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      Un raro caso de dilución pastel en Trogon elegans (Aves: Trogonidae) en la Reserva de la Biosfera El Cielo, México Translated title: A rare case of pastel dilution in Trogon elegans (Aves: Trogonidae) from Reserva de la Biosfera El Cielo, Mexico

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          Abstract

          Resumen Las coloraciones anormales en aves son raras y poco documentadas. Se han relacionado a problemas congénitos y con factores externos, consideradas como un indicador ambiental que da evidencia y pistas sobre la calidad de las poblaciones a nivel genético. Identificamos un caso de anormalidad pigmentaria en un trogón elegante (Trogon elegans (Gould, 1834)) en el Área Natural Protegida Reserva de la Biosfera El Cielo, México. Determinamos el tipo como dilución pastel, en esta mutación ambas melaninas se ven fuertemente afectadas, donde carecía de melanina, pero mantuvo los carotenoides con el rojo de las plumas ventrales. Discutimos posibles explicaciones para esta coloración anormal y asumimos que fueron alteraciones genéticas o de desarrollo del individuo las que causaron el decolorado del plumaje.

          Translated abstract

          Abstract The bird abnormal colorations are rare and poorly documented. They had been related to congenital problems and external factors, considered as an ambiental indicator that gives evidence and clues about the quality of the populations at a genetic level. We identified a pigmentary abnormalitycase on a Elegant Trogon (Trogon elegans (Gould, 1834)) in the natural protected area “Reserva de la Biosfera El Cielo”, Mexico. We determined the type as pastel dilution, on this mutation both melanin are greatly affected, where it lacked melanin, but it kept the carotenoids with the rd color on the ventral feathers. We discuss posible explanations for this abnormal coloration and asume that it was due to genetic or developmental alterations of the individual that caused the bleaching of the plumage.

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          Most cited references20

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          Albinism and phenotype of barn swallows (Hirundo rustica) from Chernobyl.

          The effects of mutation on phenotypic expression are supposed to be mainly deleterious because mutations disrupt the expression of genes that function relatively well under current environmental conditions. Thus, mutations are assumed to give rise to deviant phenotypes that are generally selected against. Radioactive contamination in the Chernobyl region of Ukraine is associated with a significant increase by a factor two to 10 in mutation rate in microsatellite markers of the barn swallow, Hirundo rustica. Barn swallows from Chernobyl had a temporally constant, elevated frequency of partial albinism compared to the situation before radioactive contamination and compared to birds from a control area. Albinism disproportionately affected the carotenoid-based plumage of the head, suggesting that carotenoid metabolism is particularly susceptible to the effects of radiation. Individuals with partially albinistic plumage had, on average, lower mean phenotypic values than other birds, and this was particularly the case for males. Furthermore, differences in phenotypic variation, as determined using Levene's test, were significantly larger in partial albinos compared to nonalbinos in males, but not in females, even though the null expectation would be the opposite due to the lower mean phenotypic values of partial albinos. Although small phenotypes were commonly associated with germline mutations, there was no general decrease in overall body size during the period 1991-2000, implying that small individuals were selected against. Because partial albinism is disfavored by natural selection, the effects of mutations are deleterious, giving rise to a balance between mutation and selection.
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            Partial albinism in a semi-isolated population of great reed warblers.

            Albinism in birds is thought to result from the expression of recessive alleles that disrupt melanin pigmentation at feather development. We have studied great reed warblers Acrocephalus arundinaceus in a recently founded and increasing population in Sweden during 15 years for the presence of birds with albinistic feathers. The study population was founded in 1978 and the few cases of albinism was exclusively recorded during the first five years of our study (1985-1989). This fits to the expected pattern if albinism is governed by recessive alleles; we have previously demonstrated that the population suffered from inbreeding during the first years of our study. The albinistic birds experienced a similar lifetime reproductive success as normally coloured birds.
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              YOU CAN'T JUDGE A PIGMENT BY ITS COLOR: CAROTENOID AND MELANIN CONTENT OF YELLOW AND BROWN FEATHERS IN SWALLOWS, BLUEBIRDS, PENGUINS, AND DOMESTIC CHICKENS

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                Author and article information

                Journal
                rpb
                Revista Peruana de Biología
                Rev. peru biol.
                Universidad Nacional Mayor de San Marcos. Facultad de Ciencias Biológicas (Lima, , Peru )
                1727-9933
                April 2022
                : 29
                : 2
                : e21854
                Affiliations
                [1] Tamaulipas Tamaulipas orgnameUniversidad Politécnica de Victoria Mexico
                Article
                S1727-99332022000200009 S1727-9933(22)02900200009
                10.15381/rpb.v29i2.21854
                d716285d-7bf6-4092-a801-2bb4cd768b69

                This work is licensed under a Creative Commons Attribution 4.0 International License.

                History
                : 29 April 2022
                : 03 January 2022
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 20, Pages: 0
                Product

                SciELO Peru

                Categories
                Notas Científicas

                Trogones,Eritrismo,Ezquizocroismo,carotenoides,anomalías en la pigmentación del plumaje,aberraciones cromáticas,chromatic aberration,Coa elegante,Trogons,Elegant trogon,Erythrism,Squizocroism,Carotenoids,Plumage pigment abnormalities

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