EXTRACELLULAR ENZYME-ACTIVITY - INDICATIONS FOR HIGH SHORT-TERM VARIABILITY IN A COASTAL MARINE ECOSYSTEM
| Type | : | ACL |
|---|---|---|
| Nature | : | Production scientifique |
| Au bénéfice du Laboratoire | : | Oui |
| Statut de publication | : | Publié |
| Année de publication | : | 1995 |
| Auteurs (2) | : | KARNER M RASSOULZADEGAN Fereidoun |
| Revue scientifique | : | Microbial Ecology |
| Volume | : | 30 |
| Fascicule | : | 2 |
| Pages | : | 143-156 |
| DOI | : | 10.1007/BF00172570 |
| URL | : | https://doi.org/10.1007/BF00172570 |
| Abstract | : | Extracellular alpha-glucosidase, beta-glucosidase, and aminopeptidase activity variations (measured by use of fluorogenic substrate analogs) at a coastal station in the Mediterranean Sea were investigated over a 1-year period. A 27-h cycle and daily measurements were made in a summer situation. We observed strong relative diurnal variations, compared to seasonal variations, in alpha- and beta-glucosidase. Within 24 h, 0-100% of both alpha- and beta-golucosidase were found in the dissolved phase. The aminopeptidase activities did not show a strong diurnal variation, but day to day variations were similar in magnitude to seasonal changes. Consistently, high proportions of all three enzymes were found in the dissolved phase on a seasonal scale. Seasonal measurements at 50- and 100-m depths showed a weak negative dependency on depth for extracellular enzyme activity. The potential importance of both hourly and daily changes in extracellular enzyme activity and of free enzymes is considered. |
| Mots-clés | : | BACTERIAL UTILIZATION; BACTERIOPLANKTON; EUTROPHIC LAKE; FREE AMINO-ACIDS; PHYTOPLANKTON; RELEASE; SEA; SEAWATER; TROPHIC GRADIENT; WATER |
| Commentaire | : | Times Cited in Web of Science Core Collection: 83 |
| Tags | : | - |
| Fichier attaché | : | - |
| Citation | : |
Karner M, Rassoulzadegan F (1995) EXTRACELLULAR ENZYME-ACTIVITY - INDICATIONS FOR HIGH SHORT-TERM VARIABILITY IN A COASTAL MARINE ECOSYSTEM. Microb Ecol 30: 143-156 | doi: 10.1007/BF00172570
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