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Fig. 5. Diel cycle of catalase (CAT) activity from coral tissue and symbiotic
zooxanthellae at the 5-m depth in Eilat, Red Sea. Measurements were performed
between 3 and 5 March 2002. Activity is presented as % activity [(U
mg-1 protein)/(max U mg-1 protein)] for (A) F.
favus (N=3), (B) G. lobata (N=2) and (C)
P. sinuosa (N=3). The black bars represent CAT activity of
the animal tissue and the gray bars represent CAT activity of the
zooxanthellae. Values are represented as means ± s.d. (night=05.00 h;
morning=08.00 h; mid.=10.00-14.00 h; afternoon= 16.00 h).