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Acta Botanica Croatica, Vol. 58 No. 1, 1999.

Izvorni znanstveni članak

Patchy distribution of phytoplankton in a highly stratified estuary (the Zrmanja estuary, October 1998)

Damir Viličić ; University of Zagreb, Faculty of Science, Department of Botany, Zagreb, Croatia
Mirko Orlić ; University of Zagreb, Faculty of Science, Department of Geophysics, Zagreb, Croatia
Zrinka Burić ; University of Zagreb, Faculty of Science, Department of Botany, Zagreb, Croatia
Marina Carić ; Institute of Oceanography and Fisheries, Dubrovnik, Croatia
Nenad Jasprica ; Institute of Oceanography and Fisheries, Dubrovnik, Croatia
Frano Kršinić ; Institute of Oceanography and Fisheries, Dubrovnik, Croatia
Ante Smirčić ; State Hydrographic Institute, Split, Croatia
Zvonko Gržetić ; State Hydrographic Institute, Split, Croatia

Puni tekst: engleski pdf 1.985 Kb

str. 105-125

preuzimanja: 307

citiraj

Sažetak

The abundance, biomass and species composition of phytoplankton were determined in relation to hydrographic conditions in the highly stratified Zrmanja Estuary, eastern Adriatic coast, Croatia, during the October 1998 episode of strong river outflow. Phytoplankton accumulated around the halo- cline in the middle portion of the estuary, where nanoplankton provided the dominant autotrophic constituent. Marine phytoplankton accumulated there due to more favorable light and nutrient conditions along the outflow plume, as well as reduced zooplankton grazing. Orthophosphate was detected as a limiting growth factor in the estuary. The phytoplankton species assemblages at the seaward and riverine ends of the estuary were made up of taxa with corresponding salinity preferences. A subsurface temperature maximum was detected in the middle portion of the estuary, due to the combined effect of radiative heating and reduced heat exchange at the halocline level, as well as the accumulation of suspended matter close to the halocline and selective absorption of solar radiation.

Ključne riječi

phytoplankton: microzooplankton; estuary; halocline; river discharge; nutrients; Adriatic Sea

Hrčak ID:

160610

URI

https://hrcak.srce.hr/160610

Datum izdavanja:

31.12.1999.

Posjeta: 702 *