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Bloom of the potentially toxic cyanobacterium P. rubescens : seasonal distribution and possible drivers of its proliferation in the Vrutci reservoir (Serbia)

Ponjavić Ana Blagojević, Kostić Dušan, Marjanović Prvoslav, Trbojević Ivana, Popović Sladana, Predojević Dragana, Simić Gordana Subakov

Oceanological and Hydrobiological Studies

2019

Vol. 48, No. 4

316--327

Planktothrix rubescens is a filamentous cyanobacterium with a worldwide distribution in lakes and reservoirs of varying size and morphology. The objective of this study was to identify the population dynamics and the major drivers of P. rubescens blooms. Samples for qualitative and quantitative analysis of phytoplankton were collected every month in 2014 and 2015 from stationary depths, while the main physical parameters were measured in situ along the water column. Samples for chemical analysis were collected below the surface, at mid-depth (metalimnion) and near the bottom. In the periods of thermal stratification, P. rubescens formed the maximum biomass in the metalimnion, however, its volume-weighted biomass reached the maximum value in the winter mixing period (4.40 mm3 l−1). Changes in the P. rubescens population in the reservoir were related to changes in the measured environmental parameters. Significant physical, hydrological, meteorological and chemical parameters were distinguished based on the multivariate analysis. The variable associated with water-level fluctuations showed the highest positive correlation with P. rubescens biomass. We conclude that it is necessary to establish water quality monitoring and prevent excessive water-level fluctuations to ensure a high quality of water supplies from the reservoir.

The potential impact of land use changes on heavy metal contamination in the drinking water reservoir catchment (Dobczyce Reservoir, south Poland)

Zemełka Gabriela, Kryłów Małgorzata, Szalińska van Overdijk Ewa

Archives of Environmental Protection

2019

Vol. 45, no. 2

3--11

To investigate and assess the effects of land use and its changes on concentrations of heavy metals (Pb, Zn, Cd, Cu, Mn, Ni, Fe) in the tributary of drinking water reservoir catchment, soils of different land use types (forest, arable land, meadows and pastures, residential areas), suspended sediment and bottom sediment were collected. Heavy metals were analyzed using atomic absorption spectrophotometry (AAS). The metal distribution pattern was observed, where Zn and Cd could be considered as main metal contaminants. The variation in the concentration level of Zn and Cd in studied soils showed the impact of pollution from anthropogenic activities. Also some seasonal variations were visible among the suspended sediment and bottom sediment samples which could be associated with land agricultural practices or meteorological conditions. The sediment fingerprints approach used for determining sources of the suspension in the catchment showed (Kruskal-Wallis H test, p˂0.05), that only Mn and Ni were not able to be distinguished among the potential sediment sources. A multiple linear regression model described the relationship between suspended sediment and 4 types of soil samples. The results related suspended composition mostly to the samples from the residential land use. Considering the contemporary trend of observed changes in land use resulting in conversion of agricultural areas into residential and service structures these changes can be essential for the contamination of aquatic environment. This situation is a warning sign due to the rapid industrialization, urbanization and intensive agriculture in this region what can significantly affect the drinking water quality.

Celem pracy była ocena wpływu użytkowania gruntów i ich zmian na stężenia metali ciężkich (Pb, Zn, Cd, Cu, Mn, Ni, Fe) w dopływie zlewni zbiornika wody pitnej. Do badań pobrano próbki gleb z różnych typów użytkowania gruntów (las, grunty orne, łąki i pastwiska, tereny zabudowane), rumowiska unoszonego oraz osadów dennych. Metale ciężkie oznaczono za pomocą Atomowej Spektroskopii Absorpcyjnej (ASA). W badanych próbkach zaobserwowano zmienność stężeń metali w zależności od sposobu użytkowania gruntów. Otrzymane wyniki świadczą również, że główne zanieczyszczenie metaliczne w zlewni stanowią Zn i Cd. Wśród próbek rumowiska unoszonego oraz osadów dennych widoczne były pewne wahania sezonowe, które mogły być związane z działalnością rolniczą lub warunkami meteorologicznymi. Zastosowana do określania źródeł zawiesiny w zlewni metoda sediment fingerprints (test Kruskal-Wallis H test, p˂0.05), ) wykazała, że spośród badanych metali jedynie Mn i Ni nie umożliwiają rozróżnienia potencjalnych źródeł pochodzenia rumowiska unoszonego. Pozostałe metale zostały zatem wykorzystane do opisania zależności między rumowiskiem a 4 typami próbek gleb za pomocą modelu regresji wielokrotnej. Model ten wykazał związek zanieczyszczenia próbek rumowiska metalami z zanieczyszczeniem gleb z terenów zabudowanych. Biorąc pod uwagę zaobserwowany współczesny trend zmian w użytkowaniu gruntów, prowadzący do przekształcania obszarów rolniczych w obszary mieszkalne i usługowe, może on istotnie wpływać na zanieczyszczenie środowiska wodnego i jakość wody pitnej. Taka sytuacja jest znakiem ostrzegawczym ze względu na szybkie uprzemysłowienie, urbanizację i intensywną gospodarkę rolną w tym regionie.

Water management problems at the Bukówka drinking water reservoir’s cross-border basin area in terms of its established functions

Wiatkowski M., Rosik-Dulewska C.

Journal of Ecological Engineering

2015

Vol. 16, nr 2

52--60

The paper covers the analysis of water management problems in the cross-border reservoir basin of Bukówka, located at the Bóbr river, at 271+540 km of its course, below the Czech-Polish border, in Dolnośląskie Voivodeship. The problems of water management in the context of the reservoir’s functions have been analyzed; these are: flood control, the provision of water during low water level periods for the Water Treatment Plant in Marciszów, the provision of drinking water for the city of Wałbrzych as well as the provision of proper flow in the Bóbr river bed downstream from the reservoir. Due to its localization right below the border with the Czech Republic, the reservoir is exposed to a number of problems. The study has found that the main problems of water management in the basin area included unsatisfactory state of water and wastewater management in the basin, unsatisfactory state of the surface water quality in the basin area of the reservoir, poor condition of streams and drainage ditches, improper arrangement of arable lands and large downslopes and a lack of monitoring stations on tributaries of the reservoir. It has been found that the hydrochemical conditions in the Bukówka reservoir’s section are unfavorable for it. From the eutrophication point of view, the water flowing into the tank is characterized by a large content of nutrients, especially nitrates, phosphates and BOD5. In order to counteract eutrophication it is necessary to lower the concentration of nutrients in the water flowing into the tank. One of the basic ways to do so is to restore the water and wastewater management in the reservoir’s basin. Studies in the Bukówka reservoir provide important information concerning the state of the purity of the water supplying the reservoir. In order to obtain accurate information on the state of purity, a monitoring of hydrological and water quality should be continued. The studies are a part of the strategy of protection of the quality of transboundary waters, proposed in the Convention on the Protection and Use of Transboundary Watercourses and International Lakes of 1992.