FIG. 1.

(A) Cell biomass (▪) and bacterial direct count (□) estimates for MGP sediment cores at different depths. (B) Aminopeptidase (substrate, l-leucine-4-methylcoumarinyl-7-amide) activity in MGP sediment cores at different depths. (C) Chitinase (substrate, 4-methylumbelliferyl-β-d-glucosaminide dihydrate) activity in MGP sediment cores at different depths. (D) Temperature range for aminopeptidase (▪) and chitinase (□) activities in MGP sediment grabs. All values are averages and standard deviations from five sediment samples.