Heterotrophic glucose uptake and respiration in Lake Kinneret

✍ Scribed by T. Berman; O. Hadas; U. Marchaim

• Book ID: 104620676
• Publisher: Springer
• Year: 1979
• Tongue: English
• Weight: 553 KB
• Volume: 62
• Category: Article
• ISSN: 1573-5141
• DOI: 10.1007/bf00043545

✦ Synopsis

The turnover times of glucose, averaged for o-io m in the upper waters of Lake Kinneret and measured by the addition of single or multiple concentrations of substrate, ranged from 23 to 188 hours and 1 to 87 hours respectively . Potential uptake rates (estimated as Vmax) ranged from 0 .095 to 1 .94 µg glucose 1 -'h-', while measured uptake rates varied from 0.09 to 1 .1 µg glucose 1-'h -' . Concentrations of dissolved carbohydrates and glucose averaged 0 .71 mg glucose equivalents 1-' and 39 µg glucose F' respectively . No evident relationships between glucose cycling and any fractions of dissolved organic matter, phytoplankton biomass or primary productivity were found . Turnover times were generally most rapid immediately after the decline of the spring Peridinium bloom . The respiration percentage of incorporated glucose ranged from 25% to 61% with highest values during the summer months . Respiration may be influenced by the nature of the indigenous bacterial population as well as by temperature . Daily heterotrophic glucose carbon uptake was about 9% of the photosynthetic incorporation and could provide a bacterial yield of about 7 x 104 cells ml-'d-' .