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Détails du magazine
Format
Magazine
eISSN
2300-7575
Première publication
17 Mar 2011
Période de publication
4 fois par an
Langues
Anglais

Chercher

Volume 18 (2018): Edition 4 (December 2018)

Détails du magazine
Format
Magazine
eISSN
2300-7575
Première publication
17 Mar 2011
Période de publication
4 fois par an
Langues
Anglais

Chercher

7 Articles
Accès libre

Models for calculating ice cover thickness on selected endorheic lakes of the upper Radunia (Kashubian Lakeland, northern Poland)

Publié en ligne: 25 Jan 2019
Pages: 129 - 135

Résumé

Abstract

The paper is an attempt to analyse whether there is or is not a relation between the thickness of ice covers that form on flow-through lakes under constant hydrometric supervision and on endorheic lakes not under constant hydrometric supervision. In order to do so, two benchmark lakes were selected – Raduńskie Górne and Ostrzyckie and six endorheic lakes: Kamionko, Kniewo, Stare Czaple, Zamkowisko, and Żuromino, including one seasonal outflow lake – Boruckie. Additionally, data on air temperature was also taken into consideration so as to determine the thermal characteristics of the analysed period. The data was obtained from the Limnological Station of Gdansk University, collected during patrol research carried out in the winter seasons of 2003–2008. In order to evaluate the formulas, additional measurements were made in 2016. The analysed lakes are located within the water catchment area of the upper Radunia in the central part of the Kashubian Lakeland. The benchmark lakes are located in the Radunia-Ostrzyce tunnel valley while the endorheic ones are located on the postglacial upland. The data analysis has revealed a strong relationship between the ice cover thickness on the benchmark lakes and the endorheic ones. Based on the analysis, models were developed for calculating ice thickness on the small endorheic lakes.

Mots clés

  • endorheic lake
  • ice thickness
  • trend analysis
Accès libre

Potential threat to Polish lakes and reservoirs from contamination by objects of environmental flood risk

Publié en ligne: 25 Jan 2019
Pages: 137 - 147

Résumé

Abstract

There is a potential threat to lakes and water reservoirs from contamination released due to the flooding of objects that can pose an environmental risk (cemeteries, sewage treatment plants, sewage pumping stations, landfills and industrial plants) located in areas prone to inundation. The analysis covered large lakes and reservoirs (those with the area of over 50 ha), identified as bodies of surface water located in areas potentially affected by flooding of high (10%), medium (1%) and low (0.2%) probability of occurrence. These areas are presented on flood hazard maps and flood risk maps. The results of analyses revealed that the scale of potential threat to Polish lakes, defined as bodies of surface water, with contamination from objects of environmental flood risk is marginal, however, in the case of reservoirs – significant.

Mots clés

  • lakes
  • water reservoirs
  • flood risk
  • body of surface water
Accès libre

Differences in the diet of breeding Cormorants Phalacrocorax carbo sinensis in an inland colony: the effect of years, breeding stages and locations within the colony

Publié en ligne: 25 Jan 2019
Pages: 149 - 156

Résumé

Abstract

A study of the diet of the Great Cormorant Phalacrocorax carbo sinensis (fish species and size) in (1) different seasons (years), (2) breeding stages (incubation and chick rearing), and (3) breeding areas (center and edge) in the colony in the Dzierżno-Duże Reservoir (southern Poland) was carried out. Overall, 147 pellets of the Great Cormorant were analysed. The low values of the indexes of Levin (Bi) and Shannon (H’) showed a limited trophic spectrum in the diet of the Great Cormorant. Roach (Rutilus rutilus) with a percentage index of relative importance (%IRI) of 62.89, perch (Perca fluviatilis) (%IRI = 22.63) and carp (Cyprinus carpio) (%IRI = 10.43), were the most common prey. Evident changes in the diet between 2003 and 2014, with less roach and more perch and ruffe in 2014 were found. They could be probably related to changes in the fish community. Differences in the food of cormorants between breeding stages reflected dietary requirements of the chicks. During the breeding season younger chicks require feeding with smaller fish than older chicks. The proportion of fish species found in the cormorant diet differed between the edge and the centre of the colony. We concluded that the impact of Great Cormorants on native fish assemblages may be dependent on the location within the colony, development state of the chicks and season, not just fish availability.

Mots clés

  • pellet analysis
  • food composition
  • fish size
  • daily food intake
Accès libre

Seasonal variations of plankton structure as bioindicators in Zayandehrud Dam Lake, Iran

Publié en ligne: 25 Jan 2019
Pages: 157 - 165

Résumé

Abstract

Zayandehrud Dam Lake located in Isfahan province is the largest lake in central Iran. In this study, the plankton communities including phytoplankton and zooplankton were studied as bioindicator organisms for assessment of water quality in the Zayandehrud Dam Lake. The water and phytoplankton organisms were collected from four stations at different seasons during 2014 by using a Nansen bottle sampler. The zooplankton samples were collected with a plankton net (mesh size = 50 µm). The phytoplankton community was composed of Bacillariophyceae, Cyanophyceae, Euglenophyceae, Dinophyceae and Chrysophyceae. The zooplankton community viz; Cladocera, Rotifera and Copepoda were found to have a density range of 13–155, 21–141 and 11–93 (ind. m−3), respectively. In general, phytoplankton and zooplankton communities, especially the presence of genera such as Cyclotella, Dynobrion, Bosmina and Daphnia (as indices of oligotrophic lakes) and also absence of Microsystis, Brachionus and Lecane are seen as important indices of eutrophic lakes. It could be concluded that the Zayandehrud Dam Lake can be classified as a healthy water body.

Mots clés

  • water quality
  • phytoplankton
  • zooplankton
Accès libre

Changes in the course of ice phenomena on Morskie Oko in the Tatra Mountains from 1963 to 2012 and the implications for tourism

Publié en ligne: 25 Jan 2019
Pages: 167 - 173

Résumé

Abstract

The article presents changes in the course of ice phenomena on Lake Morskie Oko over 50 years. It comprises detailed data of the course of the main parameters of ice regime of the lake in the years 1963–1970. Such a reference period yielded substantial differences in the obtained values of trends in comparison with the period 1971–2010, which is most common in literature. The trends obtained differed substantially from those describing the years 1971–2010, and the change in the parameters – scaled to a year of the analysed period – was about half the size. Attention was also drawn to the practical aspect of the changes in the duration and thickness of ice cover on the lake. In the years 1963–2012 the period of safe movement on the frozen lake was reduced by only 10 days.

Mots clés

  • Lake Morskie Oko
  • ice phenomena
  • climate change
  • tourism
Accès libre

Transformations in the water relations in the Wieczno Południowe lake catchment (Chełmno Lakeland, Poland)

Publié en ligne: 25 Jan 2019
Pages: 175 - 184

Résumé

Abstract

The research involved a detailed analysis of transformations in water relations in the Wieczno Południowe (Wieczno South) lake drainage basin in central Poland, in the physical geographical region of the Chełmno Lakeland. Significant changes were identified in the water relations in the catchment, which were caused by a number of anthropogenic factors. The most significant factors include land development works, changes in land use (a decrease in wetland area in favour of arable land), and the extraction of water from Lake Wieczno South (for irrigation purposes) and the creation of a weir construction on its outflow. It has been shown that in recent years the drainage basin’s water resources have been affected by climate fluctuations manifested as an increase in sums of evaporation. As a result of the deterioration of water relations in the catchment, the hydrological type of some lakes (Płużnica, Wieczno North and Wieczno South) have changed, which unexpectedly resulted in an improvement of their water quality. Taking into account the forecasts for further climate change, this factor will probably have a decisive influence on the water relations of the studied area in the coming years.

Mots clés

  • lakes
  • water resources
  • anthropopressure
  • climate change
Accès libre

Assessment of changes in the Viliya River runoff in the territory of Belarus

Publié en ligne: 25 Jan 2019
Pages: 185 - 196

Résumé

Abstract

The research results of runoff changes in the River Viliya at 3 stations (Steshitsy Village, Vileyka Town and Mihalishki village) during the period 1946–2014 for the average annual, maximum, minimum summer-autumn and winter runoff are presented. It has been concluded that heterogeneity in the time series of the river runoff is caused by natural-climatic and anthropogenic factors. At Mihalishki Village the average annual runoff is about 59.7 m3 s–1, the maximum 1570 m3 s–1, minimum summer–autumn is 22.0 m3 s–1, the minimum winter runoff is 17.3 m3 s–1, and the environmental runoff is 21.1 m3 s–1. A forecast of runoff changes for the River Viliya, depending on forecasted climate change using the “Atlas of Global and Regional Climate Projections” was made on the basis of four scenarios RCP8.5, RCP6.0, RCP4.5, RCP2.6. The results of research indicate that significant changes in runoff will not occur as the forecasted climatic parameters did not change significantly. A forecasted decrease in spring runoff was investigated, thus reducing the minimum runoff is not essential. In the event of possible low water periods the Vileyka reservoir resources, involving the Olkhovskoye and the Snigyanskoye water reservoirs, can be used for compensation measures, which may be considered as the most reliable backup source of industrial water supply for the Belarusian Nuclear Power Plant.

Mots clés

  • runoff
  • water supply
  • minimum
  • the Viliya River
  • Belarusian Nuclear Power Plant
7 Articles
Accès libre

Models for calculating ice cover thickness on selected endorheic lakes of the upper Radunia (Kashubian Lakeland, northern Poland)

Publié en ligne: 25 Jan 2019
Pages: 129 - 135

Résumé

Abstract

The paper is an attempt to analyse whether there is or is not a relation between the thickness of ice covers that form on flow-through lakes under constant hydrometric supervision and on endorheic lakes not under constant hydrometric supervision. In order to do so, two benchmark lakes were selected – Raduńskie Górne and Ostrzyckie and six endorheic lakes: Kamionko, Kniewo, Stare Czaple, Zamkowisko, and Żuromino, including one seasonal outflow lake – Boruckie. Additionally, data on air temperature was also taken into consideration so as to determine the thermal characteristics of the analysed period. The data was obtained from the Limnological Station of Gdansk University, collected during patrol research carried out in the winter seasons of 2003–2008. In order to evaluate the formulas, additional measurements were made in 2016. The analysed lakes are located within the water catchment area of the upper Radunia in the central part of the Kashubian Lakeland. The benchmark lakes are located in the Radunia-Ostrzyce tunnel valley while the endorheic ones are located on the postglacial upland. The data analysis has revealed a strong relationship between the ice cover thickness on the benchmark lakes and the endorheic ones. Based on the analysis, models were developed for calculating ice thickness on the small endorheic lakes.

Mots clés

  • endorheic lake
  • ice thickness
  • trend analysis
Accès libre

Potential threat to Polish lakes and reservoirs from contamination by objects of environmental flood risk

Publié en ligne: 25 Jan 2019
Pages: 137 - 147

Résumé

Abstract

There is a potential threat to lakes and water reservoirs from contamination released due to the flooding of objects that can pose an environmental risk (cemeteries, sewage treatment plants, sewage pumping stations, landfills and industrial plants) located in areas prone to inundation. The analysis covered large lakes and reservoirs (those with the area of over 50 ha), identified as bodies of surface water located in areas potentially affected by flooding of high (10%), medium (1%) and low (0.2%) probability of occurrence. These areas are presented on flood hazard maps and flood risk maps. The results of analyses revealed that the scale of potential threat to Polish lakes, defined as bodies of surface water, with contamination from objects of environmental flood risk is marginal, however, in the case of reservoirs – significant.

Mots clés

  • lakes
  • water reservoirs
  • flood risk
  • body of surface water
Accès libre

Differences in the diet of breeding Cormorants Phalacrocorax carbo sinensis in an inland colony: the effect of years, breeding stages and locations within the colony

Publié en ligne: 25 Jan 2019
Pages: 149 - 156

Résumé

Abstract

A study of the diet of the Great Cormorant Phalacrocorax carbo sinensis (fish species and size) in (1) different seasons (years), (2) breeding stages (incubation and chick rearing), and (3) breeding areas (center and edge) in the colony in the Dzierżno-Duże Reservoir (southern Poland) was carried out. Overall, 147 pellets of the Great Cormorant were analysed. The low values of the indexes of Levin (Bi) and Shannon (H’) showed a limited trophic spectrum in the diet of the Great Cormorant. Roach (Rutilus rutilus) with a percentage index of relative importance (%IRI) of 62.89, perch (Perca fluviatilis) (%IRI = 22.63) and carp (Cyprinus carpio) (%IRI = 10.43), were the most common prey. Evident changes in the diet between 2003 and 2014, with less roach and more perch and ruffe in 2014 were found. They could be probably related to changes in the fish community. Differences in the food of cormorants between breeding stages reflected dietary requirements of the chicks. During the breeding season younger chicks require feeding with smaller fish than older chicks. The proportion of fish species found in the cormorant diet differed between the edge and the centre of the colony. We concluded that the impact of Great Cormorants on native fish assemblages may be dependent on the location within the colony, development state of the chicks and season, not just fish availability.

Mots clés

  • pellet analysis
  • food composition
  • fish size
  • daily food intake
Accès libre

Seasonal variations of plankton structure as bioindicators in Zayandehrud Dam Lake, Iran

Publié en ligne: 25 Jan 2019
Pages: 157 - 165

Résumé

Abstract

Zayandehrud Dam Lake located in Isfahan province is the largest lake in central Iran. In this study, the plankton communities including phytoplankton and zooplankton were studied as bioindicator organisms for assessment of water quality in the Zayandehrud Dam Lake. The water and phytoplankton organisms were collected from four stations at different seasons during 2014 by using a Nansen bottle sampler. The zooplankton samples were collected with a plankton net (mesh size = 50 µm). The phytoplankton community was composed of Bacillariophyceae, Cyanophyceae, Euglenophyceae, Dinophyceae and Chrysophyceae. The zooplankton community viz; Cladocera, Rotifera and Copepoda were found to have a density range of 13–155, 21–141 and 11–93 (ind. m−3), respectively. In general, phytoplankton and zooplankton communities, especially the presence of genera such as Cyclotella, Dynobrion, Bosmina and Daphnia (as indices of oligotrophic lakes) and also absence of Microsystis, Brachionus and Lecane are seen as important indices of eutrophic lakes. It could be concluded that the Zayandehrud Dam Lake can be classified as a healthy water body.

Mots clés

  • water quality
  • phytoplankton
  • zooplankton
Accès libre

Changes in the course of ice phenomena on Morskie Oko in the Tatra Mountains from 1963 to 2012 and the implications for tourism

Publié en ligne: 25 Jan 2019
Pages: 167 - 173

Résumé

Abstract

The article presents changes in the course of ice phenomena on Lake Morskie Oko over 50 years. It comprises detailed data of the course of the main parameters of ice regime of the lake in the years 1963–1970. Such a reference period yielded substantial differences in the obtained values of trends in comparison with the period 1971–2010, which is most common in literature. The trends obtained differed substantially from those describing the years 1971–2010, and the change in the parameters – scaled to a year of the analysed period – was about half the size. Attention was also drawn to the practical aspect of the changes in the duration and thickness of ice cover on the lake. In the years 1963–2012 the period of safe movement on the frozen lake was reduced by only 10 days.

Mots clés

  • Lake Morskie Oko
  • ice phenomena
  • climate change
  • tourism
Accès libre

Transformations in the water relations in the Wieczno Południowe lake catchment (Chełmno Lakeland, Poland)

Publié en ligne: 25 Jan 2019
Pages: 175 - 184

Résumé

Abstract

The research involved a detailed analysis of transformations in water relations in the Wieczno Południowe (Wieczno South) lake drainage basin in central Poland, in the physical geographical region of the Chełmno Lakeland. Significant changes were identified in the water relations in the catchment, which were caused by a number of anthropogenic factors. The most significant factors include land development works, changes in land use (a decrease in wetland area in favour of arable land), and the extraction of water from Lake Wieczno South (for irrigation purposes) and the creation of a weir construction on its outflow. It has been shown that in recent years the drainage basin’s water resources have been affected by climate fluctuations manifested as an increase in sums of evaporation. As a result of the deterioration of water relations in the catchment, the hydrological type of some lakes (Płużnica, Wieczno North and Wieczno South) have changed, which unexpectedly resulted in an improvement of their water quality. Taking into account the forecasts for further climate change, this factor will probably have a decisive influence on the water relations of the studied area in the coming years.

Mots clés

  • lakes
  • water resources
  • anthropopressure
  • climate change
Accès libre

Assessment of changes in the Viliya River runoff in the territory of Belarus

Publié en ligne: 25 Jan 2019
Pages: 185 - 196

Résumé

Abstract

The research results of runoff changes in the River Viliya at 3 stations (Steshitsy Village, Vileyka Town and Mihalishki village) during the period 1946–2014 for the average annual, maximum, minimum summer-autumn and winter runoff are presented. It has been concluded that heterogeneity in the time series of the river runoff is caused by natural-climatic and anthropogenic factors. At Mihalishki Village the average annual runoff is about 59.7 m3 s–1, the maximum 1570 m3 s–1, minimum summer–autumn is 22.0 m3 s–1, the minimum winter runoff is 17.3 m3 s–1, and the environmental runoff is 21.1 m3 s–1. A forecast of runoff changes for the River Viliya, depending on forecasted climate change using the “Atlas of Global and Regional Climate Projections” was made on the basis of four scenarios RCP8.5, RCP6.0, RCP4.5, RCP2.6. The results of research indicate that significant changes in runoff will not occur as the forecasted climatic parameters did not change significantly. A forecasted decrease in spring runoff was investigated, thus reducing the minimum runoff is not essential. In the event of possible low water periods the Vileyka reservoir resources, involving the Olkhovskoye and the Snigyanskoye water reservoirs, can be used for compensation measures, which may be considered as the most reliable backup source of industrial water supply for the Belarusian Nuclear Power Plant.

Mots clés

  • runoff
  • water supply
  • minimum
  • the Viliya River
  • Belarusian Nuclear Power Plant

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