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• W789838391 abstract "Event Abstract Back to Event Eyes and vision in a mesopelagic copepod Jonathan H. Cohen1* and Tamara M. Frank2 1 Univeristy of Delaware, College of Earth, Ocean, and Environment, United States 2 Nova Southeastern University, Oceanographic Center and Farquhar College of Arts & Sciences, United States Mesopelagic animals have a striking diversity of adaptations for vision in their dim habitat, and these have been investigated in most detail for chamber-eyed fish and compound-eyed crustaceans. Far less is known about the visual capabilities of mesopelagic species with naupliar eyes, including the abundant and ecologically important copepods. Here we present data on both the structure and function of the visual system in the metridinid copepod Gaussia princeps. This species is a vertical migrator, typically residing in oxygen minimum zones during the day and ascending into shallower (and warmer) waters at night to feed. We used (1) light and electron microscopy to describe the tripartite naupliar eye, (2) electroretinography to characterize temporal and spectral aspects of vision, and (3) contrast ratio modeling to evaluate the tuning of its spectral sensitivity for bioluminescence detection. The G. princeps eye is highly sensitive to light with 10.07 log photons cm-2 s-1 evoking half-maximum response amplitude in the VlogI curve. This sensitivity is due in part to slow photoreceptor dynamics; maximum critical flicker fusion frequencies are 7.2 – 12.0 Hz over the temperature range G. princeps experiences during its diel vertical migrations. Temporal resolution is moderately temperature sensitive (Q10 = 2.12 – 2.55), but insensitive to light adaptation. The spectral sensitivity functions in dark- and chromatic-adapted G. princeps eyes predict a single visual pigment at 496 nm. Gaussia princeps spectral sensitivity was better fit to its own luminescence emission spectrum than to the luminescence spectra of other representative mesopelagic species due to the presence of increased emission at wavelengths >500 nm in the G. princeps luminescence spectra. A signal:noise model supported that the observed G. princeps spectral sensitivity, which is offset to longer wavelengths relative to downwelling light, would serve to increase spectral contrast when viewing its luminescence against background mesopelagic light. Collectively, these data suggest the tripartite naupliar eye of G. princeps is well-adapted for vision in mesopelagic habitats, with slow photoreceptor dynamics and concomitant sensitivity, as well as spectral tuning for luminescence detection. Figure 1 Keywords: deep-sea, Spectral sensitivity, Electroretinography, temporal resolution, bioluminescence Conference: International Conference on Invertebrate Vision, Fjälkinge, Sweden, 1 Aug - 8 Aug, 2013. Presentation Type: Oral presentation preferred Topic: Eye design, optics and spatial vision Citation: Cohen JH and Frank TM (2019). Eyes and vision in a mesopelagic copepod. Front. Physiol. Conference Abstract: International Conference on Invertebrate Vision. doi: 10.3389/conf.fphys.2013.25.00036 Copyright: The abstracts in this collection have not been subject to any Frontiers peer review or checks, and are not endorsed by Frontiers. They are made available through the Frontiers publishing platform as a service to conference organizers and presenters. The copyright in the individual abstracts is owned by the author of each abstract or his/her employer unless otherwise stated. Each abstract, as well as the collection of abstracts, are published under a Creative Commons CC-BY 4.0 (attribution) licence (https://creativecommons.org/licenses/by/4.0/) and may thus be reproduced, translated, adapted and be the subject of derivative works provided the authors and Frontiers are attributed. For Frontiers’ terms and conditions please see https://www.frontiersin.org/legal/terms-and-conditions. Received: 24 Feb 2013; Published Online: 09 Dec 2019. * Correspondence: Dr. Jonathan H Cohen, Univeristy of Delaware, College of Earth, Ocean, and Environment, Lewes, DE, 19958, United States, jhcohen@udel.edu Login Required This action requires you to be registered with Frontiers and logged in. To register or login click here. Abstract Info Abstract The Authors in Frontiers Jonathan H Cohen Tamara M Frank Google Jonathan H Cohen Tamara M Frank Google Scholar Jonathan H Cohen Tamara M Frank PubMed Jonathan H Cohen Tamara M Frank Related Article in Frontiers Google Scholar PubMed Abstract Close Back to top Javascript is disabled. Please enable Javascript in your browser settings in order to see all the content on this page." @default.
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• W789838391 title "Eyes and vision in a mesopelagic copepod" @default.
• W789838391 doi "https://doi.org/10.3389/conf.fphys.2013.25.00036" @default.
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