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• W4310266413 abstract "Abstract Multibank retinas have rod photoreceptors stacked into multiple layers. They are found in many species of fish that inhabit dim environments and are one of the most common visual adaptations in the deep-sea. Despite its prevalence, the function of multibank retinas remained unknown. Two predominant theories, neither of which has been tested, have emerged: 1) they enhance sensitivity in dim light, and 2) they allow colour vision in dim light. To investigate the sensitivity hypothesis, we performed electrophysiological recordings and compared the rod pigments of three species of nocturnal reef fishes, two with a multibank retina ( Neoniphon sammara and Myripristis violacea ) and a control species with a single rod bank ( Ostorhinchus compressus ). Results indicated that nocturnal reef fishes with a multibank retina have higher temporal resolution of vision, as indicated by electrophysiology, and that their rhodopsin proteins likely also have faster retinal release kinetics, as suggested by amino acid substitutions. Electrophysiology also showed that the multibank retina conferred greater sensitivity to both dim and bright intensities than a single rod bank and this occurred at times when rod-derived signals usually dominate the visual response. This study provides the first functional evidence for enhanced dim-light sensitivity using a multibank retina while also suggesting novel roles for the adaptation in enhancing bright-light sensitivity and the speed of vision. Significance Most vertebrates have one layer of the dim-light active rod photoreceptors; however, some species have multiple layers, known as a multibank retina. We used electrophysiology on nocturnal reef fishes with and without multibank retinas to evaluate the sensory advantage of having multiple rod layers. We show that fish with multibank retinas have both faster vision and enhanced sensitivity to bright and dim light intensities. Thus, we resolve for the first time the function of multibank retinas – one of the most common visual adaptations in the deep sea. Our findings highlight an unconventional vertebrate visual system as well as the visual capabilities of fishes from the most vast (deep sea) and vibrant (reefs) ecosystems on the planet." @default.
• W4310266413 created "2022-11-30" @default.
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• W4310266413 date "2022-11-27" @default.
• W4310266413 modified "2023-09-26" @default.
• W4310266413 title "Multiple rod layers increase the speed and sensitivity of vision in nocturnal reef fishes" @default.
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• W4310266413 doi "https://doi.org/10.1101/2022.11.27.518067" @default.
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