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Ring recoveries of dead birds confirm that darker pheomelanic Barn Owls disperse longer distances

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Abstract

Variation in melanin coloration is widespread and often associated with other phenotypic traits. A recent study showed that darker-reddish pheomelanic Barn Owls (Tyto alba) move longer distances between birth and breeding sites. Because this study considered only individuals recovered within a limited study area, it remains unclear whether the association between melanism and dispersal applies to a larger geographic scale. I analysed an independent dataset of birds ringed in the same study area but recovered dead along roads within and outside this area. As expected, dark pheomelanic owls dispersed further than lighter reddish conspecifics at a larger spatial scale.

Zusammenfassung

Totfunde beringter Vögel bestätigen, dass dunklere, pheomelanistische Schleiereulen weiter abwandern. Variationen in der Melaninfärbung sind weit verbreitet und oft mit anderen Merkmalen verknüpft. Kürzlich zeigte eine Studie, dass dunkler rot gefärbte Schleiereulen (Tyto alba), eine Färbung hervorgerufen durch Pheomelanin, längere Distanzen zwischen dem Ort an dem sie aufgezogen wurden und dem Brutplatz zurücklegen. Da diese Studie nur Individuen innerhalb eines bestimmten Versuchsgebiets berücksichtigen konnte, blieb es unklar, ob die Verknüpfung zwischen Melanismus und Abwanderung auch für größere geographische Maßstäbe gilt. Deshalb wurde ein unabhängiger Datensatz von Vögeln analysiert, die im gleichen Gebiet beringt worden waren, aber innerhalb und außerhalb diesen Gebiets entlang von Straßen tot wieder gefunden wurden. Wie erwartet, wanderten dunklere, pheomelanistische Eulen auch in diesem größeren Maßstab weiter ab als ihre helleren Artgenossen.

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Acknowledgments

I thank a number of people that helped me in the field to ring birds and measure coloration, namely Henri Etter, the late Martin Epars, Isabelle Henry and Bettina Almasi. I am indebted to the Swiss Ornithological Station of Sempach for having collected and shared the data on ring recoveries, the Swiss National Science Foundation for having granted this study (grant no. 31003A_120517), and Reto Burri and an anonymous reviewer for useful comments.

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Correspondence to Alexandre Roulin.

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Communicated by F. Bairlein.

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Roulin, A. Ring recoveries of dead birds confirm that darker pheomelanic Barn Owls disperse longer distances. J Ornithol 154, 871–874 (2013). https://doi.org/10.1007/s10336-013-0949-0

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