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Documents disponibles écrits par cet auteur (14)
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Article
Sol Rodríguez-Martínez, Auteur ; Olafur Arnalds, Auteur ; Jón Guðmundsson, Auteur ; María Svavarsdóttir, Auteur ; Fanney Ó. Gísladóttir, Auteur ; Ólafur K. Nielsen, Auteur ; Ismael Galvan, AuteurMelanins are the most common pigments in birds and mammals. The synthesis of the sulfurated form of melanin, termed pheomelanin, is promoted by high levels of thiols in melanocytes. Exposure to elemental sulfur in the environment can potentially[...]
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Ismael Galvan, Auteur ; Sol Rodríguez‐Martínez, AuteurSexual selection can drive the evolution of phenotypic traits because of female preferences for exaggerated trait expression in males. Sexual selection can also lead to the evolutionary loss of traits, a process to which female preferences for d[...]
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Juan J. Negro, Auteur ; Enrique Figueroa‐Luque, Auteur ; Ismael Galvan, AuteurMelanins are the most common pigments providing coloration in the plumage and bare skin of birds and other vertebrates. Numerous species are dichromatic in the adult or definitive plumage, but the direction of this type of sexual dichromatism (i[...]
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Gary R. Bortolotti, Auteur ; Marten J. Stoffel, Auteur ; Ismael Galvan, AuteurFor a comprehensive understanding of the evolution of animal signals, it is necessary to understand how the performance of visual displays is maximized to get the most possible attention from receivers. We assessed whether the white plumage of S[...]
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Ismael Galvan, Auteur ; Rob G. Bijlsma, Auteur ; Juan J. Negro, Auteur ; Manuel Jaren, Auteur ; Juan Garrido-Fernandez, AuteurAlthough it is recognized that certain environmental factors are important determinants of the expression of melanin-based traits, their influence in wild populations of animals is poorly known. One of these factors is the availability of amino [...]
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Ismael Galvan, AuteurFeather microstructure affects the light absorbed by plumage pigments. However, the effect of particular elements of feather microstructure on the expression of pigmentary colours or on the size of colour patches has never been investigated. Her[...]
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Ismael Galvan, Auteur ; Juan J. Sanz, AuteurPlumicolous feather mites are ectosymbiotic organisms that live on bird feathers. Despite their abundance and prevalence among birds, the ecology of the interaction between these organisms and their hosts is poorly known. As feather mites feed o[...]
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Ismael Galvan, Auteur ; Eduardo Aguilera, Auteur ; Francisco Atienzar, Auteur ; Emilio Barba, Auteur ; Guillermo Blanco, Auteur ; Jose L. Canto, Auteur ; Veronica Cortes, Auteur ; Oscar Frias, Auteur ; Istvan Kovacs, Auteur ; Leandro Melendez, Auteur ; Anders P. Moller, Auteur ; Juan S. Monrós, Auteur ; Péter L. Pap, Auteur ; Ruben Piculo, Auteur ; Juan C. Senar, Auteur ; David Serrano, Auteur ; José L. Tella, Auteur ; Csongor I. Vágási, Auteur ; Matthias Voegeli, Auteur ; Roger Jovani, AuteurFeather mites are arthropods that live on or in the feathers of birds, and are among the commonest avian ectosymbionts. However, the nature of the ecological interaction between feather mites and birds remains unclear, some studies reporting neg[...]
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Ismael Galvan, Auteur ; Juan Jose Sanz, Auteur
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Ismael Galvan, AuteurThe evolution of multiple signals can be explained because they enhance the perception of a general message by recipients. Plumage coloration frequently acts as a condition-dependent signal, so that species displaying different colour patches ha[...]
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Ismael Galvan, Auteur ; Juan J. Negro, Auteur ; Gary R. Bortolotti, Auteur ; Antoni Margalida, AuteurWe report for the first time the existence of a structural mechanism of feathers different from iridescence that makes plumage conspicuous. By using electron and light microscopy, we show that the mechanism consists of special lengthened and twi[...]
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Ismael Galvan, AuteurThe expression of structural plumage colours (i.e. those generated by feather microstructures) often acts as a signal of quality, but the signal content of these traits remains relatively unknown. However, a hypothesis posits that the production[...]
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Ismael Galvan, Auteur ; Luisa Amo, Auteur ; Juan J. Sanz, AuteurThe colouration exhibited by nestling birds is generally cryptic, but in some species it has a conspicuous appearance. The adaptive function of these nestling displays is poorly known, especially in altricial species. We performed an experimenta[...]
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Ismael Galvan, Auteur ; Juan Moreno, AuteurIt has been proposed that mate preferences by female Pied Flycatchers Ficedula hypoleuca differ between southern (Iberian) and northern (Scandinavian) European populations. Whereas the size of the white forehead patch, but not plumage colour, ha[...]
