bioRxiv preprint doi: https://doi.org/10.1101/2020.06.09.139766; this version posted June 10, 2020. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY-NC-ND 4.0 International license. Seeing Nemo: molecular evolution of ultraviolet visual opsins and spectral tuning of photoreceptors in anemonefishes (Amphiprioninae) Laurie J. Mitchell 1, Karen L. Cheney 1, Wen-Sung Chung 2, N. Justin Marshall 2, Kyle Michie 2, 3, Fabio Cortesi 2 1 School of Biological Sciences, The University of Queensland, Brisbane, QLD 4072, Australia 2 Queensland Brain Institute, The University of Queensland, Brisbane, QLD 4072, Australia 3 King’s College, Cambridge, CB2 1ST, UK *Corresponding authors:
[email protected],
[email protected] Keywords: Visual opsins, spectral tuning, reef fish vision, anemonefishes, ultraviolet, gene duplication Abstract Many animals can see short-wavelength or ultraviolet (UV) light (shorter than 400 nm) undetectable to human vision. UV vision may have functional importance in many taxa including for foraging and communication in birds, reptiles, insects and teleost fishes. Shallow coral reefs transmit a broad spectrum of light and are rich in UV; driving the evolution of diverse spectral sensitivities in teleost reef fishes, including UV-sensitivity. However, the identities and sites of the specific visual genes that underly vision in reef fishes remain elusive and are useful in determining how molecular evolution has tuned vision to meet the ecological demands of life on the reef.