During the growing season of the year 2012 and 2013 (April-November) hydrobiological and hydrochemical monitoring of newly created fi shponds inhered in Northern Moravia was carried out. Water temperature, dissolved oxygen content, pH, conductivity and water transparency were monitored directly at the sampling place. At the same time, water samples for taxonomical identifi cation of phytoplankton were taken. Chemical parameters stabilization occurred in the second year a er fl ooding. Chemism of fi shponds was infl uenced by higher ration of organic matter in fi shponds sediment and by fertilizing and liming. Water saturation by dissolved oxygen, pH, transparency and chlorophyll-a values fl uctuated in the wide range due the growth of planktonic communities and composition of the fi sh stock. Hydrochemical parameters stabilized in the second year a er the fi rst fl ooding. The phytoplanktonic community of fi shponds during the much of the growing season was formed by the representatives of green algae. Golden-brown algae were dominant during the spring season, in some cases euglenas as well. Diatoms were present in fi shponds from spring to autumn but only to limited degree. The cyanobacteria formed only minor part of phytoplanktonic community, except the fi shpond P1 where they formed dominant group.
The aim of the present study was to evaluate the influence of different human activities on water quality and benthos composition in the Ošetnice Stream that is located in the Western Carpathian Mountains. During the whole period of our monitoring, the high concentrations of dissolved oxygen and low content of organic matters were determined. Upstream part of the Ošetnice Stream is affected by long term building activities concerning railway tunnels and by the motorway along the stream that is in winter chemically treated to assure negotiability. Ski area situated close to the stream was used 110 days during the monitored period. Average daily visit was 590 persons. In winter, when road salting was used, concentrations of chlorides, sodium and calcium were noticeably increased in the stream tributaries which had an impact on monitored water parameters. Water quality assessment using macrozoobenthos and phytobenthos indices revealed the environmental state in a range from moderate to good. Decrease of salmonid community in the stream corresponds to start of road use in the year 2002. Salt applied in winter period to ensure road negotiability affected significantly water chemistry of the monitored stream. Deterioration of environmental conditions is mainly due to human activities; nevertheless self-cleaning ability of the stream is high and ensure a fast degradation of pollutants. Thus the biotic communities (except fish) of the Ošetnice Stream have to adapt to changes of the environment within the year.
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