Eye/Photophore Coordination and Light-following in Krill, Euphausia Superba

Eight of the 10 photophores of the Antarctic krill, Euphausia superba , are located at the ends of muscular stalks and exhibit coordinated orientation responses to incident white light; light emitted from the photophores is directed away from the incident light. Moreover, eye rotation occurs synchro...

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Main Authors: GRINNELL, A. D., NARINS, P. M., AWBREY, F. T., HAMNER, W. M., HAMNER, P. P.
Format: Text
Language:English
Published: Company of Biologists 1988
Subjects:
Online Access:http://jeb.biologists.org/cgi/content/short/134/1/61
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spelling fthighwire:oai:open-archive.highwire.org:jexbio:134/1/61 2023-05-15T13:38:16+02:00 Eye/Photophore Coordination and Light-following in Krill, Euphausia Superba GRINNELL, A. D. NARINS, P. M. AWBREY, F. T. HAMNER, W. M. HAMNER, P. P. 1988-01-01 00:00:00.0 text/html http://jeb.biologists.org/cgi/content/short/134/1/61 en eng Company of Biologists http://jeb.biologists.org/cgi/content/short/134/1/61 Copyright (C) 1988, Company of Biologists Journal Articles TEXT 1988 fthighwire 2015-02-28T18:04:09Z Eight of the 10 photophores of the Antarctic krill, Euphausia superba , are located at the ends of muscular stalks and exhibit coordinated orientation responses to incident white light; light emitted from the photophores is directed away from the incident light. Moreover, eye rotation occurs synchronously with photophore movement. Immobilization of one or both eyes eliminated the photophore light-following response in 40% of the trials, but in the remaining 60%, photophores continued to exhibit oriented, but less stable responses. In the presence of a stationary light source the eyes could be passively rotated without affecting photophore position. Furthermore, eye removal or covering the head with an opaque hood eliminated coordinated photophore movement. We conclude that vision is necessary for light-following responses by the photophores. In addition, the control signal for that movement is CNS-derived, may occur spontaneously or may be lightinduced, and appears to be accompanied by a parallel signal governing eye rotation. Subtle differences in photophore response when krill were oriented other than horizontally imply that krill may have a gravity sense that could help them orient in darkness. Text Antarc* Antarctic Antarctic Krill Euphausia superba HighWire Press (Stanford University) Antarctic The Antarctic
institution Open Polar
collection HighWire Press (Stanford University)
op_collection_id fthighwire
language English
topic Journal Articles
spellingShingle Journal Articles
GRINNELL, A. D.
NARINS, P. M.
AWBREY, F. T.
HAMNER, W. M.
HAMNER, P. P.
Eye/Photophore Coordination and Light-following in Krill, Euphausia Superba
topic_facet Journal Articles
description Eight of the 10 photophores of the Antarctic krill, Euphausia superba , are located at the ends of muscular stalks and exhibit coordinated orientation responses to incident white light; light emitted from the photophores is directed away from the incident light. Moreover, eye rotation occurs synchronously with photophore movement. Immobilization of one or both eyes eliminated the photophore light-following response in 40% of the trials, but in the remaining 60%, photophores continued to exhibit oriented, but less stable responses. In the presence of a stationary light source the eyes could be passively rotated without affecting photophore position. Furthermore, eye removal or covering the head with an opaque hood eliminated coordinated photophore movement. We conclude that vision is necessary for light-following responses by the photophores. In addition, the control signal for that movement is CNS-derived, may occur spontaneously or may be lightinduced, and appears to be accompanied by a parallel signal governing eye rotation. Subtle differences in photophore response when krill were oriented other than horizontally imply that krill may have a gravity sense that could help them orient in darkness.
format Text
author GRINNELL, A. D.
NARINS, P. M.
AWBREY, F. T.
HAMNER, W. M.
HAMNER, P. P.
author_facet GRINNELL, A. D.
NARINS, P. M.
AWBREY, F. T.
HAMNER, W. M.
HAMNER, P. P.
author_sort GRINNELL, A. D.
title Eye/Photophore Coordination and Light-following in Krill, Euphausia Superba
title_short Eye/Photophore Coordination and Light-following in Krill, Euphausia Superba
title_full Eye/Photophore Coordination and Light-following in Krill, Euphausia Superba
title_fullStr Eye/Photophore Coordination and Light-following in Krill, Euphausia Superba
title_full_unstemmed Eye/Photophore Coordination and Light-following in Krill, Euphausia Superba
title_sort eye/photophore coordination and light-following in krill, euphausia superba
publisher Company of Biologists
publishDate 1988
url http://jeb.biologists.org/cgi/content/short/134/1/61
geographic Antarctic
The Antarctic
geographic_facet Antarctic
The Antarctic
genre Antarc*
Antarctic
Antarctic Krill
Euphausia superba
genre_facet Antarc*
Antarctic
Antarctic Krill
Euphausia superba
op_relation http://jeb.biologists.org/cgi/content/short/134/1/61
op_rights Copyright (C) 1988, Company of Biologists
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