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Abstract:
4-Methylumbelliferyl-substrates were used to measure the activity of extracellular β-D-glucosidase and phosphatase in small central European streams. The substrates could be used for stream water, sandy sediments, and coarser artificial substrata. Although β-D-glucosidase activity per unit surface area was about ten-times higher in coarse particulate sediments than in sandy sediments, maximum activity per unit volume was observed in sandy sediments. This means that for the stream as a whole, the greater proportion of the exoenzymatic cleavage activty occurs in the sandy streambed deposits.
