Visual Opsin Diversity in Sharks and Rays
| Autor: | Wayne I. L. Davies, Shaun P. Collin, Nicholas J. Hudson, Nathan S. Hart, Riccardo Natoli, Hardip R. Patel, David M. Hunt, Aaron Chuah, Scott C. Cutmore, Trevor D. Lamb |
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| Rok vydání: | 2019 |
| Předmět: |
Fish Proteins
0106 biological sciences Opsin genetic structures Color vision Prey detection Cone monochromacy Biology 010603 evolutionary biology 01 natural sciences Retina Predation 03 medical and health sciences Extant taxon Genetics Animals Skates Fish 14. Life underwater Molecular Biology Phylogeny Ecology Evolution Behavior and Systematics 030304 developmental biology Chromatic vision 0303 health sciences Color Vision Opsins Sequence Analysis RNA Gene Expression Profiling eye diseases Habitat Evolutionary biology Microspectrophotometry Retinal Cone Photoreceptor Cells Sharks sense organs |
| Zdroj: | Molecular Biology and Evolution. 37:811-827 |
| ISSN: | 1537-1719 0737-4038 |
| DOI: | 10.1093/molbev/msz269 |
| Popis: | The diversity of color vision systems found in extant vertebrates suggests that different evolutionary selection pressures have driven specializations in photoreceptor complement and visual pigment spectral tuning appropriate for an animal’s behavior, habitat, and life history. Aquatic vertebrates in particular show high variability in chromatic vision and have become important models for understanding the role of color vision in prey detection, predator avoidance, and social interactions. In this study, we examined the capacity for chromatic vision in elasmobranch fishes, a group that have received relatively little attention to date. We used microspectrophotometry to measure the spectral absorbance of the visual pigments in the outer segments of individual photoreceptors from several ray and shark species, and we sequenced the opsin mRNAs obtained from the retinas of the same species, as well as from additional elasmobranch species. We reveal the phylogenetically widespread occurrence of dichromatic color vision in rays based on two cone opsins, RH2 and LWS. We also confirm that all shark species studied to date appear to be cone monochromats but report that in different species the single cone opsin may be of either the LWS or the RH2 class. From this, we infer that cone monochromacy in sharks has evolved independently on multiple occasions. Together with earlier discoveries in secondarily aquatic marine mammals, this suggests that cone-based color vision may be of little use for large marine predators, such as sharks, pinnipeds, and cetaceans. |
| Databáze: | OpenAIRE |
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