. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 360 420 430 540 600 Wavelength (nm) 360 420 480 540 600 Wavelength (nm) Figure 1. Solid line shows dark-adapted mean spectral sensitivity curve for Gnathophausia ingens (n = 25). Sensitivity is defined as the reciprocal of the relative number of quanta required to elicit a criterion response at each wavelength. Criterion responses were from 20 to 50 jiV. Values from individual experiments were normalized before com- bining data. Standard errors are shown on the linear graph in Figure 3. The sensitivity maximum occurred aroun
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 360 420 430 540 600 Wavelength (nm) 360 420 480 540 600 Wavelength (nm) Figure 1. Solid line shows dark-adapted mean spectral sensitivity curve for Gnathophausia ingens (n = 25). Sensitivity is defined as the reciprocal of the relative number of quanta required to elicit a criterion response at each wavelength. Criterion responses were from 20 to 50 jiV. Values from individual experiments were normalized before com- bining data. Standard errors are shown on the linear graph in Figure 3. The sensitivity maximum occurred around 510 nm. (A) Dotted line displays the absorptance spectrum for a hypothetical pigment with a ^max of 505 nm and an of The absorptance spectrum was calculated from the Dartnall nomogram. and plotted as the ratio of absorptance at selected wavelengths to that at 505 nm. (B) Dotted line shows the absorptance spectrum for two hypothetical pigments with Xmax' of 490 and 520 nm, and of .5. Absorbance curves for the two pigments, obtained from Dartnall's template, were added together, and an absorptance curve was calculated from the result, normalized to the maximum value as above. this species with this apparatus, light of the same wave- length from another monochromator was substituted at various time intervals, and the intensity adjusted with a neutral density wedge until no response was seen. Subse- quent silent substitutions were attempted with other wavelengths of light, using a neutral density wedge to make very small intensity adjustments. Regression analysis The logarithmic spectral sensitivity values, measured at various wavelengths (every 10-20 nm from 350-610 nm) from chromatically adapted individuals, were sub- tracted from the values recorded from their dark-adapted eyes. The set of difference values from each animal was normalized, and the data from the same (adapting) color class were then averaged together. Linear regression lines were calculated for
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
