. 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" 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 X 101"). This quantal intensity was chosen because at 480-nm light it produced a clear positive pho
. 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" 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 X 101"). This quantal intensity was chosen because at 480-nm light it produced a clear positive phototactic response, but did not evoke a maximal response. Analysis of DOT for nauplii indicates a broad response spectrum (Fig. 5). Increasing the ±15° "window" for positive response to ± 45° produces a similar curve at response levels 30 to 40% higher. The peak percentage of positive photo- taxis occurs at 480 nm (60% ± 15° ; 97% ±45°), however similar strong responses are evident at 500 to 520 nm. A significant negative response did not occur at any wavelength. Although peak swimming speeds were found between 460 and 520 nm, distinct differences in MLV relative to wavelength are absent. One way analysis of variance followed by the Duncan test (P -- ) yields three broadly overlapping homo- genous subsets, where the difference in the means of any two groups within a subset is not significant (Table II). Intensity response Light- and dark-adapted stage II nauplii (20° C, 15%C) were exposed to seven intensities of 480-nm light. In both groups, response to light was either positive or not evident; negative phototaxis did not occur significantly above random pre- dictions (Fig. 6). In close agreement with initial results, light-adapted nauplii exhibit a signif- icant MLV increase at light intensities above 10~3 W/m2 (Table III). Dark- adapted nauplii significantly increase MLV above 10~* W/m2 and, in contrast to. Please note that these images are extracted
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
