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To test the response of a natural benthic microbial assemblage to differences in the composition of organic matter supply, surface sediments from the Arctic continental slope (1000 n~ water depth) were enriched with a vanety of organic compounds. Glycine and glucose represent substrates which can be directly utilized by bactena; protein, chitin, cellulose, starch and the lipld Tween require extracellular hydrolysis by peptidase, chitobiase, P-glucosidase, a-glucosidase and lipase, respectively. The effect of these enrichments on hydrolytic activity potentlals and on several parameters of microbial biomass was observed over a period of 63 d. Within 10 d , specific activities of P-glucosidase and chitobiase were enhanced by their respective substrates by a factor of 10 to 20. a-Glucosidase and peptidase were greatly inhibited in the presence of glucose and glycine, respectively. Peptidase, a-glucosidase and lipase activities were not induced by their respective substrates. The supply of starch, lipid and cellulose d ~ d not cause detectable growth of the bacterial assemblage for the whole p e r ~ o d of the experiment. Enrichment with ylycine, albumin, chitin and glucose resulted in significant biomass production of the bacterial populations with similar growth rates of 0.1 d.' after a lag phase of up to 10 d. However, the supply of amino acid sources resulted in a 60% higher bacterial biomass yield after 63 d compared to chitin and glucose.

Effect of organic enrichments on hydrolytic potentials and growth of bacteria in deep-sea sediments