Download or read book Evolution of Visual Pigments in Passerine Birds: From Opsin Genes to Visual Pigment Function written by and published by . This book was released on 2014 with total page 147 pages. Available in PDF, EPUB and Kindle. Book excerpt: Overall, I found visual pigment spectral tuning evolves very slowly while regulation of opsin gene expression allows for fast adaptive evolution of the visual system in response to natural and sexual selection, and, in particular, sex-specific selection pressures.