Entwicklung von Bakterienzahl und -aktivität während einer Frühjahrsblüte des Phytoplanktons in der Ostsee

Publisher Website
Google Scholar
Abstract
During a 10-day period at a fixed station in the Bornholm Sea the total bacterial number, biomass, saprophyte counts, physiological properties of saprophytes and the uptake of organic solutes by heterotrophic microorganisms were determined. The 2 maxima of the primary production were closely followed by peaks of maximum uptake velocity of glucose. An increase of the saprophyte counts was observed only during the 2nd primary production maximum; the total bacterial number and biomass showed no correlation with the phytoplankton development. The delivery of organic solutes due to exudation processes results first in an activation of certain bacterial groups; this is then followed by an increase in counts within these groups while the total bacterial number does not necessarily change.