. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 198 S. J. SAWYER ET AL c <D 3 o- I- Significant in TCNN also. S3 S2a S2b si M Significant in SS2 only S5 S4 A5 2 - 1 - Not Significant A3 A2 —°— Al BD D Light AD Figure 2. Averages of burst frequency in SS2 of 10 specimens of Anthopieuni eleganlissima during the BD, D, and AD intervals. Anem- ones are grouped by burst pattern. Those anemones in which there is a significant difference in activity in SS2 and in the TCNN are grouped together in the upper portion of the figure. Anemones in which there is a significant differe
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 198 S. J. SAWYER ET AL c <D 3 o- I- Significant in TCNN also. S3 S2a S2b si M Significant in SS2 only S5 S4 A5 2 - 1 - Not Significant A3 A2 —°— Al BD D Light AD Figure 2. Averages of burst frequency in SS2 of 10 specimens of Anthopieuni eleganlissima during the BD, D, and AD intervals. Anem- ones are grouped by burst pattern. Those anemones in which there is a significant difference in activity in SS2 and in the TCNN are grouped together in the upper portion of the figure. Anemones in which there is a significant difference in activity only in SS2 are grouped together in the middle portion of the figure. Anemones in which there is no significant difference in activity in SS2 are grouped together in the bottom portion of the figure. Zooxanthellate (S) anemones are indicated by solid lines, and apozooxanthellate (A) anemones are indicated by dashed lines; numbers denote individual specimens. Standard errors are not shown, but range from 5 to 33% of the means. was significantly lower than those in the BD and D in- tervals. This anemone had a 20-min dark period, the only dark period longer than 7 min (Table I). This specimen was the only one to show significance in the TCNN alone. It is interesting that the only anemone having a long dark treatment was the only anemone not to show a significant change in SS2 burst rate resulting from the change in irradiance. The frequency of activity in the TCNN, SSI, and SS2 is higher in zooxanthellate anemones than in apozooxan- thellate individuals (P < , Duncan's Multiple Range Test). This may be manifested in the greater responsive- ness of the zooxanthellate anemones in behavioral studies (unpub. results), and also be related to the greater effect the dark treatment had on the burst rates, because all of the zooxanthellate anemones showed a significant effect of the treatment, whereas only three of the apozooxan- thellate anemones did. The bur
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