. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CRUSTACEAN PIGMENTARY EFFECTORS 283 in the white pans exposed to lux was ; in the black pans at lux, ; in the white pans at 1400 lux, ; in the black pans at 1400 lux, We see from these data that the DPI and erythrophore stages are independent of each other. For example, the DPI of prawns in black pans under an illumination of 1400 lux was larger than the DPI of the prawns in white pans under an illumina- tion of lux but smaller than the DPI of the prawns in white pans under an illuminatio
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CRUSTACEAN PIGMENTARY EFFECTORS 283 in the white pans exposed to lux was ; in the black pans at lux, ; in the white pans at 1400 lux, ; in the black pans at 1400 lux, We see from these data that the DPI and erythrophore stages are independent of each other. For example, the DPI of prawns in black pans under an illumination of 1400 lux was larger than the DPI of the prawns in white pans under an illumina- tion of lux but smaller than the DPI of the prawns in white pans under an illumination of 1400 lux, yet the red chromatophoric pigment of the prawns in the black pans was nearly maximally dispersed while this pigment was always maxi- mally concentrated in the prawns in the white pans. On the basis of these data, it is valid to conclude that the hormonal control cannot be completely the same for both of these pigmentary effectors. - -. 8 12 FRACTION NUMBER FIGURE 4. The Distal Pigment Indexes (DPI) of prawns which had received injections of fractions of prawn eyestalks (dots) or abdominal nerve cords (circles). The horizontal line at DPI = is the mean value of the controls. The aim of the next experiment was to compare the distal retinal pigment light- adapting potencies of crude extracts of eyestalks and abdominal nerve cords. Prawns that received the equivalent of one-half abdominal nerve cord per dose had a DPI of one hour after the extract had been injected whereas prawns that received eyestalk extracts prepared in a concentration of either one-half or one eyestalk equivalent per dose had DPI's one hour after the extracts were injected of and , respectively. The mean value for the controls was The crude extracts of the abdominal nerve cords evoked less light adaptation of the distal retinal pigment than did the crude extracts of the eyestalks. Figure 4 presents the mean results obtained when fractions of the eye
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
