A strong case of dilution in the Yellow-throated Toucan (Ramphastos ambiguus)
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| Format: | Artículo científico |
| Language: | en |
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Sociedad para el Estudio y Conservación de las Aves en México A.C.
2020
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| _version_ | 1876434019626778624 |
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| author | José Manuel Mora |
| author_facet | José Manuel Mora |
| contents | A strong case of dilution in the Yellow-throated Toucan (Ramphastos ambiguus) José Manuel Mora Lucía I. López Umaña Veterinaria leucism Costa Rica Color aberration genetic mutation heritable disorders Plumage color aberrations are common in birds, but often it is difficult or even impossible to identify them properly in the field. Several of these aberrations are common, especially progressive greying, leucism and INO, although there is confusion among the different mechanisms. Other aberrations are rare or infrequently reported. Dilution, for example, refers to a reduced concentration of melanin granules that dilutes the color, although the pigment itself is not changed. It affects the entire plumage, rather than single feathers. The Yellow-throated Toucan (Ramphastos ambiguus) is predominantly black, and has feathers with brown tips, red under the tail coverts, and feathers above the tail are cream colored. It has a yellow bib covering the throat and chest with red band countering it, and the skin of the face is chartreuse. The Yellow-throated Toucan is most notable for its massive, bicolored bill. Here we report an apparent strong case of dilution in the Yellow-throated Toucan. An individual observed at La Unión, Guápiles on the Caribbean versant of Costa Rica on 10 October 2019 almost lacked melanin, but retained carotenoids. The tertials and some feathers on the rump were very light grey, suggesting strong dilution. We also discuss other possible explanations for this amazing coloration. 2020 artículo científico 1870-7459 https://www.redalyc.org/articulo.oa?id=75674977014 https://www.redalyc.org/journal/756/75674977014/ https://www.redalyc.org/journal/756/75674977014/html/ https://www.redalyc.org/journal/756/75674977014/75674977014.epub https://www.redalyc.org/journal/756/75674977014/movil 10.28947/hrmo.2020.21.2.511 en http://www.redalyc.org/revista.oa?id=756 Huitzil. Revista Mexicana de Ornitología application/pdf Sociedad para el Estudio y Conservación de las Aves en México A.C. Huitzil. Revista Mexicana de Ornitología (México) Num.2 Vol.21 |
| format | Artículo científico |
| id | redalyc_75674977014 |
| institution | Redalyc |
| language | en |
| publishDate | 2020 |
| publisher | Sociedad para el Estudio y Conservación de las Aves en México A.C. |
| spellingShingle | A strong case of dilution in the Yellow-throated Toucan (Ramphastos ambiguus) José Manuel Mora Veterinaria leucism Costa Rica Color aberration genetic mutation heritable disorders A strong case of dilution in the Yellow-throated Toucan (Ramphastos ambiguus) José Manuel Mora Lucía I. López Umaña Veterinaria leucism Costa Rica Color aberration genetic mutation heritable disorders Plumage color aberrations are common in birds, but often it is difficult or even impossible to identify them properly in the field. Several of these aberrations are common, especially progressive greying, leucism and INO, although there is confusion among the different mechanisms. Other aberrations are rare or infrequently reported. Dilution, for example, refers to a reduced concentration of melanin granules that dilutes the color, although the pigment itself is not changed. It affects the entire plumage, rather than single feathers. The Yellow-throated Toucan (Ramphastos ambiguus) is predominantly black, and has feathers with brown tips, red under the tail coverts, and feathers above the tail are cream colored. It has a yellow bib covering the throat and chest with red band countering it, and the skin of the face is chartreuse. The Yellow-throated Toucan is most notable for its massive, bicolored bill. Here we report an apparent strong case of dilution in the Yellow-throated Toucan. An individual observed at La Unión, Guápiles on the Caribbean versant of Costa Rica on 10 October 2019 almost lacked melanin, but retained carotenoids. The tertials and some feathers on the rump were very light grey, suggesting strong dilution. We also discuss other possible explanations for this amazing coloration. 2020 artículo científico 1870-7459 https://www.redalyc.org/articulo.oa?id=75674977014 https://www.redalyc.org/journal/756/75674977014/ https://www.redalyc.org/journal/756/75674977014/html/ https://www.redalyc.org/journal/756/75674977014/75674977014.epub https://www.redalyc.org/journal/756/75674977014/movil 10.28947/hrmo.2020.21.2.511 en http://www.redalyc.org/revista.oa?id=756 Huitzil. Revista Mexicana de Ornitología application/pdf Sociedad para el Estudio y Conservación de las Aves en México A.C. Huitzil. Revista Mexicana de Ornitología (México) Num.2 Vol.21 |
| title | A strong case of dilution in the Yellow-throated Toucan (Ramphastos ambiguus) |
| topic | Veterinaria leucism Costa Rica Color aberration genetic mutation heritable disorders |
| url | https://www.redalyc.org/articulo.oa?id=75674977014 https://www.redalyc.org/journal/756/75674977014/ https://www.redalyc.org/journal/756/75674977014/html/ https://www.redalyc.org/journal/756/75674977014/75674977014.epub https://www.redalyc.org/journal/756/75674977014/movil |