engleski

Microphyte community structure on Ceratophyllum demersum in drainage channels (Baranja, Eastern Croatia)

Macrophytic vegetation present in various aquatic ecosystems provide a good substrate for the development of epiphytic algae and cyanobacteria. A macrophyte Ceratophyllum demersum is particularly well developed and has great coverage in channels characterised by low water velocity. The research on microphyte diversity and abundance on C. demersum was conducted in three drainage channels in Baranja (Eastern Croatia) in September 2016. Different values of physico- chemical water properties were found in investigated biotopes. Higher concentrations of oxygen (9.72 mg/L), total phosphorus (0.88 mg/L) and higher conductivity were found in the shallowest channel in Jagodnjak, while two other channels (near Eblin and Darda) had a higher concentration of nitrogen compounds. The highest content of chlorophyll a in water (41.61 μg/L) and epiphyton (Chl-a: 509.19 ± 67.88 µg/gDW), as well as high microphyte diversity (94) and abundance (555 672, 05 x 10 3 ± 49 261, 11 x 10 3 cell/gDW) was found in the channel near Eblin. Cyanobacteria Heteroleibleinia ucrainica was the most abundant at all localities accompanied by Tolypothrix sp. in the channel near Darda. An invasive and potentially toxic cyanobacteria Cylindrospermopsis raciborskii was found near Eblin. The results indicate that despite differences in the physico-chemical environment and channel hydro-morphology, the substrate type is one of the most important factors conditioning epiphyton development and structure in eutrophic aquatic biotopes.

algae ; cyanobacteria ; epiphyton ; macrophyte

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