Abstract
Eight extracellular enzymes and their corresponding natural substrates were studied in an acid polyhumic lake. Highest activities were found for phosphatases (100–150 nmol 1−1 h−1), glucosidase (70–120 nmol 1−1 h−1), and aminopeptidases (20–30 nmol l−1 h−1), Significant relationships were found for natural polymeric substrate composition, variation and enzyme activities. Identified carbohydrates and amino acids contributed 1–5% to the DOC pool and are assumed to undergo significant processing by microbial glycosidases and aminopeptidases. Measured enzymes are partially modified in their activity by lake water acidity, temperature and humic matter. Extracellular enzymes are regarded as important regulators in microbial detritus processing and substrate utilization.
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Münster, U., Einiö, P., Nurminen, J. et al. Extracellular enzymes in a polyhumic lake: important regulators in detritus processing. Hydrobiologia 229, 225–238 (1992). https://doi.org/10.1007/BF00007002
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DOI: https://doi.org/10.1007/BF00007002