. The Biological bulletin. Biology; Zoology; Marine biology. LIGHT RESPONSES OF BARNACLE NAUPLII 175 c/> 50. INTENSITY Figure 7. Intensity response for positive phototaxis of stage III and stage VI Balimus improvisus at 480 ran. Open triangle, light-adapted stage III at 20° C, 30'/rr (N = 22-29); open circle, light-adapted stage VI at 20° C. 30'.;, (N = 25-42); closed circle, dark-adapted stage VI at 20° C, 30'/, (N = 46-56). light-adapted larvae, dark-adapted larvae show no increase in MLV at full intensity (Table III). Directional response results further demonstrate the effects of dark a
. The Biological bulletin. Biology; Zoology; Marine biology. LIGHT RESPONSES OF BARNACLE NAUPLII 175 c/> 50. INTENSITY Figure 7. Intensity response for positive phototaxis of stage III and stage VI Balimus improvisus at 480 ran. Open triangle, light-adapted stage III at 20° C, 30'/rr (N = 22-29); open circle, light-adapted stage VI at 20° C. 30'.;, (N = 25-42); closed circle, dark-adapted stage VI at 20° C, 30'/, (N = 46-56). light-adapted larvae, dark-adapted larvae show no increase in MLV at full intensity (Table III). Directional response results further demonstrate the effects of dark adapta- tion. Light-adapted nauplii show a plateau of strong positive phototaxis from 10"a to 10"1 W/m2; a similar pattern occurs from 1(V4 to 10- W/m2 for dark-adapted nauplii (Fig. 6). A significant positive phototactic response is present at all intensities tested for dark-adapted larvae. For light-adapted larvae, no significant response occurs below 10"4 W/m2. In respect to percent response and MLV, dark-adapted nauplii appear to have a somewhat "stronger" response to favorable light intensities relative to light-adapted nauplii (Fig. 6). Some light-adapted stage II nauplii were also investigated at 30%e, 20° C, to permit comparison with later stage nauplii tested at higher salinity. A similar, but perhaps enhanced response, relative to results at 15%o was observed (Fig. 6). The change in salinity does not alter the basic pattern of response in stage II nauplii. Light response in later stage nauplii Smaller numbers of stage III and stage VI nauplii were tested for response to light, in addition to stage II nauplii. The later stage B. improvisus larvae are likely to be carried into increased salinity water ( Bousfield. 1955). Hence, these initial studies were conducted at 30%o. Phototactic response of light-adapted stage III naupli (30%o, 20° C) is similar to stage II nauplii (Fig. 7). The control MLV of stage III nauplii tends. Please note that
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