Wigry Lake, located in North-Eastern (NE) Poland, has a century-old history of limnological explo... more Wigry Lake, located in North-Eastern (NE) Poland, has a century-old history of limnological exploration and is an excellent place to assess the impact of catchment changes caused by urbanization on the functioning of a large, polymictic, and flow-through lake. The history of prewar limnological research, the course of hydrochemical effects of urbanization in the river flowing into the lake since the 1970s, and long-term changes in the functioning of Wigry Lake are presented. The collected archival and current results indicate that the hydrochemical type of the lake’s waters remained the same, and the inflow of river waters from the urban catchment strongly transformed the lake bay receiving the load. In the remaining part of the lake, the eutrophication load caused smaller changes because of a gradual reduction in the inflow of nutrients. Consequently, there was an increase in vertical differentiation of oxygen, algal biomass, and their structure. A significant share of supplying th...
Fungi occur in almost all types of waters in the world and play an important role in many process... more Fungi occur in almost all types of waters in the world and play an important role in many processes in the environment, particularly in organic matter decomposition. During the last several decades, extensive knowledge was obtained on the ecology of aquatic fungi, but on fungal biomass in the water column less. The study was aimed at simultaneous determination of seasonal and spatial variability of aquatic fungi biomass in the river waters in relation to selected physicochemical water parameters and trophic state in the 27 lowland rivers of north-eastern Poland with length between 17 and 308 km and mean annual discharge 1 – 100 m3 s–1. The chemical and mycological evaluation was provided on the basis of 64 water samples taken in the July and October 2010. The chromatographic method of determination of seston ergosterol as a specific organic compound typical for the majority of fungi, was applied. Fungi biomass was higher in summer than in autumn. The particulate organic carbon (POC)...
Danube River as the second largest European river has not a detail study on total organic carbon ... more Danube River as the second largest European river has not a detail study on total organic carbon (TOC) biogeochemistry yet. Data from Transborder National Monitoring Network from years 2010-2012 were used to characterization of TOC concentrations and flux along a distance 2500 km, from Dillingen (Germany) up to Silistra (Romania/Bulgaria border) before Danube Delta. Although there are significant physiographic differences along the river course, a mean TOC concentrations slightly varied (2.5-4.5 mgCdm-3), with the highest variability in the Alpine section and before Black Gate Gorge where there are a mouths of major tributaries of Danube Rivers. In the middle and lower part of river course were detected a differences in TOC concentrations between the near bank zone and the central part of river flow, and a mean concentrations were highest in the each of northern river bank. Multiannual hydrological variations in the lower Danube River have a more significant impact on TOC differenti...
ABSTRACT Long-term studies were conducted on the polymictic Siemianówka reservoir (SR), situated ... more ABSTRACT Long-term studies were conducted on the polymictic Siemianówka reservoir (SR), situated in a seminatural forest-peat catchment in NE Poland. The studies were started on the second year of the reservoir's existence. The records showed dissolved organic carbon (DOC) concentrations gradually increasing up to 25…30 mg/L. The largest DOC pool in the reservoir comes from the spring load input, supplemented by the excessive development of phytoplankton with cyanobacteria dominance. The DOC limited the range of the photic zone, eliminated the occurrence of aquatic plants, and was a significant carrier of nutrients, which were gradually released to water, bringing about the “humoeutrophication” of the reservoir.Die Rolle des gelösten organisch gebundenen Kohlenstoffs in einem flachen Stausee des Tieflands — eine LangzeitstudieDurchgeführt wurden Langzeit-Untersuchungen am polymiktischen Stausee von Siemianówka, gelegen in einem halbnatürlichen Einzugsgebiet von Wald und Moor des Narew. Die Untersuchungen wurden im zweiten Jahr nach Anstau begonnen. Die DOC-Konzentrationen steigen fortschreitend an bis zu 25…30 mg/L. Der größte Anteil des DOC im Stausee stammt aus dem Frühjahrszufluss des Narew, ergnzt aus der exzessiven Entwicklung des Phytoplanktons mit Dominanz der Cyanobakterien. Der DOC-Gehalt begrenzt die Tiefe der euphotischen Zone, eliminiert das Vorkommen aquatischer Makrophyten und ist signifikanter Trger von Nhrstoffen, die allmhlich an das Wasser abgegeben werden. Insgesamt führt der DOC damit zur „Humoeutrophierung” des Stausees.
The impact of nutrients and turbidity on the grazer–periphyton interactions was investigated mont... more The impact of nutrients and turbidity on the grazer–periphyton interactions was investigated monthly at ten sites along the Nišava River (Balkan Peninsula). Based on the grazers densities, the studied sites were divided into three groups. There was significant difference in average grazer density between these three groups of sites. Our study revealed that the negative effect exerted by grazers on periphyton was statistically significant only at the localities of the site group II, characterized by the highest density of scraper assemblages. The results of SIMPER analysis revealed that the grazer assemblage of the site group II was mostly determined by Stagnicola palustris. We found that more diverse assemblages decrease the negative impact of grazers on periphyton biomass. The responses of grazing pressure were not influenced by river order, nor sensitive to season. Our findings show that the high levels of total nitrogen, and to a lesser extent of total phosphorus, led to the decr...
Long-term studies were conducted on the polymictic Siemianówka reservoir (SR), situated in a semi... more Long-term studies were conducted on the polymictic Siemianówka reservoir (SR), situated in a seminatural forest-peat catchment in NE Poland. The studies were started on the second year of the reservoir's existence. The records showed dissolved organic carbon (DOC) concentrations gradually increasing up to 25…30 mg/L. The largest DOC pool in the reservoir comes from the spring load input, supplemented by the excessive development of phytoplankton with cyanobacteria dominance. The DOC limited the range of the photic zone, eliminated the occurrence of aquatic plants, and was a significant carrier of nutrients, which were gradually released to water, bringing about the “humoeutrophication” of the reservoir.Die Rolle des gelösten organisch gebundenen Kohlenstoffs in einem flachen Stausee des Tieflands — eine LangzeitstudieDurchgeführt wurden Langzeit-Untersuchungen am polymiktischen Stausee von Siemianówka, gelegen in einem halbnatürlichen Einzugsgebiet von Wald und Moor des Narew. D...
Wigry Lake, located in North-Eastern (NE) Poland, has a century-old history of limnological explo... more Wigry Lake, located in North-Eastern (NE) Poland, has a century-old history of limnological exploration and is an excellent place to assess the impact of catchment changes caused by urbanization on the functioning of a large, polymictic, and flow-through lake. The history of prewar limnological research, the course of hydrochemical effects of urbanization in the river flowing into the lake since the 1970s, and long-term changes in the functioning of Wigry Lake are presented. The collected archival and current results indicate that the hydrochemical type of the lake’s waters remained the same, and the inflow of river waters from the urban catchment strongly transformed the lake bay receiving the load. In the remaining part of the lake, the eutrophication load caused smaller changes because of a gradual reduction in the inflow of nutrients. Consequently, there was an increase in vertical differentiation of oxygen, algal biomass, and their structure. A significant share of supplying th...
Fungi occur in almost all types of waters in the world and play an important role in many process... more Fungi occur in almost all types of waters in the world and play an important role in many processes in the environment, particularly in organic matter decomposition. During the last several decades, extensive knowledge was obtained on the ecology of aquatic fungi, but on fungal biomass in the water column less. The study was aimed at simultaneous determination of seasonal and spatial variability of aquatic fungi biomass in the river waters in relation to selected physicochemical water parameters and trophic state in the 27 lowland rivers of north-eastern Poland with length between 17 and 308 km and mean annual discharge 1 – 100 m3 s–1. The chemical and mycological evaluation was provided on the basis of 64 water samples taken in the July and October 2010. The chromatographic method of determination of seston ergosterol as a specific organic compound typical for the majority of fungi, was applied. Fungi biomass was higher in summer than in autumn. The particulate organic carbon (POC)...
Danube River as the second largest European river has not a detail study on total organic carbon ... more Danube River as the second largest European river has not a detail study on total organic carbon (TOC) biogeochemistry yet. Data from Transborder National Monitoring Network from years 2010-2012 were used to characterization of TOC concentrations and flux along a distance 2500 km, from Dillingen (Germany) up to Silistra (Romania/Bulgaria border) before Danube Delta. Although there are significant physiographic differences along the river course, a mean TOC concentrations slightly varied (2.5-4.5 mgCdm-3), with the highest variability in the Alpine section and before Black Gate Gorge where there are a mouths of major tributaries of Danube Rivers. In the middle and lower part of river course were detected a differences in TOC concentrations between the near bank zone and the central part of river flow, and a mean concentrations were highest in the each of northern river bank. Multiannual hydrological variations in the lower Danube River have a more significant impact on TOC differenti...
ABSTRACT Long-term studies were conducted on the polymictic Siemianówka reservoir (SR), situated ... more ABSTRACT Long-term studies were conducted on the polymictic Siemianówka reservoir (SR), situated in a seminatural forest-peat catchment in NE Poland. The studies were started on the second year of the reservoir's existence. The records showed dissolved organic carbon (DOC) concentrations gradually increasing up to 25…30 mg/L. The largest DOC pool in the reservoir comes from the spring load input, supplemented by the excessive development of phytoplankton with cyanobacteria dominance. The DOC limited the range of the photic zone, eliminated the occurrence of aquatic plants, and was a significant carrier of nutrients, which were gradually released to water, bringing about the “humoeutrophication” of the reservoir.Die Rolle des gelösten organisch gebundenen Kohlenstoffs in einem flachen Stausee des Tieflands — eine LangzeitstudieDurchgeführt wurden Langzeit-Untersuchungen am polymiktischen Stausee von Siemianówka, gelegen in einem halbnatürlichen Einzugsgebiet von Wald und Moor des Narew. Die Untersuchungen wurden im zweiten Jahr nach Anstau begonnen. Die DOC-Konzentrationen steigen fortschreitend an bis zu 25…30 mg/L. Der größte Anteil des DOC im Stausee stammt aus dem Frühjahrszufluss des Narew, ergnzt aus der exzessiven Entwicklung des Phytoplanktons mit Dominanz der Cyanobakterien. Der DOC-Gehalt begrenzt die Tiefe der euphotischen Zone, eliminiert das Vorkommen aquatischer Makrophyten und ist signifikanter Trger von Nhrstoffen, die allmhlich an das Wasser abgegeben werden. Insgesamt führt der DOC damit zur „Humoeutrophierung” des Stausees.
The impact of nutrients and turbidity on the grazer–periphyton interactions was investigated mont... more The impact of nutrients and turbidity on the grazer–periphyton interactions was investigated monthly at ten sites along the Nišava River (Balkan Peninsula). Based on the grazers densities, the studied sites were divided into three groups. There was significant difference in average grazer density between these three groups of sites. Our study revealed that the negative effect exerted by grazers on periphyton was statistically significant only at the localities of the site group II, characterized by the highest density of scraper assemblages. The results of SIMPER analysis revealed that the grazer assemblage of the site group II was mostly determined by Stagnicola palustris. We found that more diverse assemblages decrease the negative impact of grazers on periphyton biomass. The responses of grazing pressure were not influenced by river order, nor sensitive to season. Our findings show that the high levels of total nitrogen, and to a lesser extent of total phosphorus, led to the decr...
Long-term studies were conducted on the polymictic Siemianówka reservoir (SR), situated in a semi... more Long-term studies were conducted on the polymictic Siemianówka reservoir (SR), situated in a seminatural forest-peat catchment in NE Poland. The studies were started on the second year of the reservoir's existence. The records showed dissolved organic carbon (DOC) concentrations gradually increasing up to 25…30 mg/L. The largest DOC pool in the reservoir comes from the spring load input, supplemented by the excessive development of phytoplankton with cyanobacteria dominance. The DOC limited the range of the photic zone, eliminated the occurrence of aquatic plants, and was a significant carrier of nutrients, which were gradually released to water, bringing about the “humoeutrophication” of the reservoir.Die Rolle des gelösten organisch gebundenen Kohlenstoffs in einem flachen Stausee des Tieflands — eine LangzeitstudieDurchgeführt wurden Langzeit-Untersuchungen am polymiktischen Stausee von Siemianówka, gelegen in einem halbnatürlichen Einzugsgebiet von Wald und Moor des Narew. D...
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