Heterotrophic Utilization of Sucrose in an Artificially Enriched Lake

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Abstract
Utilization of sucrose by heterotrophic microorganisms was measured in a small lake enriched with 5.54 g C/m2 per year as sucrose. Heterotrophic activity exhibited fluctuations representing the damped oscillations of a disturbed steady state system, stabilizing 3 months after the commencement of enrichment. By late summer, reduction of the weekly addition of sucrose to a few micrograms per liter was accomplished within a day by the increased microbial activity resulting from rapid growth of heterotrophic microorganisms. Heterotrophic conversion (preenrichment) of sucrose to particulate carbon in the epilimnion between July and October 1971 was 2–17% of primary production. 25–35% of total sucrose utilized was converted to carbon dioxide, the remainder being incorporated into particulate material or released as nonvolatile products of metabolism.

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