engleski

Net-phytoplankton species dominance in a travertine riverine Lake Visovac, NP Krka

In relation to the environmental variables, species composition of the net-phytoplankton assemblage and seasonality of the dominant species were investigated in travertine monomictic stratified riverine Lake Visovac. One year investigation was based on monthly sampling from April 1995 to March 1996 at two deepest vertical profiles, with maximum depth of 25m. Diatoms, especially Asterionella formosa Hass. dominated net-phytoplankton assemblages with exception of late summer and autumn when dinoflagellate species Ceratium hirundinella (O.F. Müller) Bergh became dominate form. The effects of the short term dynamics of environmental factors on the algal growth in barrage lenitic area of calcareous river stressed several variables as important factors controlling annual net-phytoplankton distribution. The temperature was the most valuable variable affecting the species abundance, changes in dominance and species composition (Primer 5, BIO- ENV ; http://www.primer-e.com/). CCA analysis performed on abundance dataset and environmental variables confirm the importance of temperature but also highlighted total phosphorus, conductivity and silica.

fitoplankton; zajednica; diajtomeje; Asterionella formosa

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