The composition and diversity of the macrophyte and macroinvertebrate community were studied in standing water environments of the Drava field. The main purpose of the research was evaluation of the impact of environmental factors on the biodiversity and which of these factors best determine the composition of studied communities. 19 diverse standing water bodies were selected. The field work was fulfilled in August and September 2021. The species diversity and coverage of macrophytes were studied. Measurements of selected physical, chemical and hydromorphological factors were completed together with evaluation of environmental factors. At each sample site, a water sample was collected and macroinvertebrates were sampled by using a hand net. Water samples were then analysed in a laboratory, where the values of nitrate and orthophosphate were measured and macroinvertebrates were identified. Macroinvertebrate samples were determined to the family level. 67 taxa of macrophytes and 73 families of macroinvertebrates from 18 higher taxa were recorded. The influence of environmental factors on the macrophyte and macroinvertebrate communities were tested by direct gradient analyses. It was discovered that macrophyte diversity influences the number of families and the number of higher macroinvertebrate taxa. The composition of the macrophyte community was influenced by the presence of fish, conductivity, oxygen concentration and the proportion of canopies. However, the macroinvertebrate community was best determined by substrate particle size, Secchi depth and the proportion of CPOM.
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