. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. D. R. STOKES AND N. B. RUSHFORTH 4 on t on. .5mV 5Sec FIGURE 5. Light induced CP activity (A) and multiple CP activity (B) of Clava following a 15 min period of dark-adaptation. Onset of illumination is indicated by the arrows. added to the experimental dish until a final concentration of 40% was obtained. The polyps were stimulated in the burst generator region with four shocks at 2-second intervals; the stimulus burst being repeated at 10-minute intervals. Only polyps giving both CPs and DBFs to two consecutive stimulus te
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. D. R. STOKES AND N. B. RUSHFORTH 4 on t on. .5mV 5Sec FIGURE 5. Light induced CP activity (A) and multiple CP activity (B) of Clava following a 15 min period of dark-adaptation. Onset of illumination is indicated by the arrows. added to the experimental dish until a final concentration of 40% was obtained. The polyps were stimulated in the burst generator region with four shocks at 2-second intervals; the stimulus burst being repeated at 10-minute intervals. Only polyps giving both CPs and DBFs to two consecutive stimulus tests 10 minutes apart in normal sea water were used. A typical record in normal sea water is shown in Figure 4A. Both visual and electrical records were made follow- ing each stimulus regime. The results were similar for five polyps, one from each of five colonies. Isosmotic MgClo abolishes nearly all CP activity as well as the correlated behavioral responses after ten minutes exposure (Fig. 4B). The DBFs, however, persist in somewhat altered form and increased latency, despite the absence of a behavioral response. The bursts appear to consist of uniformly facilitating pulses of somewhat diminished amplitude from that in normal sea water. Delayed bursts have been recorded for up to 3 hours in MgQ2 without further change. Both CPs and typical DBF bursts are restored following exposure to normal sea water for a brief period (10-30 min ; Fig. 4D). Effects of light Whole colonies of Clava respond to sudden sharp increases in illumination after an apparent delay of some several seconds. Polyps contract symmetrically and often in distinct steps in much the same manner as occurs following CP activity. There does not appear to be a systematic co-ordination of polyp contraction throughout the colony; polyps nearest the source of illumination generally con- tract first, but there is no set order of responses. Synchronized tentacle depres- sion characteristic of DBS activity has not been o
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
