Abstract
Rhabdom morphology in oplophorid shrimps varies both interspecifically and also within the eye of an individual, particularly with respect to the relative sizes of distal and proximal rhabdoms. We have combined published data on anatomical measurements, visual pigment absorption, and underwater light distribution to model the absorptance of light from different sources by the rhabdoms in these shrimps. In Systellaspis debilis the violet-sensitive distal rhabdom is prominent and increases in size along a dorso-ventral gradient. The model shows that the dorsal ommatidia are efficient at detecting downwelling irradiance and photophore emissions. In more ventral regions of the eye, the enlarged distal rhabdom results in the ommatidia in this region being more sensitive to eyeshine from other shrimps and to their bioluminescent secretions. This will improve the contrast of such light sources against the background space light. Acanthephyra pelagica has virtually no distal rhabdom and the model shows that this arrangement results in greater sensitivity.
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Acknowledgements
This work was supported by NERC grant GR3/11212. MSN gratefully acknowledges sabbatical support from Providence College. We would like to thank Justin Marshall (University of Queensland) for making available his data on the reflectance of carapace and tapetum of S. debilis. We thank Magnus Johnson for his valuable comments on an earlier draft of the manuscript.
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Communicated by J.P. Thorpe, Port Erin
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Gaten, E., Shelton, P.M.J. & Nowel, M.S. Contrast enhancement through structural variations in the rhabdoms of oplophorid shrimps. Marine Biology 145, 499–504 (2004). https://doi.org/10.1007/s00227-004-1338-2
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DOI: https://doi.org/10.1007/s00227-004-1338-2