Abstract
The total daily flux of photosynthetically fixed carbon in light- and shade-adapted phenotypes of the symbiotic coral,
Stylophora pistillata
, was quantified. Light adapted corals fixed four times as much carbon and respired twice as much as shade corals. Specific growth rates of zooxanthellae
in situ
were estimated from average daily mitotic indices and from ammonium uptake rates (nitrate uptake or nitrate reductase activity could not be demonstrated). Specific growth rates were very low, demonstrating that of the total net carbon fixed daily, only a small fraction (less than 5 %) goes into zooxanthellae cell growth. The balance of the net fixed carbon (more than 95 %) is translocated to the host. New and conventional methods of measuring total daily translocation were compared. The ‘growth rate’ method, which does not employ
14
C, emerged as superior to the conventional
in vitro
and
in vivo
methods. The contribution of translocated carbon to animal maintenance respiration (czar) was 143 % in light corals and 58 % in shade corals. Thus, translocation in the former could supply not only the total daily carbon needed for respiration but also a fraction of the carbon needed for growth. Whereas light-adapted corals released only 6%, shade-adapted corals released almost half of their total fixed carbon as dissolved or particulate organic material. This much higher throughput of organic carbon may possibly benefit the heterotrophic microbial community in shade environments.
Reference45 articles.
1. Wax in coral mucus: Energy transfer from corals to reef fishes1
2. Energy Exchange in Coral Reef Ecosystems
3. Contributions to the study of marine products. 6. The occurrence of cetyl palmitate in corals. J. org;Bergmann W.;Chem.,1941
4. Black C. C. & Burris J. E. 1983 Diurnal carbon-14 partitioning between zooxanthellae and
5. the coral animal tissue of intact Seriatoporahystrix colonies. Mar. Biol. 75 117-120. Cheney D. 1973 Cell proliferation as an index of growth in corals: Incorporation of 3H-
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