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Number of results: 5
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Abstract

This paper presents the impact of salinisation on the aquatic mollusc fauna in flooded mine subsidences in the Karvina region (Czech Republic). The results of the previous research on salinity in flooded mine subsidences show that some of them contain a high content of dissolved inorganic substances (above 1000 mg·l-1). These substances can affect the vegetation and animals occurring in the water and the surrounding area. The phylum of Mollusca was selected as a model group for the fieldwork as it includes species with the proven bioindication potential.

The occurrence of aquatic mollusc species was studied at 10 sites. The sites were selected based on the content of dissolved substances (the salinity gradient from <500 to >1000 mg·l-1. A total of 12 aquatic mollusc species were found, including one species identified as a potential bioindicator of the negative effect of salinisation on aquatic biota.

The analysis showed statistically significant positive correlations between the content of dissolved inorganic substances and the presence of alien species Potamopyrgus antipodarum (J.E. Gray, 1843). The gradient of salinity significantly affects the species composition of the mollusc fauna in flooded mine subsidences and may affect the biodiversity of this group.

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Authors and Affiliations

Kamila Kašovská
Łukasz Pierzchała
Edyta Sierka
Barbara Stalmachová
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Abstract

Ethnic return migration is a widespread strategy for migrants from economically disadvantaged coun-tries. This article is about those ethnic return migrants who might successfully migrate thanks to their ancestors; their decision is based upon economic, pragmatic or rationalistic incentives aside from their diasporic feeling of belonging. Although this phenomenon has already been studied, scholars still mostly refer only to the benefits proposed by immigration policy as a key to understanding it. The impact of policy in the country of emigration on ethnic return migration is understudied. This article fills this gap. I found that when the Soviet Union introduced an attractive policy for Ukrainians/Russians in terms of study or work opportunities and the inhabitants in the Ukrainian Soviet Republic were quick to proclaim themselves as Ukrainians or Russians, the dissolution of the Soviet Union quickly changed this motiva-tion. Ukrainians with Czech ancestors started to aim at obtaining official status as Czech members of the diaspora because of the benefits proposed by the Czech government (mainly permanent residency). However, it is difficult to prove the required link to one’s Czech ancestors due to Soviet-era documents in which the column with the Czech nationality of people’s ancestors is often missing. These observa-tions lead to the conclusion that an attractive immigration policy aimed at the diaspora should not be treated as the only comprehensive explanation for ethnic return migration. Ethnic policy in the country of emigration also shapes this kind of migration and – in this concrete case – could even discourage ethnic return migrants.

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Authors and Affiliations

Luděk Jirka
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Abstract

The ground source of drinking water for the village of Skalice nad Svitavou is located 35 km North of Brno (Czech Republic). An evaluation of developments in selected indicators of water quality in this groundwater source in the period 2013–2017 was the essence of this work. The data was provided by Vodárenská akciová společnost, a.s., i.e. the operator. At the same time, annual monitoring of water quality in the Úmoří stream, which flows through the catchment area and can affect the quality of groundwater, was carried out. Water samples were collected in 2017–2018 from 6 profiles on the Úmoří stream and its two tributaries. Raw water from the groundwater source does not meet the requirements for drinking water in some indicators and needs to be treated. Monitoring of surface water shows that the most problematic indicator is total phosphorus, the concentration of which exceeded limit values on all sampling profiles. The highest values were found in the tributaries, where total phosphorus concentrations exceeded 10 mg∙dm–3. There are 12 municipalities in the area of interest, only two of which have their own sewage treatment plant. It is clear from the results that wastewater in some municipalities is discharged directly into the recipient and is the cause of above-limit concentrations of both phosphorus and nitrogen. Intensively used agricultural land is another major source of pollution. Based on an analysis of sources of pollution, corrective measures have been proposed to improve the quality of surface and groundwater in the area.

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Authors and Affiliations

Petra Oppeltová
Jana Boráková
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Abstract

The article examines the language biographies of two generations of a family of German origin in the Czech Republic from the end of World War II to the present day. The content analysis of the biographies is based on the application of the narrative interview method developed in qualitative sociology. The analysis of the data obtained by this method follows the stages in the language use of the two informants in coping with the challenge of the language policies of the state.

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Authors and Affiliations

Ingrid Hudabiunigg
Robert Marchl
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Abstract

The article presents a reflection on the loss of historical and cultural heritage caused by the pursuit of energy efficiency reduction of buildings. The paper will present the post-war construction development in the Ostrava region, especially the completion of the railway network with the implementation of new railway stations. It is these stations, whose architecture refers to the success of the Czechoslovak Expo 58 pavilion in Brussels, that have faced increased interest in the last few years from conservators seeking to preserve these cultural assets for future generations. The author illustrates this with the example of the inappropriate reconstruction of the railway station in Havířov. The scientific method used is mainly the communication of the author’s own activist experience in saving the railway station from demolition and his own observations during the recent reconstruction of this object. The response to the activities of the Důl architektury association was very topical at the time and led to the production of a documentary by Czech Television titled Requiem for the Station (Hollander, 2015) from the series My Private War.
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Authors and Affiliations

Adam Guzdek
1

  1. Brno University of Technology, Faculty of Civil Engineering, Institute of Architecture

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