Colour Vision Genetics Learned from New World Monkeys in Santa Rosa, Costa Rica
By the mid-1980s, it was known that colour vision was polymorphic in New World monkeys due to allelic variation of the L/M opsin gene. However, until the early 2000s, it was unknown whether this polymorphism existed within social groups of wild monkeys, other than mixed-species troops of tamarins. In 2003, I embarked on a collaborative project with Linda Fedigan and colleagues in Santa Rosa National Park. We collected faecal samples from white-faced capuchin monkeys (Cebus capucinus) and black-handed spider monkeys (Ateles geoffroyi) that were individually identified by researchers. The major findings of our genetic studies were (1) the confirmation of the allelic polymorphism of the L/M opsin within social groups of each of the two species, (2) the discovery of a novel spectral tuning mechanism in ateline L/M alleles, (3) population genetic evidence for balancing selection on the L/M opsin alleles in the two species, (4) unequal allele frequencies of L/M opsins and (5) the discovery of hybrid L/M opsins in sympatric howler monkeys. Of equal importance has been the ecological side of our colour vision study. In this chapter I summarize basic knowledge on colour vision and visual opsin genes in primates and then describe the contribution of our studies in Santa Rosa to our understanding of primate colour vision evolution.
KeywordsColour vision Opsin Capuchin monkeys Spider monkeys Polymorphism
I cannot express my gratitude with words to Professor Linda Marie Fedigan. I simply thank my luck that I encountered Linda during my search for a field primatologist collaborator in the early 2000s. Without her assistance, guidance and cooperation, my research would have taken a very different path and reached no better place. I also thank from the bottom of my heart the many friends and excellent collaborators who I got to know through Linda, especially Amanda Melin and Chihiro Hiramatsu, for making the research so productive. I also greatly appreciate excellent suggestions in revising the manuscript from anonymous reviewers and the editors, Dr. Urs Kalbitzer and Dr. Katharine Jack.
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