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Article
Miklós Laczi, Auteur ; Julia Balogh, Auteur ; Xavier Nardou, Auteur ; János Török, Auteur ; Gergely Hegyi, AuteurDans Ibis (163(2) 2021)White plumage areas are widespread among birds but the mechanisms generating individual differences in white feather reflectance are poorly known. Additionally, the proximate mechanisms of within-season feather colour changes in general are also[...]
Article
Miklós Laczi, Auteur ; Márton Herényi, Auteur ; Gergely Hegyi, Auteur ; János Török, AuteurAlbinism is a remarkably rare colour deficiency among natural populations of bird species. Here we document the first record of true albinism in a wild population of Collared Flycatchers Ficedula albicollis. We found a nest of two albino and thr[...]
Article
Gergely Hegyi, Auteur ; Miklós Laczi, Auteur ; Nora Boross, Auteur ; Monika Jablonszky, Auteur ; Dora Koetel, Auteur ; Katalin Krenhardt, Auteur ; Gabor Marko, Auteur ; Gergely Nagy, Auteur ; Balazs Rosivall, Auteur ; Eszter Szasz, Auteur ; Laszlo Zsolt Garamszegi, Auteur ; Janos Toeroek, AuteurSexually selected colour traits of bird plumage are widely studied. Although the plumage is replaced only at one or two yearly moults, plumage colour has long been shown to change between moults. Nevertheless, most studies measure colour weeks t[...]
Article
Dóra Kötél, Auteur ; Miklós Laczi, Auteur ; János Török, Auteur ; Gergely Hegyi, AuteurOne of the benefits of mate choice based on sexually selected traits is the greater investment of more ornamented individuals in parental care. The choosy individual can also adjust its parental investment to the sexual signals of its partner. I[...]
Article
Gergely Hegyi, Auteur ; János Török, AuteurYoung birds often face poor food Supply, which reduces their growth and development. However, if the shortage Of resources is only temporary, there is a possibility to adjust the growth trajectory of morphological traits after the end of the sho[...]
Article
Gergely Hegyi, Auteur ; Hubert Schwabl, AuteurAvian eggs contain variable levels of several maternal androgens that may all be important in adjusting offspring phenotype at the individual or brood level. Most studies have focused on experimental manipulations of testosterone (T), and the ot[...]
Article
Beata Szigeti, Auteur ; János Török, Auteur ; Gergely Hegyi, Auteur ; Balazs Rosivall, Auteur ; Rita Hargitai, Auteur ; Eszter Szollosi, Auteur ; Gabor Michl, AuteurComponents of avian egg quality often show remarkable variation between females and yet the causes of variation in this fitness-related trait remain poorly understood. We investigated the egg size and yolk carotenoid investment of blue tit Parus[...]
Article
Gergely Hegyi, Auteur ; Beata Szigeti, Auteur ; Janos Toeroek, Auteur ; Marcel Eens, AuteurThe importance of plumage colour as an indicator of individual quality and the basis of sexual selection has long been recognized. Of the three generally distinguished classes of plumage colours, melanin-based ornaments are traditionally conside[...]
Article
Rita Hargitai, Auteur ; Gergely Hegyi, Auteur ; Janos Toeroek, AuteurWinter body condition may play important roles in the life history of migratory birds, but it is difficult to estimate. We used the growth rate of winter-grown tail feathers of Collared Flycatchers Ficedula albicollis as an indicator of winter b[...]
