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The decline and probable extinction of the Colombian Grebe Podiceps andinus

Published online by Cambridge University Press:  11 May 2010

J. Fjeldså
J. Fjeldså
Affiliation:
Zoological Museum, University of Copenhagen, Universitetsparken 15, DK-zioo Copenhagen, Denmark.
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Summary

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Searches were made for the Colombian Grebe Podiceps andinus in 1981 in the wetlands in the Eastern Andes of Colombia. The studies also included surveys of other waterbirds and recorded the general conditions of these wetlands, once the stronghold for waterbirds in the northern Andes. The Colombian Grebe was apparently last seen in 1977 in Lake Tota, and is probably extinct, although a flock may have been moving around outside Lake Tota and could have settled outside the former breeding area. The primary reason for the decline must be draining of wetlands and eutrophication and siltation which destroyed the open submergent Potamogeton vegetation, where this grebe may have been feeding on a large diversity of arthropods. Introduction of exotic fish and hunting may also have played a role.

Durante 1981 se han realizado varias expedidones en busca de Podiceps andinus en las zonas húmedas de los Andes Orientales de Colombia. Durante estos estudios también se censaron otras aves acuáticas y se tomaron notas sobre el estado general de éstas zonas húmedas, que en el pasado fueron el principal enclave para las aves acuáticas en los Andes del Norte. Aparentemente Podiceps andinus fué visto por última vez en 1977 en el Lago Tota, y está probablemente extinguido, aunque podría haber un bando en las inmediaciones de dicho lago que se hay a establecido fuera de la antigua área de cría. La razón fundamental del declive debe ser el drenaje de las zonas húmedas y la eutrofización y salinización que ha destruido la vegetatión sumergida de Potamogeton, donde ésta especie se alimentaba de una gran variedad de artrópodos. La introducción de peces exóticos y la caza pueden haber influido también.

Type
Research Article
Information
Bird Conservation International , Volume 3 , Issue 3 , September 1993 , pp. 221 - 234
Copyright
Copyright © Birdlife International 1993

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