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A new threat for the globally Endangered Hooded Grebe Podiceps gallardoi: the American mink Neovison vison.

  • IGNACIO ROESLER (a1), SANTIAGO IMBERTI (a2), HERNÁN CASAÑAS (a3) and NOELIA VOLPE (a3)
Summary
Summary

The Hooded Grebe Podiceps gallardoi has been uplisted to globally ‘Endangered’ recently mainly because of the rapid population decline suffered within the last 20 years due to factors such as nest depredation by Kelp Gull Larus dominicanus as well as destruction of colonies by wind and lake desiccation. During a census of Hooded Grebes during the 2010/2011 breeding season we found a new predator that has not previously been mentioned, the American mink Neovison vison. One individual mink killed 33 Hooded Grebes and consequently destroyed one of the five colonies found in that breeding season. Due to the characteristics of the waterbird assemblage in the area, the impact of mink could be catastrophic.

Resumen

El Macá Tobiano Podiceps gallardoi ha sido recientemente elevado a la categoría de globalmente ‘Amenazado’ debido a la rápida disminución poblacional sufrida en los últimos 20 años. Distintos factores fueron mencionados como posibles causas, como la depredación de nidos por la Gaviota Cocinera Larus dominicanus, destrucción de colonias por el viento, desecación de lagos y lagunas, etc. Durante la realización de censos en toda el área de distribución del Maca Tobiano en la temporada 2010/11 hallamos un nuevo depredador que nunca había sido mencionado como una posible amenaza, el Visón Americano Neovison vison. Solo un individuo de visón mató 33 adultos de Macá Tobiano y consecuentemente eliminó una de las cinco colonias halladas durante toda la temporada. Dadas las características de las comunidades de aves acuáticas de la zona el impacto de los visones puede llegar a producir una situación catastrófica.

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Corresponding author
*Author for correspondence; e-mail: kiniroesler@gmail.com
References
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Bird Conservation International
  • ISSN: 0959-2709
  • EISSN: 1474-0001
  • URL: /core/journals/bird-conservation-international
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