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Hybridization between the Scarlet Ibis (Eudocimus ruber) and the White Ibis (Eudocimus albus) in Venezuela

Cristina Ramo and Benjamin Busto
Colonial Waterbirds
Vol. 10, No. 1 (1987), pp. 111-114
Published by: Waterbird Society
DOI: 10.2307/1521240
Stable URL: http://www.jstor.org/stable/1521240
Page Count: 4
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Hybridization between the Scarlet Ibis (Eudocimus ruber) and the White Ibis (Eudocimus albus) in Venezuela
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Abstract

We have recorded 40 mixed pairs and observed 14 mixed copulations between Scarlet and White Ibises in the Venezuelan Llanos. Considering the largely separate distributional ranges of both birds, we propose that this bird is a single species composed of two subspecies: Eudocimus ruber ruber and E. ruber albus. A hybrid zone exists in Colombia and Venezuela, which time separates and connects the populations of White Ibis (North and Central America) and the Scarlet Ibis (Guianas and Brazil). In Venezuelan Llanos the White Ibis population accounts for less than 10% of the total of the two forms. /// Hasta la fecha se han registrado 40 parejas mixtas y observado 14 cópulas mixtas entre el Corocoro Rojo y Blanco en los Llanos de Venezuela. Considerando la distribución ampliamente separada de ambos corocoros, se propone la denominación de una sóla especie dividida en dos subespecies: Eudocimus ruber ruber y E. ruber albus, con una zona híbrida (Colombia y Venezuela) que al mismo tiempo separa y conecta la población de Corocoro Blanco (Norteamérica y Centroamérica) y de Corocoro Rojo (Guyanas y Brasil). En los Llanos de Venezuela el Corocoro Blanco no llega al 10% de la población total de corocoros.

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