engleski

Seasonal changes of phytoplankton in shallow floodplain lake

The study was conducted to determine the influence of environmental parameters on phytoplankton structure and dynamics in the shallow lake (Lake Kopačko, 200-250 ha, depth 2-5 m) within the Kopački Rit floodplain. The investigation was carried out in different seasonal and hydrological conditions during winter, late spring and summer period characterised by high nutrient concentrations, especially total phosphorus (from 560 μg/L to 1804 μg/L). A total of 129 phytoplankton species were found, while phytoplankton abundance ranged from 8.83 x 106 to 87.52 x 106 individuals/L. Stable hydrological conditions and high nutrient concentrations during the winter period were favourable for the development of C, D and X1 (X3, J and TB) phytoplankton functional groups. High Danube water level and flooding conditions in late spring favoured the species from groups J, Y and X1 (C and D), while during the stable hydrological conditions and lower concentrations of nutrients, cyanobacteria from H1 and S1 and chlorococcal green algae from J and X1 functional groups were well developed. Results show that despite the differences in hydrological conditions and nutrient concentrations, phytoplankton structure was highly dependent on the winter community. Therefore, studies on winter phytoplankton communities are important for assessing and predicting annual changes of phytoplankton in shallow lakes.

succession ; winter phytoplankton ; functional classification ; protected area

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