Skip to main content

IMIS

A new integrated search interface will become available in the next phase of marineinfo.org.
For the time being, please use IMIS to search available data

 

[ report an error in this record ]basket (0): add | show Print this page

Keratin nanofiber distribution and feather microstructure in penguins
Kulp, F.B.; D'Alba, L.; Shawkey, M.D.; Clarke, J.A. (2018). Keratin nanofiber distribution and feather microstructure in penguins. The Auk 135(3): 777-787. https://dx.doi.org/10.1642/AUK-18-2.1
In: The Auk: A quarterly journal of ornithology. The American Ornithologists' Union: Washington, D.C.. ISSN 0004-8038; e-ISSN 1938-4254, more
Peer reviewed article  

Available in  Authors 

Keyword
Author keywords
    nanofibers; Sphenisciformes; structural color

Authors  Top 
  • Kulp, F.B.
  • D'Alba, L., more
  • Shawkey, M.D., more
  • Clarke, J.A.

Abstract
    Penguins exhibit an array of derived feather features and color-producing mechanisms, including distinct melanosome morphologies and beta-keratin nanofibers that produce blue structural color. Several morphologies have been proposed to have hydrodynamic or insulatory functions. An understanding of the distribution of these morphologies over the body of a single penguin species may elucidate their evolution and function. We investigated feather microstructure and color production mechanisms in blue, black, and white barbs of feathers of the Gentoo Penguin (Pygoscelis papua). Light and scanning electron microscopy revealed that all feathers, regardless of color, are semi-lunate in cross section and lack, or show greatly reduced, air-filled compartments (central vacuoles) in feather barbs. Keratin nanofibers are present in all sampled feathers (including those of 8 other penguin species) but are surrounded by melanin in black barbs and disorganized in white barbs. Reduction of the air-filled central vacuole and gain of keratin nanofibers appear to have single origins in penguins. Given that they occur in all feathers regardless of color, we hypothesize that nanofibers have been co-opted for color production but initially arose for another function.

All data in the Integrated Marine Information System (IMIS) is subject to the VLIZ privacy policy Top | Authors