Extracellular enzymatic activity and secondary production in free-living and marine-snow-associated bacteria
- Author(s)
- Markus Karner, Gerhard J. Herndl
- Abstract
Abundance, production (measured as thymidine incorporation) and extracellular enzymatic activity in free-living and marine-snow-associated bacteria were measured in the northern Adriatic Sea. Although bacterial density and production were similar in both free-living and marine-snow-associated bacteria, hydrolytic activity (α- and β-glucosidase and l-aminopeptidase) was significantly higher in marine-snow-associated bacteria, in terms of both absolute and per-cell rates. As concentrations of dissolved total and monomeric carbohydrates and free amino acids in marine snow were very close to those in the ambient water, we suggest that the observed differences between free-living and marine-snow-associated baycteria do not simply reflect catabolic repression of enzyme expression in one of the bacterial components. Whether substrate induction is responsible for the observed higher hydrolase activity in marine-snow bacteria and/or whether there are distinct bacterial species obligatorily associated with marine snow remains unknown.
- Organisation(s)
- External organisation(s)
- University of Vienna
- Journal
- Marine Biology
- Volume
- 113
- Pages
- 341-347
- No. of pages
- 7
- ISSN
- 0025-3162
- DOI
- https://doi.org/10.1007/BF00347289
- Publication date
- 06-1992
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 106021 Marine biology
- ASJC Scopus subject areas
- Ecology, Evolution, Behavior and Systematics, Ecology, Aquatic Science
- Sustainable Development Goals
- SDG 14 - Life Below Water
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/59c0d70a-25c5-4adf-bb00-8bbf6f764b4b