The spatial heterogeneity of photosynthesis and calcification of single polyps of the coral Galaxea fas- cicularis was investigated. Photosynthesis was investi- gated with oxygen microsensors. The highest rates of gross photosynthesis (Pg) were found on the tissue covering the septa, the tentacles, and the tissues sur- rounding the mouth opening of the polyp. Lower rates were found on the tissues of the wall and the coenosarc. Calcification was investigated by radioactive tracers. The incorporation pattern of 45Ca and 14C in the cor- allites was imaged with use of a Micro-Imager. The b-images obtained showed that the incorporation of the radioactive tracers coincided with the Pg distribution pattern with the highest incorporation rates found in the corallite septa. Thus, the high growth rate of the septa is supported by the high rates of Pg by the symbiont in the adjacent tissues. The total incorporation rates were higher in light than in dark, however, the distribution pattern of the radioisotope incorporation was not af- fected by illumination. This further emphasizes the close relation between calcification and photosynthesis.
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