meller's duck is a species of the dabbling duck genus Anas. It is endemic to eastern Madagascar. Although a population was established on Mauritius in the mid-18th century, this is on the verge of extinction due to habitat loss and competition by feral domestic ducks. The species name of this species is after the botanist Charles James Meller, and its generic name is from the Latin for "duck".
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 least grebe, an aquatic bird, is the smallest member of the grebe family. It occurs in the New World from the southwestern United States and Mexico to Argentina, and also on Trinidad and Tobago, the Bahamas and the Greater Antilles.
Tachybaptus is a genus of small birds of the grebe family. The genus name means "quick diving": it is from Ancient Greek takhys "quick" and bapto "I dip". It has representatives over much of the world, including the tropics.
The Madagascar grebe is a grebe found only in western and central Madagascar. The binomial name commemorates the Austrian ornithologist August von Pelzeln. It is classified as endangered by the IUCN, with a population of less than 5,000. It is threatened by habitat loss, predation by carnivorous fish, and competition with introduced species.
The Atitlán grebe, also known as giant grebe, giant pied-billed grebe, or poc, is an extinct water bird, a relative of the pied-billed grebe. It was endemic at the Lago de Atitlán in Guatemala at an altitude of 1700 m asl. It was described in 1929 by Ludlow Griscom based on a specimen collected in 1926 and had been overlooked in the past. American ecologist Anne LaBastille observed the decline of this species over a period of 25 years. It was declared extinct by 1990.
The wildlife of Iraq includes its flora and fauna and their natural habitats. Iraq has multiple biomes from mountainous region in the north to the wet marshlands along the Euphrates river. The western part of the country is mainly desert and some semi-arid regions. As of 2001, seven of Iraq's mammal species and 12 of its bird species were endangered. The endangered species include the northern bald ibis and Persian fallow deer. The Syrian wild ass is extinct, and the Saudi Arabian dorcas gazelle was declared extinct in 2008.
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Moeyungyi Wetland Wildlife Sanctuary is a protected area in Myanmar's Bago Division, covering an area of 103.6 km2 (40.0 sq mi). It was established in 1988 and gained the status of an Important Bird Area in 2003.
Durrell's vontsira is a small, reddish-brown, fox-like mammal native to the island of Madagascar. Discovered in 2004, it lives only in the biodiverse wetlands of Lake Alaotra. Durrell's vontsira belongs to the family Eupleridae, a group of meat-eating, cat- or fox-like mammals found only on Madagascar. The species is closely related to the brown-tailed mongoose, with which it forms the genus Salanoia. The two are genetically similar, but morphologically distinct, and S. durrelli was described as a new species in 2010.
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Lake Itasy is a lake in central Madagascar. It is located in Itasy Region. It is situated in the municipalities of Ampefy, Soavinandriana, Manazary and Analavory.