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Number of results: 7
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Abstract

In the paper toxicity assessment of hospital wastewaters samples was performed using direct-contact

tests consisting of five species, which represent three different trophic levels of the food chain. IC50 or EC50 values were estimated for each tested organism: Pseudokirchneriella subcapitata IC50/72h 18.77%, Daphnia magna

EC50/48h 20.76%, Thamnocephalus platyurus EC50/24h 22.62%, Artemia salina EC50/24h 59.87% and Vibrio fisheri

EC50/15min 46.17%. Toxic potential of hospital wastewater was described using a system of wastewater toxicity

classification. The toxic units (TU) values estimated for each test indicate that hospital wastewaters are toxic

(Class III). The variable results of the tests’ sensitivity confirmed the need of application of microbiotests battery with organisms of different trophic levels.

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Authors and Affiliations

A. Zgórska
A. Arendarczyk
E. Grabińska-Sota
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Abstract

The present work focuses on problems connected with the location and sampling method for pecton (biofilm) in sewage treatment plants. We also discuss the amount and quantity of pecton necessary to compose a representative sample. Comparisons of other selected contamination indicators in place of pecton sampling, are also presented. Research carried out at the WWTP "Hajdow" demonstrated that everything (starting from grid chambers), coming into contact with sewage surfaces is covered with biofilm This biological formation does not cause any significant changes in sewage quality due to its relatively small surface compared to the sewage flux. As presented in the following analysis, pecton can be used for bioindication of sewage quality. This is possible because the organisms forming these communities use substances contained in flowing sewage as nutritional substrates. In such cases the wastewater purification level in biological sewage treatment plants can, in a way similar to rivers, be determined based on bioindication methods using existing similarities between the prevailing processes and organisms.
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Authors and Affiliations

Grzegorz Łagód
Henryk Sobczuk
ORCID: ORCID
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Abstract

There is a cascade of hydroelectric power plants built on the Váh River. From a water-management point of view, the natural channel is used to drain extreme discharges. During most of the year, discharges are regulated by water-management structures. These discharges are not used for energy-related purposes; therefore, it is important to determine the optimal discharge that will not negatively affect the ecosystem of the stream. The minimum balance discharge (hydro-ecological discharge) was determined based on the instream flow incremental methodology (IFIM) using the riverine habi-tat simulation system (RHABSIM). Input data were obtained from direct measurements on three reference reaches in the area between the cities Piešťany and Nové Mesto nad Váhom. Hydraulic flow characteristics were derived from three measurements at different water levels. Habitat quality was represented by ichthyofauna. Data to determine the habitat suit-ability curves of fish were obtained using a diving technique to collect video footage. The modelling resulted in the quanti-fication of the effect of discharge on ichthyofauna as a bio-indicator of habitat quality, which implied the need of 20 m3∙s–1 for a minimum balance discharge in summer.

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Authors and Affiliations

Zuzana Štefunková
Viliam Macura
Gréta Doláková
Martina Majorošová
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Abstract

In this article we investigate diatom assemblages in surface sediments of the subarctic Lake Imandra. We examine taxonomic composition and ecological structure and describe spatial variations of diatoms over the lake area. The diatom flora described here are characterized by abundance of planktonic centric species. The habitats of diatoms in the different stretches of Lake Imandra reflect local environmental conditions and are determined by the type and intensity of the anthropogenic impact. Stephanodiscus minutulus, S. alpinus, Aulacoseira islandica are the most abundant species in the area of the lake affected by industrial effluents and eutrophication, while Pantocsekiella comensis is most typical in the background sites of the lake. Diatoms’ taxonomic diversity is high in shallow bays where aquatic vegetation is common. Abundance of diatoms in areas affected by anthropogenic eutrophication reflects the high intensity of plankton primary production. Differences in the ecological structure of the diatom assemblages in different parts of Lake Imandra are caused by significant hydrochemical heterogeneity of the water quality.
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Authors and Affiliations

Sofia Vokueva
1
ORCID: ORCID
Dmitrii Denisov
1
ORCID: ORCID

  1. Institute of the North Industrial Ecology Problems, Federal Research Center “Kola Science Center of RAS”, 8a Akademgorodok Street, 184209, Apatity, Murmansk region, Russia
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Abstract

Zinc concentrations in apices [Zn 2+]apex of the lichens, Cladonia arbuscula and C. rangiferina were determined along transects through two sub-Arctic towns in the Usa River Basin, northeast European Russia. One transect, which was 130 km long running in an east-west direction, passed through the town of Vorkuta and the other transect, which was 240 km long running in a southwest-northeast direction, passed through Inta. Zinc accumulation in lichens, which was detected 25-40 km within the vicinity of Vorkuta, was largely attributed to local emissions of alkaline coal ash from coal combustion. The present results using C. arbuscula around Vorkuta are consistent with those of previous studies suggesting that this lichen is a useful bioindicator for trace metals. There was no such elevation of [Zn 2+]apex detected in C. rangiferina along the transect running through Inta.

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Authors and Affiliations

Tony R. Walker
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Abstract

There is a need for quality control of wastewater introduced into drainage systems. Physical and chemical analyses of wastewater inform only about the situation existing at the moment of sampling. The analysis based on bioindication methods allows to evaluate the existing state before sampling and so to recognize a drop of excessive loads or harmful substances for activated sludge. This refers to the moment preceding the sample taking at least by the generation time of the species with the lowest reproduction rate. For these reasons, the possibility of using microfauna representatives (feeding on organic pollutions) for bioindication was evaluated. The estimation was made of the usefulness of indicator species from the Kolkwitz-Marssori system, the Shannon-Wiener index based on species abundance and the latter based on abundances of morphological-functional organism groups. The study results showed that the ShannonWiener index calculated for morphological-functional groups (easiest to determine) was accurate enough for bioindication.
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Authors and Affiliations

Grzegorz Łagód
Jacek Malicki
Agnieszka Montusiewicz
Mariola Chomczyńska
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Abstract

The vitality of lichens and their growth depend on the physiological status of both the fungal and algal partner. Many epiphytic lichens demonstrate high specificity to a habitat type and hygrophilous species are, as a rule, confined to close-to-natural forest complexes. Tolerance to desiccation stress and the rate of photosynthesis activation upon thallus hydration vary between species. Analyzes of chlorophyll fluorescence and photosynthesis efficiency have been widely applied to determine the viability of lichens. The aim of this study was to determine the activation photosynthesis rate upon hydration in epiphytic lichens exposed to short-term desiccation stress and to find potential links between their activation pattern and ecological properties. The results proved that even highly sensitive hygrophilous lichens, i.e., Cetrelia cetrarioides, Lobaria pulmonaria, Menegazzia terebrata, do not exhibit any delay in the restart of the photosynthesis process, compared to mesophytic or xerophytic ones. All examined lichens achieved nearly 100% of their maximum photosynthetic efficiency just one hour after they had been supplied with a relatively small quantity of water. Moreover, the increase in photosynthesis efficiency, measured at 20-minute intervals upon hydration, started from a relatively high level. In addition, the differences in the content of photosynthetic pigments and water holding capacity between species did not affect the general pattern of activation, which is comparable across various lichens. It can be concluded that healthy hygrophilous lichens do not require long hydration time to regain a high level of photosynthesis efficiency after a short rainless period. This fact supports the idea of applying chlorophyll fluorescence analysis in the field to assess vitality of lichens and the condition of their natural habitat.
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Authors and Affiliations

Piotr Osyczka
1
ORCID: ORCID

  1. Institute of Botany, Faculty of Biology, Jagiellonian University, Gronostajowa 3, 30-387 Kraków, Poland

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