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1

The biodiversity of psammon rotifers in Włocławek Reservoir

100%

Bielańska-Grajner I. , Poznańska M.

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tom Vol. 39, No.1

111-117

EN

In total 47 rotifer taxa were found in the psammon of Włocławek Reservoir; 36 at the site in Dobiegniewo and 38 at Dobrzyń. Five species were classified as psammobionts, 14 as psammophiles, and the remaining ones as psammoxens. Psammobionts and psammophiles were observed mostly in the psammon at Dobiegniewo. The highest density of psammon rotifers was noted in the euarenal zone of the flooded part of the reservoir. However, the highest density in the area near the swift current was noted in the hygroarenal zone. While the flooded part of the reservoir had four dominant species of rotifer: Lecane closterocerca, L. scutata, Lepadella patella and Cephalodella catellina, the area near the swift current had only two: Cephalodella catellina and Brachionus quadridentatus. The most favorable conditions for the development of psammon rotifers was in the flooded area of the reservoir. In comparison with other dam-reservoirs in Poland, the community of these rotifer types in the Włocławek Reservoir was characterized by considerable species richness.

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Long-term changes and spatial variability of mollusc communsities in selected habitats within the dam reservoir (Włocławek Reservoir, Vistula River, Central Poland)

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Jurkiewicz-Karnkowska E. , Żbikowski J.

Polish Journal of Ecology

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2004

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tom Vol. 52, nr 4

491-503

EN

The studies on long-term and spatial variability in dominance pattern and abundance of malacofauna in selected habitats of the Włocławek Reservoir (Central Poland) were made in relation to environmental factors. Abundant and relatively rich in species malacocenoses were dominated by Sphaerium corneum. Malacofauna of shallow biotopes was characterized by higher species richness and lower abundance than molluscs inhabiting the old river bed. Eutrophication, turbidity and transformation of bottom sediments are likely to be the most important factors influencing changes in malacocenoses.

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Influence of Sedimentary Fe and Mn on the Oxygenation of Overlying Waters in Dam Reservoirs

100%

Koszelnik P. , Bartoszek L.

Journal of Ecological Engineering

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2018

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tom Vol. 19, nr 5

180--185

EN

This paper reports the work to determine the impact that concentrations of manganese (Mn) and iron (Fe) in the bottom sediments of shallow dam reservoirs exert upon the dissolved oxygen concentrations of overlying waters. Specifically, the work was conducted in the period of 2013–2014 in six shallow artificial reservoirs located in SE Poland. The waters of all the reservoirs studied are relatively well oxygenated, though both supersaturation and anoxic conditions are observed seasonally across the 50–150% range. The reported reactions of bottom sediments were between pH 7.7 and 8.2, while the mean concentrations of Mn and Fe were found to vary widely from site to site (Mn from 0.068 to 1.48 g/kg d.w. and Fe from 2.48 to 24.0 g/kg d.w.). It was not possible to demonstrate any direct relationship between sediment Fe and Mn concentrations, the Mn/Fe ratio or pH on the one hand and the oxygenation of reservoir waters on the other. However, multiple regression analysis did allow for the identification of a significant influence of both Mn content and sediment pH on the oxygen concentration in reservoir waters. In simple terms, both an increase in Mn and a decrease in pH can be said to result in more fully aerobic conditions in waters.

4

A SPATIAL AND TEMPORAL ANALYSIS OF LAND USE CHANGES IN TWO MOUNTAIN VALLEYS: WITH AND WITHOUT DAM RESERVOIR (POLISH CARPATHIANS)

100%

Wiejaczka Ł. , Olędzki J. R. , Bucała-Hrabia A. , Kijowska-Strugała M.

Quaestiones Geographicae

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2017

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tom 36

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nr 1

129-137

EN

This study analyzed the temporal and spatial changes in land use taking place in two adjacent river valleys, located within the Polish Carpathians. The land use in 1977 and 2009 was presented for selected areas. In one of the valleys, a dam has been operating since 1994 along with a retention reservoir, which is an additional factor influencing the direction and scale of the land use changes. An analysis using GIS techniques showed that the general directions of transformation in both valleys in the land use structure are similar but with different intensity. In studied valleys a decrease of area with agricultural land and gradual increase in the forested area have been observed. In the valley with the reservoir few more changes were noticed. The decrease of the forested area by 5.5% and farmland by 8.2% on the areas submerged by reservoir was observed. The strip fields pattern has been changed into more dispersed. The road network development was also observed, as well as the change of nature of residential/agricultural buildings into residential/recreational.

5

Model of energy flow in the bottom sediments of littoral zone of a dam reservoir with regard to detritivorous roach, Rutilus rutilus (L.)

100%

Starzecka A. , Bednarz T. , Amirowicz A.

Polish Journal of Ecology

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1999

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tom Vol. 47, no 1

103-112

EN

Data obtained from April to October 1995 (196 days) were used for work out the model of energy flow through the bottom sediments of littoral zone of Dobczyce Reservoir (southern Poland) with special regard to algae, bacteria and roach, Rutilus rutilus (L.) - dominating species in ichthyofauna of this reservoir. In the surface layer (0.5 cm) of bottom sediments ash free organic matter (2061-5534 kJ m^-2), biomass algae (88-357 kJ m^-2) and bacteria (0.26-6.69 kJ m^-2), primary (19.3-83.8 kJ m^-2 24 h^-1) and secondary production (0.4-185.9 kJ m^-2 24 h^-1), and respiration of epibenthic communities (124-297 kJ m^-2 24 h^-1) werw determined. The density of roach (mean values 5.6 g m^-2) and their daily food ration (4.6-60.8 J m^-2 24 h^-1) were also appointed. The data showed that the participation of roach in the pool of energy taken awey beyond the bottom was very small and equalled 0.01% of total pool of energy (40118 kJ m^-2 196 days^-1) released.

6

Long-term changes in mollusc communities in shallow biotopes of a lowland reservoir (Zegrzyński Reservoir, central Poland)

100%

Jurkiewicz-Karnkowska E.

Polish Journal of Ecology

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1998

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tom Vol. 46, no 1

43-63

EN

Studies on species composition, dominance pattern and abundance of bottom molluscan fauna were conducted in 1980-1981 and 1995 in shallow biotopes of a lowland reservoir and mouth sections of inflowing rivers. In comparison with early 80-ties, number of mollusc species and species diversity decreased. Dominance of Viviparus viviparus and Dreissena polymorpha continued, whereas a share of Sphareiidae (except S. rivicola) in mollusc abundance decreased. After an increase in mollusc abundance observed till the end of 80-ties, a declining tendency was found(less distinct in the case of biomass). Progressive eutrophication of the reservoir is likely to be the main reason of the changes.

7

Mollusc communities in a humic dam reservoir (Siemianówka, eastern Poland) : diversity and abundance

100%

Jurkiewicz-Karnkowska E.

Polish Journal of Ecology

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1999

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tom Vol. 47, no 3

307-322

EN

Studies on macrozoobenthic communities of a young dam reservoir with particular reference to molluscs were conducted in the years 1996-98. Composition, dominance pattern and abundance of zoobenthic organisms were investigated in different shallow sites and the onse situated near the river course in the upper, middle, and lower parts of the reservoir. Bottom fauna was found to have low densities and biomass, and a fairly large number of taxa in comparison with other dam reservoirs. Although the reservoir has permanently been enriched with nutrients from the catchment area, macrozoobenthic communities are expected to level off at rather low abundance, because variety of factors can restrict their development.

8

Mściwojów Reservoir – study of a small retention reservoir with an innovative water self-purification system

100%

Dąbrowska J. , Kempa O. , Markowska J. , Sobota J.

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tom Vol. 15, nr 2

7--16

EN

The study presents the characteristics of the Mściwojów Reservoir equipped with a unique pre-reservoir structure that supports the process of self-purification of waters. The authors present more than ten years of studies, focusing mainly on the issues of water quality and the concentration of phosphorus, which is considered as the main factor influencing water eutrophication process. Quite a high concentration of phosphates was noted in the outflow from the main reservoir, in spite of a lower concentration of these compounds in the water leaving the pre-reservoir. Basing on the conducted analyses, the catchment of the reservoir was qualified as group 4, being very prone to the movement and supply of material to the reservoir. The negative value of the retention coefficient of phosphorus obtained for the main part of the reservoir points to the existence of an internal source of phosphorus supply to the reservoir. During over 10 years of studies, new directions of the development of the rural areas were determined. Future works should be extended so as to cover all elements of the ecosystem of the reservoir. In a longer term it seems natural to extend the research works to cover the whole catchment of Wierzbiak River.

9

The life strategy and dynamics of selected species of phyto- and zooplankton in a dam reservoir during "wet" and "dry" years

88%

Pociecha A. , Wilk-Woźniak E.

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tom Vol. 54, nr 1

29-38

EN

The investigation was carried out during "dry" and "wet" ( average: 478.6 mm and 624.7 mm respectively) years in the Dobczyce Reservoir, which is located in a foothills area of southern Poland. The Reservoir covers 985 ha, has a volume of 108 [x] 10^6 m^3, a mean depth of 11 m and an average flushing rate of 2.9 yr^-1. Statistical analysis (ANOVA) showed that "dry" and "wet" years differed markedly as regards hydrological variables (water flow and flushing ratio). Among the physico-chemical variables, it was the concentration of NH4-N that differed most in years of the different hydrological types. The main aim of the study was to check the life strategies and dynamics of selected species among the phyto- and zooplankton during the aforementioned "dry" and "wet" years. The assessment centered on changes in population densities for algal species of differing life strategies according to the Reynolds' classification, particularly S-species (Microcystis aeruginosa (Kutz.) Kutz., Woronichinia naegeliana (Unger) Elenkin., R-species (Asterionella formosa Hass, Cyclotella sp.) and C/S-species (Ceratium hirundinella O. F. Muller) Bergh, Cryptomonas sp.). C species like Chlorella, Rhodomonas and Stephanodiscus hantzschii Grun. (in Cl. & Grunow), which were present in only small numbers, were not taken into consideration. No algal species presented any statistical differences in average population density between the studied years. Factors correlated (Pearson correlation) with the density of algae were found to be: flow, flushing ratio, transparency, turbidity and NO3-N. Changes in the density of selected zooplankton species representing r-strategists (Bosmina longirostris (O. F. Muller, 1785), Brachionus angularis Gosse, 1851, Pompholyx sulcata Hudson, 1851) and K-strategists (Daphnia cucullata Sars,1862, Daphnia longispina O. F. Muller, 1785, Eudiaptomus gracilis (Sars,1863)) were also studied. The densities of Keratella cochlearis (Gosse, 1851) and Mesocyclops leuckart (Claus,1857) differed significantly between hydrological years. Physical environmental factors like flow, flushing ratio, transparency and turbidity were correlated with zooplankton density, as was shown by Pearson correlation coefficient. Our investigations did not confirm the hypothesis that R (phytoplankton) and r (zooplankton) species are favored by "wet" years, while species of types S (phytoplankton) and K (zooplankton) prefer the conditions present in .dry" years. Only the two zooplankton species characterized as different strategists (i.e. the r-selected Keratella cochlearis and K-selected Mesocyclops leuckarti) responded in significantly different ways to "wet" and "dry" years.

10

A comparison between the water quality of the main tributaries to three submontane dam reservoirs and the sediment quality in those reservoirs

88%

Szarek-Gwiazda E. , Mazurkiewicz-Boroń G.

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tom Vol. 39, No.3

55-63

EN

Nutrients, pH, and organic matter were determined in water samples collected from the Raba River above Dobczyce Reservoir (meso-eutrophic), from the Dunajec River above Czorsztyn Reservoir (mesotrophic), and Rożnów Reservoir (eutrophic), and in the bottom sediments of the reservoirs. The river waters were alkaline (pH 7.2–9.2). In the Raba River and Dunajec River, the ranges of nutrients and organic matter contents were similar (without significant differences) (in mg dm^-3; N-NO_3 0.5–2.5, N-NH_4 0.2–2.0, N-NO_2 0.004–0.040, N-tot 1.1–5.6, PO4 0.02–0.58, P-tot 0.03–1.9, while BOD5 1.6–9.9 mg dm-3 O2, COD 2.1–30.4 mg dm^-3 O_2). The pH of reservoir sediments was from neutral to slightly alkaline (6.9–7.6). The sediments were mineral and were characterized by a low amount of nutrients (N-tot 0.04–0.36%, P-tot 0.007–0.185%) and organic matter (expressed as LOI 3.0–10.6%, TOC 0.9–3.3%). Nutrient (except P-tot) and organic matter contents in the sediments of three reservoirs were similar (without significant differences) and did not reflect the trophic state of the reservoirs.

11

The sedimentation processes in Włocławek Reseryoir

88%

Bogucka M. , Magnuszewski A. , Szmajda D.

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tom 12

95-101

EN

The study discusses accumulation and erosion processes which occurred in the bowl of Włocławek Reservoir in the period 1971-1992, and were analysed using digital batimetric maps. It also provides the results of the work of other authors concerning the assessment of the river sediments accumulated in the reservoir. Analysis of digital batimetric maps has shown that the materiał deposited in Włocławek Reservoir in the years 1971-1992 totalled about 18.3 million m3, which corresponds to approximately 0.87 million m3 of sediments per annum, and means a 4.5% loss of the reservoir's storage capacity. The volume of accumulation and erosion, assessed in this manner, approximates the earlier calculations performed using different research methods; it corroborates the fact that accumulation prevails in the balance of the sediments.

12

Heavy metal contents in stone loach Noemacheilus barbatulus (L.) (Cobitidae) living in the river above and below dam reservoir (Dobczyce reservoir, southern Poland)

88%

Szarek-Gwiazda E.

Polish Journal of Ecology

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1999

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tom Vol. 47, no 2

145-152

EN

The concentrations of Cd, Pb, Cu, Cr, Zn and Fe in tissues (liver, ovaries and muscle) of stone loach Noemacheilus barbatulus (L.) living in the Raba River above and below Dobczyce dam reservoir (southern Poland) was determined. The contents of the heavy metals in fish varied in the studied dates and tissues. The highest concentrations of metals were usually determined in liver and the lowest ones in muscle. The lower concentrations of Cr, Cd and Pb were stated in the stone loach from the Raba River below the reservoir, so the Dobczyce Reservoir was sink for these metals. The concentrations of Cu, Zn and Fe in the fish tissues from the Raba River above and below the reservoir had the same level.

13

Seasonal and year-to-year variation of numbers of Chironomus plumosus L. and Tubificidae in a lowland reservoir : regularities, causes, mechanisms

88%

Kajak Z. , Prus P.

Polish Journal of Ecology

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2003

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tom Vol. 51, nr 3

339-351

EN

During 9 years of studies very regular Chironomus population dynamics was stated in a eutrophic, lowland dam reservoir. There were usually two peaks of the abundance: the higher one at spring (up to 80 thousands ind. m^-2) and the much lower in autumn. The duration of the spring Chironomus generation was about 3 weeks. The constant presence of young larvae during the summer did not result in the high total abundance of larvae, mainly due to the strong predation of fish and swallows on various stages of Chironomus. The smaller predators pressure in the spring (due to fish breeding) and in the autumn (due to lower temperatures) resulted in the mentioned two peaks. The spring peak abundance was positively correlated with the chlorophyll concentration in water (feeding resource for larvae) and negatively with the water flow. There was also negative correlation of the water flow and the chlorophyll concentration, as well as abundance of Chironomus and Tubificidae during the vegetation season (April-October). Tubificidae correlated strongly positively with the spring Chironomus numbers (with a month lag). The slight positive correlation of these benthic components abundance occurred for the whole vegetation season. Tubificidae occurred in generally high numbers up to 400 thousands m^-2, but various in different years, and with no regular changes during the season.

14

Study of dam sediment distribution using experimental area-reduction method Case study: Karun Dam

88%

Yusuf R. , Komariah A. , Kurniady D. A. , Mardiani M. , Jumintono J. , Falih K. T. , Kabanov O. V. , Aravindhan S. , Kadhim M. M.

Journal of Water and Land Development

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2022

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tom no. 54

116--120

EN

Dam construction is one of the measures that is inevitable in many cases and must be done to supply drinking water, agricultural uses and electricity generation. There are many challenges to a successful dam project, and the managers of each project must consider the appropriate solutions for them. One of the studies that is done in dam design is sedimentation in dam reservoirs. The experimental area-reduction method is a very common technique that obtains the sediment distribution in depth and longitudinal profile. This technique shows that sediment accumulation is not limited to the bottom reservoirs. Sediment accumulation in a reservoir is usually distributed below the top of the protection reservoir or normal water level. In this study, the distribution of sediment in the reservoir of Karun Dam after a period of 65 years has been done using the experimental area-reduction method. Elevation-volume and elevation-area curves of the dam reservoir are obtained after the useful life of the dam and sediment deposition. The results showed that after 65 years, 106.47·106 m3 of sediment is deposited in the reservoir of the dam and the useful volume of the reservoir is significantly reduced. Also, up to a height of 36.4 m, the dam reservoir is filled with sediment. Therefore, no valve should be placed up to this height.

15

The Quality Problems of the Dammed Water in the Mountain Forest Catchment

88%

Jachniak E. , Jaguś A. , Młyniuk A. , Nycz B.

Journal of Ecological Engineering

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2019

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tom Vol. 20, nr 5

165--171

EN

The research concerned the Wapienica dam reservoir, which is located in the Polish Carpathians, near the city of Bielsko-Biala. The dam closes the flow of water from the 11.1 km2 catchment. The forests cover about 90% of the catchment area, while the rest of the catchment constitutes grassland areas. The reservoir has a capacity of 1.05 million m3. The collected water is intended for supplying a water supply system. The catchment is treated as semi-natural, because within its borders the only works related to forest management are carried out. The aim of the research was evaluation of the water quality in this reservoir, including trophic status, based on the analyses carried out in 2015. It was found that the water was of good quality in basic physicochemical terms (e.g. suspension ≤13 mg∙dm-3,CODCr ≤11 mgO2∙dm-3, conductivity ≤82 µS∙cm-1, phosphates <0.05 mg∙dm-3, nitrates ≤5.1 mg∙dm-3, dissolved iron ≤0.12 mg∙dm-3). The contamination with heavy metals was not ascertained, with the exception of the zinc. The assessed sanitary indicators are worse – the bacteria of the Coli group and periodically also enterococci were observed in the reservoir water. The reservoir is not homogeneous in terms of biological production (the trophy degree). It is low in the upper part (oligotrophy generally) and increases in the part near the dam (mesotrophy, also eutrophy). The established presence of dangerous bacteria and symptoms of the reservoir eutrophication are disturbing in the context of the opinion on the purity of uninhabited mountain areas.

16

Catching waders at the Jeziorsko reservoir [Western Poland]

88%

Bargiel R. , Wlodarczyk R. , Kalinski A.

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1998

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tom 20

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nr 1-2

17

Succession of ichthyofauna in dam reservoirs of Poland

88%

Mastynski J.

Acta Hydrobiologica

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1997

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tom 39

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nr Suppl.1

18

Ringing of waders on the barrier-reservoirs of Silesia [South-Western Poland] in years 1978-1990

88%

Stawarczyk T.

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1998

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tom 20

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nr 1-2

19

Spatial distribution of zooplankton in a cascade system of Pomeranian dam reservoirs [Hajka, Rosnowo], Northern Poland

88%

Pociecha A. , Heese T.

Oceanological and Hydrobiological Studies

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2007

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tom 36

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nr 3

20

Reproductive pattern of Viviparus viviparus (Linnaeus 1758) (Gastropoda, Viviparidae) from littoral aggregations in a through-flow reservoir (Central Poland)

75%

Jakubik B.

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tom Vol. 54, nr 1

39-55

EN

Reproductive pattern of V. viviparus was studied in the years 1990-1994. The study was carried out in selected sites of the Zegrzyński Reservoir (Central Poland) and in outlet zones of its tributaries. Distinct prevalence of females over males was found. Sex ratio varied seasonally. In spring the percentage of females was the highest and decreased later on. In spring, reservoir sites were dominated by females of the III (12.1-25.0 mm width and 12.1-20.0 mm height ) and IV (25.1-35.0 mm width and 20.1-35.0 mm height) size classes and by males of the II (8.1-12.0 mm width and height) and III (12.1-25.0 mm width and 12.1-20.0 mm height ) size classes. In the outflow zones of rivers size distribution was similar. The lowest percentage of the I (shells of the young were < 8.0 mm long and had a hair cover characteristic for young snails) size class was noted in all sites for both sexes. Fertile females dominated in both habitats. In the reservoir their contribution ranged from 50 to 90% and was the highest in spring (c. 60-70%), still increased in summer (to c. 80-90%) and decreased in autumn to c. 50%. Mean number of embryos per female in the reservoir varied between 1.3 and 10.0 with the maximum recorded number of 35 embryos. In the outlet zones of rivers (where snail density was higher than in the reservoir) a higher percentage of fertile females (over 80%) was noted in both spring and summer. In autumn this percentage decreased to c. 60%. Mean number of embryos per female was also higher there than in the reservoir. It varied between 1.8 and 24.9 with the maximum number of 63 embryos per female. Higher numbers (mean and maximum) of embryos per female in the outlet zones persisted on all sampling occasions. Mean number of embryos increased with the shell size. The results suggest that reproductive pattern is the most influential factor affecting populations of Viviparus. This is mainly associated with the snails. viviparity which results in controlling reproduction, appearance of young all year round and parental care over juveniles.