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dc.contributor.authorLessios, Nicolas
dc.contributor.authorRutowski, Ronald L.
dc.contributor.authorCohen, Jonathan H.
dc.contributor.authorSayre, Marcel E.
dc.contributor.authorStrausfeld, Nicholas J.
dc.date.accessioned2018-11-16T22:30:00Z
dc.date.available2018-11-16T22:30:00Z
dc.date.issued2018-05
dc.identifier.citationJournal of Experimental Biology (2018) 221, jeb165860. doi:10.1242/jeb.165860en_US
dc.identifier.issn0022-0949
dc.identifier.issn1477-9145
dc.identifier.pmid29622664
dc.identifier.doi10.1242/jeb.165860
dc.identifier.urihttp://hdl.handle.net/10150/631016
dc.description.abstractAnimals that have true color vision possess several spectral classes of photoreceptors. Pancrustaceans (Hexapoda+Crustacea) that integrate spectral information about their reconstructed visual world do so from photoreceptor terminals supplying their second optic neuropils, with subsequent participation of the third (lobula) and deeper centers (optic foci). Here, we describe experiments and correlative neural arrangements underlying convergent visual pathways in two species of branchiopod crustaceans that have to cope with a broad range of spectral ambience and illuminance in ephemeral pools, yet possess just two optic neuropils, the lamina and the optic tectum. Electroretinographic recordings and multimodel inference based on modeled spectral absorptance were used to identify the most likely number of spectral photoreceptor classes in their compound eyes. Recordings from the retina provide support for four color channels. Neuroanatomical observations resolve arrangements in their laminas that suggest signal summation at low light intensities, incorporating chromatic channels. Neuroanatomical observations demonstrate that spatial summation in the lamina of the two species are mediated by quite different mechanisms, both of which allow signals from several ommatidia to be pooled at single lamina monopolar cells. We propose that such summation provides sufficient signal for vision at intensities equivalent to those experienced by insects in terrestrial habitats under dim starlight. Our findings suggest that despite the absence of optic lobe neuropils necessary for spectral discrimination utilized by true color vision, four spectral photoreceptor classes have been maintained in Branchiopoda for vision at very low light intensities at variable ambient wavelengths that typify conditions in ephemeral freshwater habitats.en_US
dc.description.sponsorshipNational Science Foundation Graduate Research Fellowship [DGE-0802261]; National Institutes of Health IRACDA PERT fellowship through the Center for Insect Science [K12 GM000708]; University of Delaware Research Foundation [12A00755]; US Air Force Research Laboratory [FA8651-13-1-0001]en_US
dc.language.isoenen_US
dc.publisherCOMPANY BIOLOGISTS LTDen_US
dc.relation.urlhttp://jeb.biologists.org/lookup/doi/10.1242/jeb.165860en_US
dc.rights© 2018. Published by The Company of Biologists Ltd.en_US
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/
dc.subjectPancrustaceaen_US
dc.subjectBehavioren_US
dc.subjectColor visionen_US
dc.subjectElectroretinographyen_US
dc.subjectOpsinen_US
dc.titleMultiple spectral channels in branchiopods. I. Vision in dim light and neural correlatesen_US
dc.typeArticleen_US
dc.contributor.departmentUniv Arizona, Dept Neuroscien_US
dc.identifier.journalJOURNAL OF EXPERIMENTAL BIOLOGYen_US
dc.description.note12 month embargo; published online: 22 May 2018en_US
dc.description.collectioninformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.en_US
dc.eprint.versionFinal published versionen_US
dc.source.journaltitleThe Journal of Experimental Biology
dc.source.volume221
dc.source.issue10
dc.source.beginpagejeb165860


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