Naslov
Bacterial abundance and activity in the highly stratified estuary of the Krka River

Autori
Fuks, Dragica ; Devescovi, Massimo ; Precali, Robert ; Krstulović, Nada ; Šolić, Mladen

Izvornik
Marine chemistry (0304-4203) 32 (1991); 333-346

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
bacterial abundance; activity; stratified estuary; central Adriatic Sea
(bacterial abundance; bacterial activity; stratified estuary; central Adriatic Sea)

Sažetak
Temporal and spatial abundance, and activities of heterotrophic bacteria in highly stratified Krka River estuary (central Adriatic Sea) were analyzed in spring 1987-1989. The heterotrophic activity was determined by the uptake of /14-C/glucose.The bacterial abundance (1-23x10E8 cells/L) in the estuary was higher than in the open central Adriatic waters but five times lower than the open northern Adriatic waters.The glucose uptake rate in the Krka estuary varied remarkably along the horizontal and vertical profiles (0.004-1.620 ug C/L/h). Examination of the depth profiles did not reveal a significant correlation between chlorophyll a and bacterial abundance and activity, respectively. Short-time variations of microbial parameters in the freshwater and interface layer of stratified depth profiles were detected. The maximal glucose incorporation (80%) was maintained in the interface layer by small free-living bacteria. The glucose mineralization rate increased with salinity, and reached maximum value (60%) in the lower part of the interface layer.

Izvorni jezik
Engleski

POVEZANOST RADA