 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
| . |  |
. |
Feather Color Is More Than Skin Deep
Barcelona, Spain (SPX) Apr 21, 2009 Where do birds get their red feathers from? According to Esther del Val, from the National History Museum in Barcelona, Spain, and her team, the red carotenoids that give the common crossbill (Loxia curvirostra) its red coloration are produced in the liver, not the skin, as previously thought. Their findings, published online in Springer's journal Naturwissenschaften, have implications for understanding the evolution of color signaling in bird species. Carotenoids have important physiological functions, including antioxidant, immunomodulating, and photoprotectant properties. Carotenoid pigments are also used by many bird species as colorants, and are responsible for most of their red, orange and yellow coloration. In particular, carotenoid-red coloration in birds has been shown to act as an ornament, signaling the nutritional and health status of the individual and its ability to locate high quality resources. Recent studies have suggested that the transformation of carotenoid pigments takes place directly in the follicles during feather growth. Del Val and her team show for the first time that, contrary to previous assumptions, the liver acts as the main site for the synthesis of carotenoids responsible for the birds' coloration, not the skin. The researchers examined the carotenoid content of the liver, blood, skin and feathers of seven common crossbills (finches) in which adult males display carotenoid-based coloration on the throat, breast and rump. They were particularly interested in the anatomical origin of the birds' red plumage. They found the primary red feather pigment of male crossbills in the birds' liver and blood, implying that the carotenoids are synthesized in the liver and then travel to the peripheral tissues via the bloodstream. Del Val concludes: "This surprising divergence with previous studies raises the question whether there are inter-specific differences in anatomical sites for conversion of carotenoids. Understanding inter-specific variation in mechanisms of color production may be the key to comprehend the different evolutionary pathways involved in color signaling." Reference(1). Del Val E et al (2009). The liver but not the skin is the site for conversion of a red carotenoid in a passerine bird. Naturwissenschaften DOI 10.1007/s00114-009-0534-9 Share This Article With Planet Earth
Related Links - Darwin Today At TerraDaily.com
Environmental group defends Canada's seal hunt
Montreal (AFP) March 11, 2009A Quebec environmental group on Wednesday called on the European Parliament not to ban seal products, saying it would hurt the Gulf of Saint Lawrence ecosystem and local communities. |
|
|
| The content herein, unless otherwise known to be public domain, are Copyright 1995-2007 - SpaceDaily.AFP and UPI Wire Stories are copyright Agence France-Presse and United Press International. ESA Portal Reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement,agreement or approval of any opinions, statements or information provided by SpaceDaily on any Web page published or hosted by SpaceDaily. Privacy Statement |
del.icio.us
Digg
Reddit
YahooMyWeb
Google
Facebook