The Colombian grebe (''Podiceps andinus''), was a

grebe 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. Some flightless species exist as well, most notably ...

found in the Bogotá wetlands on the

Bogotá savanna The Bogotá savanna is a montane savanna, located in the southwestern part of the Altiplano Cundiboyacense in the center of Colombia. The Bogotá savanna has an extent of and an average altitude of . The savanna is situated in the Eastern Ran ...

in the

Eastern Ranges The Eastern Ranges is an Australian rules football team in the NAB League, the Victorian statewide under-18s competition. The club is a founding member of the competition (1992) and has produced several players for the Australian Football Leag ...

of the

Andes The Andes, Andes Mountains or Andean Mountains (; ) are the longest continental mountain range in the world, forming a continuous highland along the western edge of South America. The range is long, wide (widest between 18°S – 20°S ...

of Colombia. The species was still abundant in

Lake Tota Lake Tota ( es, Lago de Tota) is the largest lake in Colombia, located in the east of Boyacá department, inside the Sugamuxi Province, it is the source of the Upia River which flows into the Orinoco River basin. The major town on the lake is A ...

in 1945. The species has occasionally been considered a subspecies of

black-necked grebe The black-necked grebe or eared grebe (''Podiceps nigricollis'') is a member of the grebe family of water birds. It was described in 1831 by Christian Ludwig Brehm. There are currently three accepted subspecies, including the nominate subspecie ...

(''P. nigricollis''). It was

flightless Flightless birds are birds that through evolution lost the ability to fly. There are over 60 extant species, including the well known ratites (ostriches, emu, cassowaries, rheas, and kiwi) and penguins. The smallest flightless bird is the ...

. The decline of the Colombian grebe is attributed to wetland drainage,

siltation Siltation, is water pollution caused by particulate Terrestrial ecoregion, terrestrial Clastic rock, clastic material, with a particle size dominated by silt or clay. It refers both to the increased concentration of suspended sediments and to the ...

, pesticide pollution, disruption by reed harvesting, hunting, competition, and predation of chicks by rainbow trout (''Oncorhynchus mykiss''). The primary reason was loss of habitat: drainage of wetlands and siltation resulted in higher concentrations of pollutants, causing

eutrophication Eutrophication is the process by which an entire body of water, or parts of it, becomes progressively enriched with minerals and nutrients, particularly nitrogen and phosphorus. It has also been defined as "nutrient-induced increase in phytopla ...

across

. This destroyed the open, submergent

pondweed Pondweed refers to many species and genera of aquatic plants and green algae: *''Potamogeton'', a diverse and worldwide genus *''Elodea'', found in North America *''Aponogeton'', in Africa, Asia and Australasia *''Groenlandia ''Groenlandia'' is ...

('' Potamogeton'') vegetation and resulted in the formation of a dense

monoculture In agriculture, monoculture is the practice of growing one crop species in a field at a time. Monoculture is widely used in intensive farming and in organic farming: both a 1,000-hectare/acre cornfield and a 10-ha/acre field of organic kale are ...

of water weed (''

Elodea ''Elodea'' is a genus of 6 species of aquatic plants often called the waterweeds described as a genus in 1803. Classified in the frog’s-bit family ( Hydrocharitaceae), ''Elodea'' is native to the Americas and is also widely used as aquarium ve ...

'').Varty et al. 1986, Fjeldsa 1993, as cited in O'Donnel and Fjeldsa 1997 By 1968, the species had declined to approximately 300 birds. Only two records of this bird were made in the 1970s; one seen 1972, and the last confirmed record from 1977 when three birds were seen. Intensive studies in 1981 and 1982 failed to find the species and it is now considered extinct.El Pato Zambullidor extinto de Colombia
/ref>

References

External links

Podiceps Podicipedidae Bird extinctions since 1500 Birds described in 1959 Taxa named by Rodolphe Meyer de Schauensee Extinct birds of South America Altiplano Cundiboyacense Species made extinct by human activities {{Podicipediformes-stub