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The aim of the study was to compile an inventory and determine the ecological characteristics of the spontaneous flora of the restored water reservoirs and their wet banks in the western part of Lublin in the years 1997–2013. The study objects are small reservoirs located at the UMCS Botanical Garden in the Czechówka River valley. These ponds are subjected to strong anthropogenic pressure. 68 plant species from 33 families and 58 genera were recorded in the flora of the ponds and their wet banks. An important feature of the described water bodies is the large proportion of native species (94% of the flora). Cryptophytes and hemicryptophytes as well as biological groups combining the features of hemicryptophytes and cryptophytes are the predominant life forms. Perennials account for 80% of the flora. The ponds and their wet banks are inhabited by 25 medicinal and 19 bee forage plants.
Intensified human impact in urban catchments is reflected through degradation of hydrological cycles and acceleration of matter, energy and pollutants flows. In this study the comparative analysis of occurrence, concentrations and transfer of twelve dioxin-like PCBs in the bottom sediment collected from five cascade reservoirs located on the Sokołowka River (in the northwestern part of the city of Łodź, central Poland) were determined using isotopically labelled internal standards and HRGC/HRMS. The total concentration of analyzed PCBs ranged from 79.75 to 3,741.34 ng/kg d.w. with maximum concentrations in the last two reservoirs (3,741.34 and 2,594.36 ng/kg d.w., respectively). Reservoirs situated at the beginning of the cascade system showed concentrations several times lower: 694.32 in the first, 292.15 in the second and 79.75 ng/kg d.w. In the third reservoir. The obtained data showed moderate or strong correlations between PCB concentration in sediments and environmental conditions of the water column: pH (-0.81), conductivity (0.94), mineral suspended solids (0.82), total and organic suspended solids (0.61), total phosphorus (-0.83) and total nitrogen (0.67). Furthermore, these parameters could have played an indirect role in PCB reduction through the stimulation of phytoplankton production. This in consequence might have influenced PCB pathways in reservoirs through changes in their sedimentation, transport and degradation processes as significant relations between PCBs and chlorophyll a content was found (0.64).
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