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Erythristic Eggs in the Common Tern (Eritrismo en Huevos de Sterna hirundo)

Helen Hays and Kenneth C. Parkes
Journal of Field Ornithology
Vol. 64, No. 3 (Summer, 1993), pp. 341-345
Published by: Wiley on behalf of Association of Field Ornithologists
Stable URL: http://www.jstor.org/stable/4513830
Page Count: 5
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Erythristic Eggs in the Common Tern (Eritrismo en Huevos de Sterna hirundo)
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Abstract

Erythrism, an abnormally reddish color, is known in the eggs of a few Laridae and Stercorariidae. It apparently results from the absence of one of the normal pigments and possibly an overdose of another. Erythrism in eggs of the Common Tern (Sterna hirundo) is exceedingly rare. Data from the long-term study of the large tern colony on Great Gull Island, New York, provide accurate information about relative frequency of the phenomenon and demonstrate its continuity in two females with changing mates. /// Se ha informado eritrismo (coloración rojiza anormal) en los huevos de algunas especies de Laridae y Stercorariidae. Esta condición parece ser el resultado de la ausencia de uno de los pigmentos normales y la sobreproducción de otro. El eritrismo es sumamente raro en huevos de Sterna hirundo. Datos tomados de un estudio a largo alcance en una colonia de estas gaviotas en Great Gull Island, New York, ha provisto de información precisa sobre la frecuencia de este fenómeno y ha demonstrado la continuidad del mismo en dos hembras que cambiaron de pareja.

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