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Utilization of naturally-occurring dissolved free and combined amino acids (DFAA and DCAA) and dissolved DNA (D-DNA) was studied in batch cultures of bacteria from 2 shallow marine environments, Santa Rosa Sound (SRS), Florida. USA, and Flax Pond (FP), Long Island, New York, USA. In addition to control experiments, cultures were enriched with various sources of C and N. In the SRS cultures, net C assimilation of DCAA, DFAA and D-DNA made up from 4 2 to 60 %of net bacterial C production. The average, relative incorporation of C from DCAA, DFAA and D-DNA was 0.13, 0.77 and 0.10, respectively. The corresponding values of N were 0.10, 0.81 and 0.09. Addition of NH,', DFAA, or both, increased the incorporation of DCAA, DFAA and D-DNA. Incorporation of N from DCAA, DFAA and D-DNA equaled 11 1 to 219 % of the bacterial N production. Including incorporation of NH,' and release of NO,-, calculated net bacterial N incorporation made up 4 8 and 290 %of bacterial N production. In the FP experiment, net assimilation of DCAA. DFAA and D-DNA equaled 66 to 91 % (average 77 %) of net bacterial C production. Largely all C incorporation was due to assimilation of DFAA. Enrichment of the cultures with NH4+, glucose, methylamines, and high-molecular-weight dissolved organic matter all increased bacterial production. Net N incorporation of DCAA, DFAA and D-DNA corresponded to between 100 and 180 % of net bacterial N production. In 3 cultures DFAA were the dominant (> 50 %) bacterial N source. In the other cultures, DFAA and NH,' were similar in importance as an N source, and together they accounted for 80 to 99 % of bacterial N incorporation. Including uptake of NH4' and uptake or release of NO3in the N budgets, bactenal N incorporation equaled 155 to 413 % of bactenal N production. The reason for this apparently excessive N uptake in both sets of cultures may be the release of organic nitrogen compounds.

Dissolved free amino acids, combined amino acids, and DNA as sources of carbon and nitrogen to marine bacteria