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Waveguide modes and pupil action in the eyes of butterflies

1990; Royal Society; Volume: 241; Issue: 1301 Linguagem: Inglês

10.1098/rspb.1990.0071

1471-2954

Michael F. Land, Daniel Osorio,

Visual perception and processing mechanisms

Restricted accessMoreSectionsView PDF ToolsAdd to favoritesDownload CitationsTrack Citations ShareShare onFacebookTwitterLinked InRedditEmail Cite this article Land Michael Francis and Osorio Daniel C. 1990Waveguide modes and pupil action in the eyes of butterfliesProc. R. Soc. Lond. B.24193–100http://doi.org/10.1098/rspb.1990.0071SectionRestricted accessArticleWaveguide modes and pupil action in the eyes of butterflies Michael Francis Land Google Scholar Find this author on PubMed Search for more papers by this author and Daniel C. Osorio Google Scholar Find this author on PubMed Search for more papers by this author Michael Francis Land Google Scholar Find this author on PubMed and Daniel C. Osorio Google Scholar Find this author on PubMed Published:22 August 1990https://doi.org/10.1098/rspb.1990.0071AbstractThe rhabdoms of the eyes of butterflies can support one, two, or more waveguide modes, depending on their diameter. The pupil mechanism consists of pigment granules that migrate towards the rhabdom in the light, and absorb the modal light that travels outside the rhabdom. Because there is relatively more extra-rhabdomal light in the higher-order modes, these are shed earlier and at lower light intensities, than the first mode. The effect of this is to reduce the acceptance angle of each ommatidium. We have measured the extent and timecourse of this change by both optical and electrophysiological methods. In small butterflies whose rhabdoms support only one mode there is no change. In Nymphalids such as Vanessa itea, where there are two modes, the reduction is by ca. 30% and in the crepuscular Satyrid Melanitis leda where three or more modes are present the reduction is almost 50%, from 2.9° to 1.5°. These pupil-induced acuity changes will occur towards the lower end of the range of environmental luminances seen by the butterfly during natural flight.FootnotesThis text was harvested from a scanned image of the original document using optical character recognition (OCR) software. As such, it may contain errors. Please contact the Royal Society if you find an error you would like to see corrected. Mathematical notations produced through Infty OCR. 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This Issue22 August 1990Volume 241Issue 1301 Article InformationDOI:https://doi.org/10.1098/rspb.1990.0071Published by:Royal SocietyPrint ISSN:0962-8452Online ISSN:1471-2954History: Manuscript received08/05/1990Manuscript accepted23/05/1990Published online01/01/1997Published in print22/08/1990 License:Scanned images copyright © 2017, Royal Society Citations and impact Large datasets are available through Proceedings B's partnership with Dryad