Melanin Concentration Gradients in Modern and Fossil Feathers

Authors

Daniel J. Field, Yale UniversityFollow
Liliana D’Alba, University of AkronFollow
Jakob Vinther, Bristol UniversityFollow
Samuel M. Webb, Stanford Linear Accelerator CenterFollow
William Gearty, University of Nebraska - LincolnFollow
Matthew D. Shawkey, Ghent UniversityFollow

Document Type

Article

Date of this Version

3-26-2013

Citation

Field DJ, D’Alba L, Vinther J, Webb SM, Gearty W, et al. (2013) Melanin Concentration Gradients in Modern and Fossil Feathers. PLoS ONE 8(3): e59451.

doi:10.1371/journal.pone.0059451

Comments

Copyright 2013 Field et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License

Abstract

In birds and feathered non-avian dinosaurs, within-feather pigmentation patterns range from discrete spots and stripes to more subtle patterns, but the latter remain largely unstudied. A ,55 million year old fossil contour feather with a dark distal tip grading into a lighter base was recovered from the Fur Formation in Denmark. SEM and synchrotron-based trace metal mapping confirmed that this gradient was caused by differential concentration of melanin. To assess the potential ecological and phylogenetic prevalence of this pattern, we evaluated 321 modern samples from 18 orders within Aves. We observed that the pattern was found most frequently in distantly related groups that share aquatic ecologies (e.g. waterfowl Anseriformes, penguins Sphenisciformes), suggesting a potential adaptive function with ancient origins.