. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 276 T. M. FRANK AND J. F. CASE , 340 420 *60 520 HO 640 Wavelength (nm). 140 400 440 MO 550 «« Wavelength (nm) 340 400 4M 570 MO 140 Wavelength (nm) Figure 2. Effects of chromatic adaptation on the shape of the spec- sensinviu curve. Standard errors are shown in Figure 3. Values from indis idual experiments were normali/ed before combining data. (A) Average violet adapted curve (n - 1 1—dotted line) superimposed on the dark-adapted curve (solid linei. displavstwosensitivitv maxima at 450 and 550 nm. (B) The effects of g
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 276 T. M. FRANK AND J. F. CASE , 340 420 *60 520 HO 640 Wavelength (nm). 140 400 440 MO 550 «« Wavelength (nm) 340 400 4M 570 MO 140 Wavelength (nm) Figure 2. Effects of chromatic adaptation on the shape of the spec- sensinviu curve. Standard errors are shown in Figure 3. Values from indis idual experiments were normali/ed before combining data. (A) Average violet adapted curve (n - 1 1—dotted line) superimposed on the dark-adapted curve (solid linei. displavstwosensitivitv maxima at 450 and 550 nm. (B) The effects of green adaptation In "I were similar, but a short wavelength shoulder rather than a distinct peak was present. (C)Orange adaptation (n = 9) had no visible effect on the shape of the spectral sensitivity curve. adapting light had a statistically significant etVect on the shape of the spectral sensitivity cur\ c. Results Spectral sensitivity Spectral sensitivity curves were measured at criterion response amplitudes ranging from 20 ^V to .5 mV. Be- cause spectral sensitivity at all response levels was identi- cal, only results obtained using the smallest criterion re- sponses (from 20-80 n\) are presented, because more complete chromatically adapted curves were measured at these amplitudes. Maximum sensitivity of dark-adapted eyes was at about 510 nm and the spectral sensitivity curve was much broader than those previously published for other crustaceans (see Fig. 2—data displayed on log scale for comparison with other published spectra). The shape of the curve is fairly well approximated by the absorptance spectrum of a single pigment present in a very high con- centration ( = —Fig. I A) or hv an absorptance spectrum arising from the presence of two pigments ab- sorbing maximally at 490 and 520 nm (Fig. IB). Violet and green light adaptation altered the shape of the spectral sensitivity curve, but not in a manner consis- tent with a dual \ isual pigment system.
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