hrvatski

Raznolikost mikrofitskih zajednica u sedimentu Dunava i Sakadaškog jezera

Microphytes (algae and cyanobacteria) in the sediment of aquatic biotopes greatly influence its stabilization capacity, regulate nutrient cycling (benthic-pelagic) and primary production. Moreover, they represent one of the main quality elements for the assessment of the ecological status of aquatic ecosystems according to the European regulation. The research on sediment-associated microphytes was conducted in the Danube River and Lake Sakadaš in autumn of 2016. Due to the low Danube water level (0, 71-2, 54 m) different ecological conditions were established in the two investigated biotopes. Higher concentrations of nutrients (total nitrogen: 3, 0731 mg/L ; total phosphorus: 0, 4697 mg/L ; nitrites: 0, 0107 mgN/L) and surface water chlorophyll concentrations, as well as a greater amount of sediment inorganic and organic matter were found in Lake Sakadaš. On the contrary, higher water nitrate concentration (1, 372 mgN/L) and higher sediment chlorophyll content (Chl-as: 9, 64±1, 34 µg/cm2 ; Chl-bs: 2, 76±0, 52 µg/cm2 ; Chl-cs: 3, 69±1, 59 µg/cm2) were recorded in the Danube. The research found high microphyte diversity in the sediment of both the river (63) and its floodplain lake (99). Two representatives of cyanobacteria, an invasive species Cylindrospermopsis raciborskii and Heteroleibleinia ucrainica, as well as green alga Monoraphidium contortum and diatom Navicula cryptocephala were the most common microphytes at both sites. The established microphyte community structure suggests that both aquatic ecosystems have characteristics of eutrophic waters.

Alge ; Cijanobakterije ; Epipelon ; Fitobentos ; Kopački rit

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