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Dissolved hurnic substances from 3 marine environments with varying vascular plant influence were shown to contain biologically labile components. Biomass of marine bacterioplankton increased in grazer-free incubations in the presence of humic substance supplements equivalent to 2-fold and 5-fold natural concentrations. Humic substances were present in highest concentration in seawater collected from a mangrove swamp site; these humics had the highest vascular plant influence (estimated at 66% based on lignin phenol analysis) and yielded the least bacterial growth on a carbon basis. From 3 to 11 % of the humic substances from all 3 sites were utilized by marine bacterioplankton over a 5 d period. Results of this study suggest that some fraction of the humic substances pool can have a relatively short turnover time in seawater, and point out the importance of identifying which specific components of the &ssolved organic carbon pool are available for supporting marine bacterioplankton production.

Support of bacterioplankton production by dissolved humic substances from three marine environments