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Documents disponibles écrits par cet auteur (11)
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Article
Henrik Brumm, Auteur ; Poyo Makomba, Auteur ; Wolfgang Goymann, AuteurBreeding behaviour is a key process for avian fitness and evolution, but the basic natural histories of many species are unknown. We studied the breeding biology of D’Arnaud’s Barbet Trachyphonus darnaudii (family Lybiidae) on the Usangu Plains [...]
Article
Christina Muck, Auteur ; Wolfgang Goymann, AuteurIn sex-role-reversed species, females are typically the more competitive sex, defending territories and access to mates, while males take care of the young, often without any help from the female. In males of species with traditional sex roles, [...]
Article
Sara Lupi, Auteur ; Ivan Maggini, Auteur ; Wolfgang Goymann, Auteur ; Massimiliano Cardinale, Auteur ; Alfonso Rojas Mora, Auteur ; Leonida Fusani, AuteurDuring migration, birds need to optimize their time and/or energy management, especially during stop-overs. Previous studies with caged birds under controlled condition support the notion that departure decisions are condition-dependent, but the[...]
Article
Henrik Brumm, Auteur ; Wolfgang Goymann, AuteurAvian duets have long fascinated biologists, but much remains unknown about what information may be contained in these collective displays and how duet structures vary between taxa. In this study, we describe the structure and performance rules [...]
Article
Sara Lupi, Auteur ; Wolfgang Goymann, Auteur ; Massimiliano Cardinale, Auteur ; Leonida Fusani, AuteurDuring migration, birds spend more than 80 % of the time at stopover sites to rest and refuel before and after crossing ecological barriers such as deserts or seas. Since stopover has intrinsic costs in terms of energy and time, birds should try[...]
Article
Sara Lupi, Auteur ; Wolfgang Goymann, Auteur ; Massimiliano Cardinale, Auteur ; Leonida Fusani, AuteurDuring migration, birds spend more than 80 % of the time at stopover sites to rest and refuel before and after crossing ecological barriers such as deserts or seas. Since stopover has intrinsic costs in terms of energy and time, birds should try[...]
Article
Megan M. Skrip, Auteur ; Ulf Bauchinger, Auteur ; Wolfgang Goymann, Auteur ; Leonida Fusani, Auteur ; Scott R. McWilliams, AuteurDuring migration, many songbirds encounter large ecological barriers, like deserts and seas that require substantial fuel to cross and can lead to dehydration during passage. If muscle is not catabolized to generate metabolic water, birds must s[...]
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Ralf Edler, Auteur ; Wolfgang Goymann, Auteur ; Ingrid Schwabl, Auteur ; Thomas W. P. Friedl, AuteurThe immunocompetence handicap hypothesis (ICHH) posits that the hormone testosterone mediates a trade-off between investment in reproduction and immunological condition. In this study, we tested the ICHH in the Red Bishop Euplectes orix, a polyg[...]
Article
Madeleine F. Scriba, Auteur ; Wolfgang Goymann, AuteurThe challenge hypothesis (Wingfield et al. in Am Nat 136:829-846, 1990) predicts that circulating testosterone increases when socially monogamous male birds are challenged during breeding. Although the challenge hypothesis has been confirmed in [...]
Article
Roland Frey, Auteur ; Wolfgang Goymann, AuteurIn many birds, the male reproductive tract is asymmetric with the left testis being larger than the right one. Coucals (Centropodidae) represent an exception as the asymmetry is typically reversed. Here, we describe the functional morphology of [...]
Article
Wolfgang Goymann, Auteur ; Meta M. Landys, AuteurPast studies have suggested a fundamental difference in testosterone concentrations between tropical and northern latitude male birds, with the convention being that males in the tropics express much lower levels of testosterone. However, recent[...]
