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| Content Provider | Springer Nature Link |
|---|---|
| Author | More, Juan Gil, Diego Cantarero, Alejandro López Arrabé, Jimena |
| Copyright Year | 2014 |
| Abstract | It is not clear at present if variation in testosterone (T) levels is associated with variation in plumage signal expression in female birds. In Iberian populations of Pied Flycatchers Ficedula hypoleuca, some females exhibit a distinctive white forehead patch similar to that found in males. Both sexes also exhibit conspicuous white patches on wings that vary greatly in size. Males show markedly larger wing patches. These patches are exhibited in social interactions. We have aimed at detecting if naturally occurring variation in T circulation is linked to the expression of forehead patch presence and folded wing white patch area in female Pied Flycatchers. There was marked variation in female plumage patches and in T levels. The area of the wing white patch but not the presence of a forehead patch in females was associated with higher circulating T levels during the incubation phase when controlling for female age and hatching success. Older females, and females suffering a reduced hatching success, also presented lower levels of T. Our study indicates that a female plumage trait that is equivalent to a sexually selected trait in males may signal T levels. Females, like males, may use plumage traits to signal their T-mediated aggressive disposition. Das Ausmaß eines weißen Gefiederflecks schwankt bei weiblichen Trauerschnäppern Ficedula hypoleuca mit dem Testosteronspiegel Derzeit ist unklar, ob Schwankungen im Testosteronspiegel mit Variationen in der Expression von Gefiedersignalen bei weiblichen Vögeln einhergehen. In iberischen Populationen des Trauerschnäppers Ficedula hypoleuca weisen manche Weibchen einen ausgeprägten weißen Stirnfleck auf, der dem der Männchen ähnlich ist. Beide Geschlechter haben außerdem auffällige weiße Flügelflecken, deren Größe sehr variabel ist. Die Flügelflecken der Männchen sind allerdings deutlich größer. Diese Flecken werden bei sozialen Interaktionen präsentiert. Wir haben versucht herauszufinden, ob natürlich auftretende Schwankungen des im Blut zirkulierenden Testosterons bei weiblichen Trauerschnäppern mit der Expression der Stirn- und Flügelflecken zusammenhängen. Flecken und Testosteronspiegel der Weibchen variierten deutlich. Die Fläche des weißen Flügelflecks, jedoch nicht das Vorhandensein des Stirnflecks, hing mit einem höheren Spiegel zirkulierenden Testosterons während der Bebrütungsphase zusammen, wenn Alter der Weibchen und Schlupferfolg im statistischen Modell berücksichtigt wurden. Ältere Weibchen und solche mit reduziertem Schlupferfolg hatten niedrigere Testosteronspiegel. Unsere Studie deutet darauf hin, dass ein weibliches Gefiedermerkmal, das gleichbedeutend mit einem sexuell selektierten Merkmal der Männchen ist, den Testosteronspiegel anzeigen könnte. Weibchen könnten genau wie Männchen Gefiedermerkmale nutzen, um ihre durch Testosteron vermittelte aggressive Neigung zu signalisieren. |
| Starting Page | 639 |
| Ending Page | 648 |
| Page Count | 10 |
| File Format | |
| ISSN | 21937192 |
| Journal | Journal für Ornithologie |
| Volume Number | 155 |
| Issue Number | 3 |
| e-ISSN | 21937206 |
| Language | English |
| Publisher | Springer Berlin Heidelberg |
| Publisher Date | 2014-02-06 |
| Publisher Place | Berlin, Heidelberg |
| Access Restriction | Subscribed |
| Subject Keyword | Female signals Female–female competition Female ornaments Hormonal senescence Social selection Zoology Animal Ecology Evolutionary Biology |
| Content Type | Text |
| Resource Type | Article |
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