Madagascar pochard

Last updated

Madagascar pochard
Madagascar Pochard, Captive Breeding Program, Madagascar 2.jpg
Male Madagascar pochard, captive breeding program, Madagascar
Madagascar Pochard, Captive Breeding Program, Madagascar 1.jpg
Female Madagascar pochard, captive breeding program, Madagascar
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Anseriformes
Family: Anatidae
Genus: Aythya
Species:
A. innotata
Binomial name
Aythya innotata
(Salvadori, 1894)
RangeMadagascarPochard.PNG
Former range (in red)
Synonyms

Nyroca innotata Salvadori, 1894 (basionym)

The Madagascar pochard or Madagascan pochard (Aythya innotata; Malagasy : Fotsy maso, Onjo [2] ) 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.

Contents

The Madagascar pochard feeds mainly on aquatic insects, unlike other diving ducks in the same genus, Aythya . Ducklings begin making short dives at around 14 days old, before which they feed on the surface.

Taxonomy

The Madagascar pochard in the Catalogue of the Birds in the British Museum. Volume 27, 1895. NyrocaInnotataKeulemans.jpg
The Madagascar pochard in the Catalogue of the Birds in the British Museum . Volume 27, 1895.

The Madagascar pochard was largely overlooked by scientists in the 19th century, as those that saw it assumed they were seeing ferruginous ducks instead. Even after its description in 1894 little notice was taken of the species, and even numbers are hard to gauge from early accounts of the species. Based on the accounts written by Webb and Delacour's in the 1920s and 1930s it seemed that the bird was still relatively common at Lake Alaotra. [3]

The Madagascar pochard is generally thought to be closely related to the Hardhead, Baer's pochard and ferruginous duck. It is monotypic, having no described or known subspecies. [4]

Description

The pochard is a medium-sized duck between 42 and 56 centimeters in size. Juvenile ducks have brown irises and are a pale, dull brown or chestnut color with a darker stomach. The adults are darker in color, though during a male duck's first winter, its iris will turn white. Breeding males have dark chestnut heads, chins, throats, breasts, and necks, with blackish brown on the top side of the body. Their wings are dark brown with a white bar. The area under the bodies from the stomach to the tail fades to white, as do the undersides of the wings. The beaks and legs are dark grey with black nails. [5]

Vocalizations may include "[when] in display [...] the male utters a cat-like wee-oow and a rolling rrr, while the female gives a harsh squak." [5]

Distribution and ecology

The species exclusively lives in inland wetlands in Madagascar, where it is endemic. [6] Currently, the only wild populations are at Lake Sofia and Lake Matsaborimena. [7]

Historically, the birds preferred shallow lakes and marshes with dense vegetation; however, the rediscovered population was found in a cold, deep [7] crater lake that had few aquatic plants and was surrounded by heavy forest, and other remote crater lakes may have been inhabitable due to the birds' requirements for shallower water. [8] [6] Its previous habitat in the Lake Alaotra basin was disturbed by rice cultivation and invasive introduced fishes. [8]

Behaviour

Madagascar pochards do not migrate, do not usually form flocks, and are usually found in pairs or as single ducks. [6]

Diet and feeding

The Madagascar pochard spends 38% of its day feeding. The diet is dominated by aquatic insects; a study examining their faeces found that caddisflies were the most commonly found insect, followed by dragonfly larvae, bugs (Hemiptera) and flies from the family Chironomidae. Stable isotope analysis and the faecal studies have shown that their diet includes very little plant material, which is unusual when compared to their relatives in the genus Aythya. [3]

The bird dives for much of its food, with a mean diving time of around 24 seconds. Ducklings feed on the surface until they are old enough to dive, at around 14 days, and make shorter dives once they do dive (around 10 seconds). [3]

Breeding

Observers have noted nesting behavior from July to February, sometimes with multiple attempts at nesting. Nests are found 20–40 cm above water, in the plants along the lake or marsh edges (noted in Cyperaceae), with 6 to 10 eggs per clutch. [6]

Relationship with humans

Decline

The 1960 specimen now held by the Naturalis Biodiversity Center Naturalis Biodiversity Center - ZMA.AVES.15246 - Aythya innotata Salvadori, 1894 - Anatidae - skin specimen.jpeg
The 1960 specimen now held by the Naturalis Biodiversity Center

The duck probably started to decline dramatically sometime in the late 1940s or early 1950s. The cause of decline was the introduction of numerous fish species in the lake that killed most of the pochard chicks and damaged nesting sites. Adult birds are also likely to have become victims of introduced fishes. Rice cultivation, cattle grazing on the shores, burning of shore vegetation, introduced mammals (rats), gill-net fishing and hunting are all factors that led to the duck's disappearance from the lake. [9] The last record of multiple birds at Lake Alaotra is from 9 June 1960 when a small flock of about 20 birds was spotted on the lake. Despite the rarity of the species in 1960, a male was shot, and the specimen was held by the Zoological Museum Amsterdam, and later the Naturalis Biodiversity Center. [10] There is a very dubious report of a sighting made outside Antananarivo in 1970. [9]

Rediscovery and reintroduction

Before it was rediscovered in 2006, the last confirmed sighting of the species was at Lake Alaotra on the Central Plateau of Madagascar in 1991. The single male then encountered was captured and kept in the Antananarivo Botanical Gardens until it died one year later. Intensive searches and publicity campaigns in 1989–1990, 1993–1994 and 2000–2001 failed to produce any more records of this bird.

However, a flock of nine adults and four recently hatched ducklings were discovered at Lake Matsaborimena, in a remote area of northern Madagascar, in November 2006. [11] [12] Though their habitat was "too deep and too cold for the pochards to thrive", it was one of the few wetlands on the island still capable of supporting the remaining few birds due to damage from pollution, invasive species, and agricultural practices in other wetlands. [7] The species was placed in the new "Possibly Extinct" category in the 2006 IUCN Red List; following the rediscovery, its old status of Critically Endangered was restored in the 2007 issue. [9] [13] As of 2008, only 25 adult birds had been counted in the wild. [14]

Conservation

A. innotata in a captive breeding program in Madagascar. Madagascar Pochard, Captive Breeding Program, Madagascar 3.jpg
A.innotata in a captive breeding program in Madagascar.

In 2009, a rescue plan involving the Durrell Wildlife Conservation Trust and the Wildfowl and Wetlands Trust removed a batch of ready-to-hatch eggs from a lake-side nest and incubated them in a lab that was set up in a tent beside the lake. After hatching, the day-old chicks were taken to a holding facility in a local hotel. [14] By the end of 2009, the organizations, including The Peregrine Fund, collected three clutches for 24 eggs to hatch 23 ducklings in total. [8] [6] Reared in captivity, they hatched eighteen ducklings in April 2012 at the captive breeding centre in Antsohihy, bringing the total population to 60. [12] [15] [16]

2011 marked the first chick to hatch from captive breeding efforts. [6] In April 2013, the population reached 80. [17] In Autumn 2017 the population reached 90, causing the Wildfowl and Wetlands Trust and the Durrell Wildlife Conservation Trust to begin preparations for the reintroduction process at a suitable lake in Madagascar, Lake Sofia, [18] including working with the communities surrounding the lake. [7] In December 2018, 21 of the birds were released at Lake Sofia, where floating aviaries were installed to protect the birds. [7]

See also

Related Research Articles

<span class="mw-page-title-main">WWT Arundel</span>

WWT Arundel is one of ten wildfowl and wetland nature reserves managed by the Wildfowl and Wetlands Trust, a nature conservation charity in the United Kingdom. The 60 acres (24 ha) reserve is situated at the foot of the Offham Hangar, a part of the Arun valley in Arundel, West Sussex, England.

<span class="mw-page-title-main">Diving duck</span> Tribe of birds

The diving ducks, commonly called pochards or scaups, are a category of duck which feed by diving beneath the surface of the water. They are part of Anatidae, the diverse and very large family that includes ducks, geese, and swans.

<span class="mw-page-title-main">Mallard</span> Species of duck

The mallard or wild duck is a dabbling duck that breeds throughout the temperate and subtropical Americas, Eurasia, and North Africa. It has been introduced to New Zealand, Australia, Peru, Brazil, Uruguay, Argentina, Chile, Colombia, the Falkland Islands, and South Africa. This duck belongs to the subfamily Anatinae of the waterfowl family Anatidae. Males have green heads, while the females have mainly brown-speckled plumage. Both sexes have an area of white-bordered black or iridescent purple or blue feathers called a speculum on their wings; males especially tend to have blue speculum feathers. The mallard is 50–65 cm (20–26 in) long, of which the body makes up around two-thirds the length. The wingspan is 81–98 cm (32–39 in) and the bill is 4.4 to 6.1 cm long. It is often slightly heavier than most other dabbling ducks, weighing 0.7–1.6 kg (1.5–3.5 lb). Mallards live in wetlands, eat water plants and small animals, and are social animals preferring to congregate in groups or flocks of varying sizes.

<span class="mw-page-title-main">Redhead (bird)</span> Species of North American diving duck

The redhead is a medium-sized diving duck. The scientific name is derived from Greek aithuia, an unidentified seabird mentioned by authors including Hesychius and Aristotle, and Latin americana, of America. The redhead is 37 cm (15 in) long with an 84 cm (33 in) wingspan. Redhead weight ranges from 2.0 to 2.5 lbs, with males weighing an average of 2.4 lbs and females weighing an average of 2.1 lbs. It belongs to the genus Aythya, together with 11 other described species. The redhead and the common pochard form a sister group which together is sister to the canvasback.

<span class="mw-page-title-main">Ring-necked duck</span> Species of bird

The ring-necked duck is a diving duck from North America commonly found in freshwater ponds and lakes. The scientific name is derived from Greek aithuia, an unidentified seabird mentioned by authors including Hesychius and Aristotle, and Latin collaris, "of the neck" from collum, "neck".

<span class="mw-page-title-main">Common pochard</span> Species of bird

The common pochard, known simply as pochard in the United Kingdom, is a medium-sized diving duck in the family Anatidae. It is widespread across the Palearctic. It breeds primarily in the steppe regions of Scandinavia and Siberia, and winters further south and west.

<span class="mw-page-title-main">Tufted duck</span> Species of bird

The tufted duck or tufted pochard is a small diving duck with a population of close to one million birds, found in northern Eurasia. The scientific name is derived from Ancient Greek aithuia, an unidentified seabird mentioned by authors including Hesychius and Aristotle, and Latin fuligo 'soot' and gula 'throat'.

<span class="mw-page-title-main">Wood duck</span> Species of bird

The wood duck or Carolina duck is a species of perching duck found in North America. The drake wood duck is one of the most colorful North American waterfowls.

<span class="mw-page-title-main">Greater scaup</span> Species of bird

The greater scaup, just scaup in Europe or, colloquially, "bluebill" in North America, is a mid-sized diving duck, larger than the closely related lesser scaup. It spends the summer months breeding in Alaska, northern Canada, Siberia, and the northernmost reaches of Europe. During the winter, it migrates south to the coasts of North America, Europe, and Japan.

<span class="mw-page-title-main">Lesser scaup</span> Species of bird

The lesser scaup is a small North American diving duck that migrates south as far as Central America in winter. It is colloquially known as the little bluebill or broadbill because of its distinctive blue bill. The origin of the name scaup may stem from the bird's preference for feeding on scalp—the Scottish word for clams, oysters, and mussels; however, some credit it to the female's discordant scaup call as the name's source. It is apparently a very close relative of the Holarctic greater scaup or "bluebill", with which it forms a superspecies. The scientific name is derived from Ancient Greek aithuia an unidentified seabird mentioned by authors including Hesychius and Aristotle, and Latin, affinis "related to", from its resemblance to the greater scaup.

<span class="mw-page-title-main">Ferruginous duck</span> Species of bird

The ferruginous duck, also known as ferruginous pochard, common white-eye or white-eyed pochard, is a medium-sized diving duck from Eurosiberia. The scientific name is derived from Greek aithuia an unidentified seabird mentioned by authors including Hesychius and Aristotle, and nyrok, the Russian name for a duck.

<i>Aythya</i> Genus of birds

Aythya is a genus of diving ducks. It has twelve described species. The name Aythya comes from the Ancient Greek word αυθυια, which may have referred to a sea-dwelling duck or an auklet.

<span class="mw-page-title-main">Fulvous whistling duck</span> Species of bird in the family Anatidae, widespread in tropical wetlands

The fulvous whistling duck or fulvous tree duck is a species of whistling duck that breeds across the world's tropical regions in much of Mexico and South America, the West Indies, the southern United States, sub-Saharan Africa and the Indian subcontinent. It has plumage that is mainly reddish brown, long legs and a long grey bill, and shows a distinctive white band across its black tail in flight. Like other members of its ancient lineage, it has a whistling call which is given in flight or on the ground. Its preferred habitat consists of wetlands with plentiful vegetation, including shallow lakes and paddy fields. The nest, built from plant material and unlined, is placed among dense vegetation or in a tree hole. The typical clutch is around ten whitish eggs. The breeding adults, which pair for life, take turns to incubate, and the eggs hatch in 24–29 days. The downy grey ducklings leave the nest within a day or so of hatching, but the parents continue to protect them until they fledge around nine weeks later.

<span class="mw-page-title-main">Lake Alaotra</span> Lake in Madagascar

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.

<span class="mw-page-title-main">Bernier's teal</span> Species of bird

Bernier's teal, also known as the Madagascar teal, is a species of duck in the genus Anas. It is endemic to Madagascar, where it is found only along the west coast. Part of the "grey teal" complex found throughout Australasia, it is most closely related to the Andaman teal.

<span class="mw-page-title-main">Meller's duck</span> Species of bird

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".

<span class="mw-page-title-main">Baer's pochard</span> Species of bird

Baer's pochard is a diving duck found in eastern Asia. It is a resident bird in North and Central China, formerly bred in southeast Russia and Northeast China, migrating in winter to southern China, Vietnam, Japan, and India. Baer's pochard is a monotypic species. The holotype was collected in middle Amur.

<span class="mw-page-title-main">New Zealand scaup</span> Species of bird

The New Zealand scaup, also known as the black teal or pāpango in Māori, is a diving duck species of the genus Aythya endemic to New Zealand. They weigh around 650 grams (23 oz) and measure around 40 centimetres (16 in), and have dark-coloured plumage. They are found throughout New Zealand in deep natural and man-made lakes and ponds.

<span class="mw-page-title-main">Alaotra grebe</span> Species of bird

The Alaotra grebe, 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.

<span class="mw-page-title-main">Madagascar grebe</span> Species of bird

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.

References

  1. BirdLife International (2018). "Aythya innotata". IUCN Red List of Threatened Species . 2018: e.T22680380A128903025. doi: 10.2305/IUCN.UK.2018-2.RLTS.T22680380A128903025.en . Retrieved 12 November 2021.
  2. "Aythya innotata (Madagascar Pochard) - Avibase". avibase.bsc-eoc.org. Retrieved 2018-12-29.
  3. 1 2 3 Bamford, A; Sam, T S; Razafindrajao, F; Robson, H; Woolaver, L; Ren de Roland, L (26 August 2014). "The status and ecology of the last wild population of Madagascar Pochard Aythya innotata". Bird Conservation International. 25 (1): 97–110. doi: 10.1017/S0959270914000033 .
  4. Carboneras, C; Kirwan, G. M. (2018). del Hoyo, Josep; Elliott, Andrew; Sargatal, Jordi; Christie, David A; de Juana, Eduardo (eds.). "Madagascar Pochard (Aythya innotata)" . Handbook of the Birds of the World Alive. Barcelona: Lynx Edicions. Retrieved 30 December 2018.
  5. 1 2 Morris, Pete; Hawkins, Frank (1998). Birds of Madagascar: A Photographic Guide. Yale University Press. ISBN   9780300077551.
  6. 1 2 3 4 5 6 "The IUCN Red List of Threatened Species". IUCN Red List of Threatened Species. Retrieved 2018-12-29.
  7. 1 2 3 4 5 Gill, Victoria (2018-12-28). "World's rarest bird gets new home". BBC News. Retrieved 2018-12-28.
  8. 1 2 3 "Madagascar pochard | Durrell Wildlife Conservation Trust". wildlife.durrell.org. Retrieved 2018-12-29.
  9. 1 2 3 BirdLife International (2007b): Madagascar Pochard – BirdLife Species Factsheet. Retrieved 26 August 2007.
  10. "Specimen ZMA.AVES.15246 | Naturalis Bioportal". bioportal.naturalis.nl. Retrieved 2024-02-04.
  11. "Diving duck resurfaces". Birdlife. 20 November 2006.
  12. 1 2 "Rare Madagascar duck successfully bred by Durrell". BBC News. 6 April 2012.
  13. BirdLife International (2007a): [ 2006–2007 Red List status changes Archived 2008-09-14 at the Wayback Machine ]. Retrieved 26 August 2007.
  14. 1 2 Gill, Victoria (6 November 2009). "Quest to save world's rarest duck". BBC News. Retrieved 18 October 2014.
  15. Moore, Andy (6 April 2012). "World's rarest ducklings hatch in Madagascar". BBC News. Retrieved 18 October 2014.
  16. Gill, Victoria (6 April 2012). "World's rarest ducklings Madagascan pochards hatch". BBC News. Retrieved 18 October 2014.
  17. "Critically Endangered Madagascar pochard population has quadrupled". Wildlife Extra. March 2013. Archived from the original on 2018-10-01. Retrieved 2013-04-09.
  18. "Our Work in Madagascar". WWT. 21 September 2017.