Does cryptic dichromatism exist in the Saffron Finch(Sicalis flaveola)?Colorimetric variables and the avian visual model  

作　　者：Lorena Cruz-Bernate Camilo Espinosa-Bravo Hector Fabio Rivera-Gutierrez 

机构地区：[1]Ornithology and Animal Behavior Laboratory-OYCA,GEAHNA Group,Biology Department of the Natural and Exact Sciences Faculty,Universidad del Valle,Cali,Colombia [2]Ecology and Evolution Vertebrates Group,Biology Institute,Natural and Exact Sciences Faculty,Universidad de Antioquia,Medellín,Colombia

出　　处：《Avian Research》2023年第3期405-415,共11页鸟类学研究（英文版）

摘　　要：Sexual dichromatism,a particular type of sexual dimorphism,occurs in several species and has been associated with sexual selection.In some cases,the differences are so small that they are imperceptible to humans,but possibly detected by birds.The objective measurement of color with spectrophotometers and detailed analyses according to the perception ability of the avian eye have revealed that some species that were once considered to be monochromatic,are in fact dichromatic and able to perceive these differences.In the tropics,the Saffron Finch(Sicalis flaveola) does not present marked sexual dimorphism in coloration,which makes studies in behavioral ecology,natural history and population dynamics difficult.To assess whether there is dichromatism in the species,the reflectance(between 300 and 700 nm) of ten body regions was measured in 196 wild adults in Cali-Colombia.Sex was determined using the CHD1 gene on the sex chromosomes.Reflectance spectra were analyzed using:colorimetric variables and the avian visual model.We found that reflectance shows a bimodal curve in all body regions,except the crown.Males presented higher reflectance at long wavelengths,while for females this occurred in ultraviolet wavelengths.For the visual model,we found that there are significant intrasexual differences;however only in crown coloration is there a possible perceived difference between sexes.We conclude that in the Saffron Finch there are color differences between the sexes in all regions considering the physical phenomenon(reflectance),but in general,when evaluating color perception(avian visual model),there are no differences between the sexes in most of the body regions.The intrasexual differences are significant,indicating the possibility of these being signals that influence social interactions in the species.

关 键 词：Carotenoids Color discrimination Colombia Intrasexual signals Social selection Tanagers Tropical region 

分 类 号：Q958[生物学—动物学]