Alaotra grebe

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Alaotra grebe
Conservation status
Extinct (2010)  (IUCN 3.1)[1]
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.

Description

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]

Diet

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]

Breeding

The breeding behavior of the Alaotra grebe was largely undocumented. Because

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

"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]

Gallery

• 
  An artist's reconstruction.

See also

• Atitlán grebe, extinct since 1989 for similar reasons
• Endemic birds of Madagascar and western Indian Ocean islands

References