. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 174 LANG, FORWARD, JR. AND MILLER 100 C/} z o W50 LU DC. AO CONTROLS 10 -7 10' r6 10 ,-5 10 -4 10 -3 10 -2 i 10" 1.0 INTENSITY ( W/m2) FIGURE 6. Intensity response for positive phototaxis of stage II Bulaiius improvisns at 480 nm. Closed triangle, dark-adapted at 20° C, lS(/fc (N = 26-47) ; open triangle, light-adapted at 20° C, 5%c (N = 53-60); open circle, light-adapted at 20° C, 30#c (N = 22-29). from 0.062-0.088 X 101"). This quantal intensity was chosen because at 480-nm light it produced a clear positive pho
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