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Documents disponibles écrits par cet auteur (11)
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Article
Anthony D. Fox, Auteur ; Henning Heldbjerg, Auteur ; Kevin K. Clausen, Auteur ; Ole R. Therkildsen, Auteur ; Qingshan Zhao, Auteur ; Juan J. Negro, Auteur ; Andy J. Green, AuteurDans Wildfowl (73 2023)Four adult female Greylag Geese Anser anser tagged with GPS/GSM tracking devices in East Jutland, Denmark migrated to spend the winter of 2021/22 in Coto Doñana, southern Spain. Regular 10-min GPS positions confirmed that three out of the four b[...]
Article
Carlos Camacho, Auteur ; Juan J. Negro, Auteur ; Johan Elmberg, Auteur ; Anthony D. Fox, Auteur ; Szabolcs Nagy, Auteur ; Deborah J. Pain, Auteur ; Andy J. Green, Auteur
Article
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[...]
Article
Luis Cadahia, Auteur ; Vicente Urios, Auteur ; Juan J. Negro, Auteur
Article
Airam Rodriguez, Auteur ; Juan J. Negro, Auteur ; James W. Fox, Auteur ; Vsevolod Afanasyev, AuteurLight level geolocators, also known as GLS loggers, are electronic devices intended for tracking the location of wide-ranging animals using ambient light to estimate latitude and longitude. Miniaturized geolocators that can be used on relatively[...]
Article
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 [...]
Article
Luis Cadahia, Auteur ; Pascual López-López, Auteur ; Vicente Urios, Auteur ; Juan J. Negro, Auteur
Article
Luis Cadahia, Auteur ; Juan J. Negro, Auteur ; Vicente Urios, AuteurThis study is an initial survey of the genetic diversity and population structure of the endangered Bonelli's Eagle (Hieraaetus fasciatus) in SW Europe (Iberia) and NW Africa, two locations where the species has undergone a severe decrease in nu[...]
Article
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[...]
Article
Miguel Alcaide, Auteur ; David Serrano, Auteur ; José L. Tella, Auteur ; Juan J. Negro, AuteurThe integration of capture-recapture and molecular approaches can improve our understanding of the consequences of habitat fragmentation on population connectivity. Here we employed microsatellites to test dispersal hypotheses derived from inten[...]
Article
Juan J. Negro, AuteurTwo independent cases of visual mimicry involving snake-eating eagles as mimics and more powerful bird-eating hawks as models are proposed. One pair of species is formed by the sympatric West African Serpent-eagle Dryotriorchis spectabilis and C[...]
