Original scientific paper

Seasonal Oscillations in Phytoplankton in the Protected Region of the Swampy Area of Kopachevo (Kopački rit)

Dragica Gucunski ; Hrvatska

Abstract

During the spring, summer and autumn of 1970 the oscillations in phytoplankton quality were investigated at four localities of the protected area of Kopachevo in Baranja near Osijek (Hulovski kanal, Bijelo, Kopačko and Sakadaško jezero, fig. 1).
The results show that the highest number of phytoplanktonic taxa was found at the end of summer and at the beginning of autumn and the lowest one at the beginning of spring and the end of autumn. In the spring plankton Chrysophyta dominated in the number of taxa, while the number of Chlorophyta was constantly growing. During the summer months Chrysophyta and Chlorophyta were prevaleat, and Cyanophyta, Euglenophyta, Pyrrhophyta and colourless flagellates were most numerous at that time. In the autumn plankton Chrysophyta and Chlorophyta dominated, while Cyanophyta and Euglenophyta also had a considerable number of taxa at the beginning of autumn (Fig. 2—5).
The highest number of taxa was found in Bijelo jezero (266), and the lowest number was stated in Hulovski kanal (238, Tab. 1).
Kopačko, Bijelo and Sakadaško jezero had a higher number of common taxa in comparison with the number of common taxa in the mentioned lakes and Hulovski kanal, which is probably conected with the possibility of the autochtone phytoplankton to stay in the lakes in spite of the constant activity of Hulovski kanal in 1970.

Keywords

Hrčak ID:

157925

URI

https://hrcak.srce.hr/157925

Publication date:

31.12.1974.

Article data in other languages: croatian

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