Abstract
Experiments were conducted in order to specify the reductants responsible for the carbon dioxide fixation of the symbiotic sulfur bacteria in the gutless marine oligochaete Phallodrilus leukodermatus (Annelida) from shallow calcareous sediments in Bermuda. Carbon dioxide-uptake rates were suppressed by S= and stimulated by S2O3 =. Individuals which hosted bacteria containing reserve energy substances maintained a high short-term CO2-uptake activity, while bacteria in worm homogenates and in worms treated with an antibiotic (Baypen) did not show any significant metabolic activity. Absolute uptake rates in P. leukodermatus were usually considerably higher than those reported for other animals harbouring prokaryotic sulfuroxidizing symbionts. Utilization of thiosulfate rather than sulfide is compatible with the preferred occurrence of the worms around the redox discontinuity layer and has been confirmed in other “thiobiotic” animals. Sulfur stored in the symbiotic bacteria appears to be oxidized to sulfate and be excreted when the worms are held under energy-limited conditions. The data emphasize the complexity of the possible metabolic pathways involved in the oxidation of reduced-sulfur compounds by bacterial symbionts in marine invertebrates.
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Communicated by O. Kinne, Oldendorf/Luhe
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Giere, O., Wirsen, C.O., Schmidt, C. et al. Contrasting effects of sulfide and thiosulfate on symbiotic CO2-assimilation of Phallodrilus leukodermatus (Annelida). Mar. Biol. 97, 413–419 (1988). https://doi.org/10.1007/BF00397771
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DOI: https://doi.org/10.1007/BF00397771