engleski

The influence of extremely high floodings of the Danube River (in August 2002) on the trophic conditions of Lake Sakadaš (Nature Park Kopački rit, Croatia)

The influence of extremely high floodings of the Danube River (in August 2002) on the trophic level of Lake Sakadaš (Nature Park Kopački rit) was analysed according to "in situ" microphytoplankton biomass and algal growth potential (AGP) of Chlorella kessleri FOTT et NOV. Comparative analyses of trophic level of Danube and Lake Sakadaš were done in September and November of 2002. The total microphytoplankton biomass (25.65 mg/L - 33.24 mg/L) in Lake Sakadaš was lower than during its usual hydrological conditions. Allochthonous Danubian phytoplankton with dominance of the Bacillariophyceae community had a strong impact on the qualitative composition of phytoplankton in Lake Sakadaš in September, while it was supplement to Dinobryon - Synura community in November. According to the AGP results, the oligotrophic condition of Lake Sakadaš was proved and algal growth was N and P-limited. Based on the given results, it is evident that the extremely high floodings in August of 2002 reduced the usual trophic potential of highly productive Lake Sakadaš.

Danube; flooding; Kopački rit; microphytoplankton; bioassay

nije evidentirano