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Article
Spectral Sensitivity, Visual Pigments and Screening Pigments in Two Life History Stages of the Ontogenetic Migrator Gnathophausia ingens
Journal of the Marine Biological Association of the United Kingdom
  • Tamara M. Frank, Harbor Branch Oceanographic Institution
  • Megan Porter, University of Maryland - Baltimore County
  • Thomas W. Cronin, University of Maryland - Baltimore County
Document Type
Article
Publication Date
2-1-2009
Keywords
  • Deep-sea,
  • Visual ecology,
  • Crustacean
Peer Reviewed
1
Abstract
Spectral sensitivity, visual pigment absorbance spectra and visual pigment opsin sequences were examined in younger shallow-living and older deep-living instars of the ontogenetically migrating lophogastrid Gnathophausia ingens. Spectral sensitivity measurements from dark adapted eyes and microspectrophotometric measurements of the rhabdom indicate maximal sensitivity for long wavelength (495-502 nm) light in both life history stages, but the younger instars are significantly more sensitive to near-ultraviolet light than the adults. Both life history stages express the same two opsins, indicating that there is no ontogenetic change in visual pigment complement between life history stages. Chromatic adaptation shifted the spectral sensitivity maximum to significantly longer wavelengths in both age-classes, but a distinct secondary short wavelength peak is visible only in the younger instars. These shifts appear to be due to the presence of migrating screening pigments, which are probably vestigial in the deep-living adults. Anomalies in the response waveforms under chromatic adaptation also apparently result from filtering by screening pigments, but via an unknown mechanism.
Comments

©2009 Marine Biological Association of the United Kingdom

Additional Comments

National Science Foundation grant #s: IBN-0343871, IBN-0235820

DOI
10.1017/S0025315408002440
Citation Information
Tamara M. Frank, Megan Porter and Thomas W. Cronin. "Spectral Sensitivity, Visual Pigments and Screening Pigments in Two Life History Stages of the Ontogenetic Migrator Gnathophausia ingens" Journal of the Marine Biological Association of the United Kingdom Vol. 89 Iss. 1 (2009) p. 119 - 129 ISSN: 0025-3154
Available at: http://works.bepress.com/tamara-frank/37/