Abstract
Plumage color is a composite trait and each component can provide information regarding individual quality. Melanin-based color is one of the most common plumage coloration in birds. This color comprises two types of melanin pigments: eumelanin (black pigment) and pheomelanin (yellow-reddish pigment), and it is affected by several post-molting processes such as UV damage, staining, and preen oils. In some birds, pheomelanin-based plumage color is related to several measures of sexual selection; however, pheomelanin is almost always expressed together with eumelanin and affected by post-molting processes. Therefore, it is still unclear whether (and to what extent) pheomelanin can explain the observed relationship between plumage color and the measure of sexual selection. Here we examined the melanin (both eumelanin and pheomelanin) concentration in relation to breeding onset, as a fitness component associated with sexual selection in male Barn Swallows (Hirundo rustica gutturalis). We found that throat feathers in males contained more pheomelanin than those in females. The amount of pheomelanin, but not eumelanin, declined throughout the sampling period, indicating that pheomelanin pigmentation conveys different information than eumelanin. Even after correcting for depigmentation of melanin, males with more pheomelanin bred earlier than the others. Together with the results from previous studies, these findings indicate that pheomelanin-based coloration may have evolved via sexual selection for pheomelanin pigmentation in Barn Swallows.
Zusammenfassung
Phäomelanin Pigmentierung bei männlichen Rauchschwalben ( Hirundo rustica gutturalis ) und Brutbeginn
Gefiederfärbung ist eine vielteilige Eigenschaft, und jede Komponente kann Informationen liefern über die Qualität eines Individuums. Melanin-Färbung ist eine der häufigsten Gefiederfärbungen bei Vögeln. Diese Farbe besteht aus zwei Typen des Melanin-Pigments: Eumelanin (schwarz) und Phäomelanin (gelb-rötlich), und unterliegt verschiedenen weiteren Veränderungen nach der Mauser, wie Schädigung durch UV-Strahlung, Schmutz und Bürzeldrüsenfett. Bei manchen Vögeln hängt eine Phäomelanin-Färbung zusammen mit verschiedenen Maßen der sexuellen Auslese; allerdings wird Phäomelanin fast immer zusammen mit Eumelanin gebildet und ist von Einwirkungen nach der Mauser betroffen. Daher ist es noch immer unklar, ob und inwieweit Phäomelanin die beobachteten Zusammenhänge zwischen Gefiederfärbung und den Maßen der sexuellen Auslese erklären kann. Hier untersuchten wir die Melaninkonzentration im Vergleich zum Brutbeginn als Fitness-Merkmal im Zusammenhang mit sexueller Auslese bei männlichen Rauchschwalben (Hirundo rustica gutturalis). Wir fanden, dass Kehlfedern bei Männchen mehr Phäomelanin enthielten als bei Weibchen. Die Menge an Phäomelanin, aber nicht Eumelanin, nahm über den Zeitraum der Untersuchung ab, was darauf hindeutet, dass die Phäomelanin-Färbung andere Informationen vermittelt als die Eumelanin-Färbung. Selbst nach einer Korrektur für die Entfärbung des Melanin, begannen Männchen mit mehr Phäomelanin früher mit dem Brüten. Zusammen mit Ergebnissen aus früheren Untersuchungen, deuten diese Erkenntnisse darauf hin, dass Phäomelanin-Färbung bei Rauchschwalben sich über sexuelle Selektion entwickelt haben könnten.
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Acknowledgments
We are grateful to the residents of Joetsu City for their kind support and assistance. We thank the members of the Department of Chemistry, School of Health Sciences, Fujita Health University, the Laboratory of Animal Ecology of Joetsu University of Education, the Laboratory of Ecology and Evolutionary Biology of Tohoku University and Innocence Plus English school. We also express our thanks to Shosuke Ito, Mamoru Watanabe and Yuma Takahashi for their useful suggestions.
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Communicated by K. C. Klasing.
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Arai, E., Hasegawa, M., Nakamura, M. et al. Male pheomelanin pigmentation and breeding onset in Barn Swallows Hirundo rustica gutturalis . J Ornithol 156, 419–427 (2015). https://doi.org/10.1007/s10336-014-1140-y
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DOI: https://doi.org/10.1007/s10336-014-1140-y