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Carbon metabolism and strobilation in cassiopea andromeda cnidaria scyphozoa significance of endo symbiotic dinoflagellates



Carbon metabolism and strobilation in cassiopea andromeda cnidaria scyphozoa significance of endo symbiotic dinoflagellates



Marine Biology (Berlin) 65(1): 25-34



Scyphopolyps and scyphomedusae of C. andromeda Forskal (Cnidaria, Scyphozoa) containing dinoflagellate endosymbionts (zooxanthellae) were investigated for rates and pathways of C fixation. Photosynthesis by the algae, accounting for 80 and 15 .mu.mol C h-1 on a dry weight basis in medusae and polyps, respectively, by far exceeds dark incorporation of inorganic carbon by the intact association. Photosynthetic carbon fixation is operated via C3 pathway of C reduction. DCMU[3-(3,4-Dichlorophenyl)-1,1-dimethylurea]-treatment (1 .times. 10-6 M and 1 .times. 10-5 M) completely inhibits light-dependent C assimilation. Major photosynthates presumably involved in a metabolite flow from algal symbionts to animal tissue are glycerol and glucose. A total of 5-10% net algal photosynthate appears to be released in vivo to the host. This is probably less than the energy supply ultimately required for the nutrition of the polyps and medusae. The presence of zooxanthellae proved to be indispensable for strobilation in the scyphopolyps. Photosynthesis by algal symbionts and photosynthate release is obviously not essential for the initiation of ephyrae as is shown by DCMU-treatment, culture in continuous darkness, and aposymbiotic controls. Strobilation is supported, but not triggered by algal photosynthetic activity. The induction of strobilation thus seems to depend on a more complex system of regulation.

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Accession: 004877855

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DOI: 10.1007/bf00397064



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