Naslov
When do phytoplankton blooms cause the most intense hypoxia in the northern Adriatic Sea?

Autori
Legović, Tarzan ; Justić, Dubravko

Izvornik
Oceanologica acta (0399-1784) 20 (1997), 1; 91-99

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

Ključne riječi
hypoxia; phytoplankton bloom; nutrients; eutrophication; Adriatic Sea; organic carbon; anoxia

Sažetak
Eutrophication of the northern Adriatic Sea was investigated using data on dissolved oxygen (DO) from 1911 to 1982. Beginning in the period 1955-1965, DO concentrations increased in the surface layer and decreased close to the bottom in all seasons except winter. These changes are attributed to an increase of the anthropogenic nutrient inflow. The occurrence of hypoxia near the bottom and its disappearance were investigated using the vertical distribution of DO on the transect from the Po delta to Rovinj during 1973. Horizontal distributions of DO close to the surface and near the bottom show prominent gradients from the Po delta towards the middle of the northern Adriatic Sea. Application of a simple box model indicates that phytoplankton blooms which occur in July cause the lowest DO concentrations near the bottom. For DO concentrations near the bottom to increase, anthropogenic nutrient inflow into the northern Adriatic Sea must be significantly reduced.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

POVEZANOST RADA