. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. MANTIS SHRIMP SPECTRAL SENSITIVITY 315 100 50. 400 500 600 Wavelength (nm) 700 Figure 7. Solid line: average results of spectral scan experiments. Dotted line: computed absorptance spectrum for a rhodopsin having a 537-nm maximum and a peak absorbance of The dotted curve is normalized to its maximum, for comparison to the sensitivity function. nm) is about 25% broader than the 102-nm half band- width of the absorption spectrum of a rhodopsin in this spectral location (The absorption spectrum was calcu- lated using an 8t
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. MANTIS SHRIMP SPECTRAL SENSITIVITY 315 100 50. 400 500 600 Wavelength (nm) 700 Figure 7. Solid line: average results of spectral scan experiments. Dotted line: computed absorptance spectrum for a rhodopsin having a 537-nm maximum and a peak absorbance of The dotted curve is normalized to its maximum, for comparison to the sensitivity function. nm) is about 25% broader than the 102-nm half band- width of the absorption spectrum of a rhodopsin in this spectral location (The absorption spectrum was calcu- lated using an 8th-order polynomial developed by G. D. Bernard and kindly provided by him.) The discrepancy is easily resolved by considering self-screening by the rhodopsin, an effect that broadens the absorption func- tion. In Figure 7 the average curve generated by spectral scanning is plotted together with a computed absorption curve for a rhodopsin peaking at 537 nm and with a max- imum density of The match between the curves is excellent. In this ocular region, G. oerstedii has a sensitiv- ity maximum almost 20 nm to longer wavelengths than that of the squilloid, Squilla empiisa. which peaks at 520 nm (Trevino and Larimer, 1969). The techniques described here will now be applied to measure the spectral sensitivities of the various omma- tidial rows of the central band. Learning whether the sto- matopods possess the diversity of color receptors they seem capable of making will be a demanding, but excit- ing, task. Acknowledgments This material is based on work supported by the Na- tional Science Foundation under Grants No. BNS- 8311567 and BNS-8518769. N. J. Marshall read and cri- tiqued the manuscript. We thank G. Johnson and C. Tomlin for assistance with equipment design and fabri- cation, and G. D. Bernard for the use of his 8th-order cone polynomial. Literature Cited Bernard, G. D., and D. G. Stavenga. 1979. Spectral sensitivities of retinular cells measured in intact, living flie
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