engleski

Ecological characteristics and distribution of Potamogeton species in the rivers of Pannonian ecoregion of Croatia

This thesis gives an insight of ecological characteristics of pondweeds (Potamogeton L.) in the rivers in the Pannonian ecoregion of Croatia. Data on distribution of species and their abundances were collected on 166 sample sites in the period 2016-2020, as well as physicochemical parameters of water. The data used in the paper was processed partly in the R programming language, partly in QGIS and in the Canoco 5 and Juice 7 programs. Statistical multivariate methods were used in the paper: CCA, DCA, GAM and TWINSPAN. Physicochemical parameters of water related to pondweed species sites show high levels of trophy. Of the nine species mentioned in the paper, 3 species showed the highest incidence but also tolerance to eutrophic conditions. These are P. nodosus, the species that was present in all species of water bodies with the highest incidence, and P. crispus and P. pectinatus. These species can serve as bioindicators of eutrophicated water. Other species showed lower incidence, but also lower tolerance to eutrophication. The species P. lucens proved to be the most sensitive to eutrophication, which can also serve as an indicator of better water quality.

Pondweed, Statistical analysis, Sava-Drava interfluve, Rstudio, PCA, CCA, GAM

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