Acta Botanica Croatica, Vol. 41 No. 1, 1982.
Izvorni znanstveni članak
The phytoplankton of Bijelo jezero in the summer of 1977
Dragica Gucunski
; Hrvatska
Sažetak
In the primary production of micro and macrophytic vegetation within the hydrological system of the Kopački Rit nature reserve, an essential role is played by Bijelo jezero (White Lake). It is among the shallowest of the reserve’s lakes and always dries out when the Danube falls to a low level. Although Bijelo jezero did have water throughout the summer of 1977, its depth, at the time the samples were taken, was only 30—47 cm.
The lake’s plankton is distinguished by its variety. Out of a total of 126 species, the largest group was made up of Chlorophyta (50 species), Bacillariophyceae (44 species), and Euglenophyta (17 species), while the greatest number of cells per cubic centimetre was found with Cyanophyta (315—1077 cells/cm3). The maximum level of the phytoplankton standing crop was found in the middle of summer (942 mg/m3), being made up as follows: Bacillariophyceae 446 mg/m3 or 47.4%; Chlorophyta 243 mg/m3 or 25.7%; Euglenophyta 59 mg/m3 or 6.3%; Pyrrophyta 34 mg/m3 or 3.6%; Cyanophyta 155 mg/m3 or 16.5%; and Mycophyta 5 mg/m3 or 0.5%.
The phytoplankton identified had a limnophillic and potamophillic character and developed under conditions which were subject to great change — complex hydrological circumstances, negative human factors, and competition for food by the many acquatic plants present.
Ključne riječi
Hrčak ID:
158591
URI
Datum izdavanja:
31.12.1982.
Posjeta: 1.552 *